removed build error

AABB.cs

@@ -0,0 +1,41 @@
+using OpenTK.Mathematics;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Voxel
+{
+    public struct AABB
+    {
+        public Vector3 Min;
+        public Vector3 Max;
+
+        public AABB(Vector3 min, Vector3 max)
+        {
+            Min = min;
+            Max = max;
+        }
+
+        public static AABB FromCenter(Vector3 center, float width, float height, float depth)
+        {
+            Vector3 half = new Vector3(width / 2f, 0, depth / 2f);
+            return new AABB(center - half, center + new Vector3(half.X, height, half.Z));
+        }
+
+        public bool Intersects(AABB other)
+        {
+            return (Min.X <= other.Max.X && Max.X >= other.Min.X) &&
+                   (Min.Y <= other.Max.Y && Max.Y >= other.Min.Y) &&
+                   (Min.Z <= other.Max.Z && Max.Z >= other.Min.Z);
+        }
+
+        public bool Contains(Vector3 point)
+        {
+            return (point.X >= Min.X && point.X <= Max.X) &&
+                   (point.Y >= Min.Y && point.Y <= Max.Y) &&
+                   (point.Z >= Min.Z && point.Z <= Max.Z);
+        }
+    }
+}

BlockData.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Voxel
+{
+    public class BlockData
+    {
+    }
+}

Blocks.cs

@@ -0,0 +1,94 @@
+namespace Voxel
+{
+    public enum Blocks : byte
+    {
+        Air,
+        Stone,
+        Dirt,
+        OakPlanks,
+        Grass,
+        Bedrock,
+        Sand
+    }
+
+    public enum Orientation : byte
+    {
+        West = 0,  // + X
+        East = 1,  // - X
+        Top = 2,   // + Y
+        Bottom = 3,// - Y
+        North = 4, // + Z
+        South = 5, // - Z
+    }
+
+    public class BlockDefinition
+    {
+        public Blocks BlockType;
+        public Textures[] FaceTextures;
+
+        public BlockDefinition(Blocks type, Textures singleTexture)
+        {
+            BlockType = type;
+            FaceTextures = new Voxel.Textures[6];
+            for (int i = 0; i < 6; i++) FaceTextures[i] = singleTexture;
+        }
+
+        public BlockDefinition(
+            Blocks type,
+            Textures west,
+            Textures east,
+            Textures top,
+            Textures bottom,
+            Textures north,
+            Textures south
+        )
+        {
+            BlockType = type;
+            FaceTextures = new Textures[]
+            {
+                west, east, top, bottom, north, south
+            };
+        }
+    }
+
+    public static class BlockDefinitions
+    {
+        public static readonly Dictionary<Blocks, BlockDefinition> Blocks;
+
+        static BlockDefinitions()
+        {
+            Blocks = new Dictionary<Blocks, BlockDefinition>
+            {
+                {Voxel.Blocks.Stone, new BlockDefinition(
+                    Voxel.Blocks.Stone, Textures.Stone
+                )},
+
+                {Voxel.Blocks.Dirt, new BlockDefinition(
+                    Voxel.Blocks.Dirt, Textures.Dirt
+                )},
+
+                {Voxel.Blocks.OakPlanks, new BlockDefinition(
+                    Voxel.Blocks.OakPlanks, Textures.OakPlanks
+                )},
+
+                {Voxel.Blocks.Bedrock, new BlockDefinition(
+                    Voxel.Blocks.Bedrock, Textures.Bedrock
+                )},
+
+                {Voxel.Blocks.Sand, new BlockDefinition(
+                    Voxel.Blocks.Sand, Textures.Sand
+                )},
+
+                { Voxel.Blocks.Grass, new BlockDefinition(
+                    Voxel.Blocks.Grass,
+                    Voxel.Textures.GrassSide,  // West
+                    Voxel.Textures.GrassSide,  // East
+                    Voxel.Textures.GrassTop,   // Top
+                    Voxel.Textures.Dirt,       // Bottom
+                    Voxel.Textures.GrassSide,  // North
+                    Voxel.Textures.GrassSide   // South
+                )},
+            };
+        }
+    }
+}

Camera.cs

@@ -0,0 +1,71 @@
+using OpenTK.Mathematics;
+
+namespace Voxel
+{
+    static class Camera
+    {
+        public static Vector3 Position = new Vector3(-8, 16, -8);
+
+        public static float Pitch = -22.5f;
+        public static float Yaw = 0f;
+        public static float FOV = 60f;
+        public static float TargetFOV = FOV;
+        public static float FOVLerpSpeed = 10f;
+        public static float Speed = 5f;
+        public static float ShiftSpeed = 20f;
+
+        private static int _width;
+        private static int _height;
+
+        public static Matrix4 view =>
+            Matrix4.LookAt(Position, Position + Front, Vector3.UnitY);
+
+        public static Matrix4 projection;
+
+        public static Vector3 Front
+        {
+            get
+            {
+                float yawOffset = Yaw - 90f;
+                Vector3 front;
+                front.X = MathF.Cos(MathHelper.DegreesToRadians(yawOffset)) * MathF.Cos(MathHelper.DegreesToRadians(Pitch));
+                front.Y = MathF.Sin(MathHelper.DegreesToRadians(Pitch));
+                front.Z = MathF.Sin(MathHelper.DegreesToRadians(yawOffset)) * MathF.Cos(MathHelper.DegreesToRadians(Pitch));
+                return front.Normalized();
+            }
+        }
+
+        public static void UpdateMouse(Vector2 delta)
+        {
+            float sensitivity = 0.1f;
+            Yaw += delta.X * sensitivity;
+            Pitch -= delta.Y * sensitivity;
+
+            Pitch = MathHelper.Clamp(Pitch, -89f, 89f);
+        }
+
+        public static void UpdateProjection()
+        {
+            float fov = MathHelper.DegreesToRadians(FOV);
+            float aspectRatio = _width / (float)_height;
+            float near = 0.1f;
+            float far = 1000f;
+
+            projection = Matrix4.CreatePerspectiveFieldOfView(fov, aspectRatio, near, far);
+        }
+
+        public static void UpdateSize(int width, int height)
+        {
+            _width = width;
+            _height = height;
+            UpdateProjection();
+        }
+
+        public static void UpdateFOV(float deltaTime, float alpha)
+        {
+            float currentFOV = MathHelper.Lerp(FOV, TargetFOV, FOVLerpSpeed * deltaTime);
+            Camera.FOV = currentFOV;
+            Camera.UpdateProjection();
+        }
+    }
+}

Chunk.cs

@@ -0,0 +1,187 @@
+namespace Voxel
+{
+    public class Chunk
+    {
+        public static int Size = 16;
+        public static int Height = 256;
+        public readonly int X;
+        public readonly int Y;
+        private ChunkMesh _chunkMesh;
+
+        private Dictionary<ushort, BlockData> _blockData;
+        private Blocks[] _blocks;
+        public Dictionary<Orientation, Chunk> Neighbors = new();
+
+        public Chunk(int x, int y)
+        {
+            X = x;
+            Y = y;
+
+            _blockData = new Dictionary<ushort, BlockData>();
+            _blocks = new Blocks[Size * Size * Height];
+            _chunkMesh = new ChunkMesh(X, Y);
+
+            Initialize();
+        }
+
+        public void SetBlock(int x, int y, int z, Blocks block, bool updateMesh = true)
+        {
+            int i = GetBlockIndex(x, y, z);
+            if (i == -1) return;
+            _blocks[i] = block;
+
+            if (updateMesh)
+            {
+                UpdateChunkMesh();
+                Renderer.MarkBuffersDirty();
+            }
+        }
+
+        public void SetBlockIndex(int i, Blocks block)
+        {
+            _blocks[i] = block;
+        }
+
+        public Blocks GetBlock(int x, int y, int z)
+        {
+            int i = GetBlockIndex(x, y, z);
+            if (i == -1) return Blocks.Air;
+            return _blocks[i];
+        }
+
+        public BlockData GetBlockData(int x, int y, int z)
+        {
+            return new BlockData();
+        }
+
+        private void Initialize()
+        {
+            for (int x = 0; x < Size; x++)
+            {
+                for (int z = 0; z < Size; z++)
+                {
+                    var position = GetWorldCoordinates(x, 0, z);
+                    int height = Worldgen.GetHeight(position.x, position.z);
+
+                    for (int y = 0; y < 256; y++)
+                    {
+                        Blocks block = Worldgen.GetBlock(y, height);
+                        SetBlock(x, y, z, block, false);
+                    }
+                }
+            }
+            UpdateChunkMesh();
+        }
+
+        // todo
+        public (int x, int y, int z) IndexToPosition(int i)
+        {
+            int x = 0;
+            int y = 0;
+            int z = 0;
+
+            return (x, y, z);
+        }
+
+        public (int x, int y, int z) GetWorldCoordinates(int x, int y, int z)
+        {
+            x += (Size * X);
+            z += (Size * Y);
+            return (x, y, z);
+        }
+
+        private int GetBlockIndex(int x, int y, int z)
+        {
+            if (x < 0 || x > 15 || y < 0 || y > 255 || z < 0 || z > 15)
+                return -1;
+
+            return x + z * Size + y * Size * Size;
+        }
+
+        private static readonly (int dx, int dy, int dz)[] Offsets = new (int, int, int)[6]
+        {
+            ( 1,  0,  0), // +X
+            (-1,  0,  0), // -X
+            ( 0,  1,  0), // +Y
+            ( 0, -1,  0), // -Y
+            ( 0,  0,  1), // +Z
+            ( 0,  0, -1)  // -Z
+        };
+
+        public void UpdateChunkMesh()
+        {
+            List<FaceData> faces = new List<FaceData>(Size * Size * Height / 2);
+
+            for (int x = 0; x < Size; x++)
+            {
+                for (int z = 0; z < Size; z++)
+                {
+                    for (int y = 0; y < Height; y++)
+                    {
+                        for (byte face = 0; face < 6; face++)
+                        {
+                            int indexBase = y * Size * Size + z * Size + x;
+                            Blocks block = _blocks[indexBase];
+
+                            void AddFace()
+                            {
+                                FaceData faceData = new FaceData();
+
+                                faceData.Facing = (Orientation)face;
+                                faceData.Texture = BlockDefinitions.Blocks[block].FaceTextures[face];
+
+                                faceData.X = (byte)x;
+                                faceData.Y = (byte)y;
+                                faceData.Z = (byte)z;
+
+                                faces.Add(faceData);
+                            }
+
+                            if (block == Blocks.Air) continue; // ignore if air
+
+                            int nx = x + Offsets[face].dx;
+                            int ny = y + Offsets[face].dy;
+                            int nz = z + Offsets[face].dz;
+
+                            // check neighbor, ignore if at chunk edge
+
+                            int ni = GetBlockIndex(nx, ny, nz);
+                            if (GetBlockIndex(nx, ny, nz) == -1)
+                            {
+                                if (Neighbors.TryGetValue((Orientation)face, out Chunk neighbor) && neighbor != null)
+                                {
+                                    int localX = nx;
+                                    int localZ = nz;
+
+                                    if (nx < 0) localX = nx + Size;
+                                    if (nx >= Size) localX = nx - Size;
+
+                                    if (nz < 0) localZ = nz + Size;
+                                    if (nz >= Size) localZ = nz - Size;
+
+                                    Blocks neighborBlock = neighbor.GetBlock(localX, y, localZ);
+                                    if (neighborBlock != Blocks.Air)
+                                        continue;
+                                }
+                                AddFace();
+                                continue;
+                            }
+
+                            if (_blocks[ni] == Blocks.Air)
+                            {
+                                AddFace();
+                                continue;
+                            }
+                        }
+                    }
+                }
+            }
+            _chunkMesh.SetFaces(faces);
+        }
+
+        public ChunkMesh GetChunkMesh()
+        {
+            return _chunkMesh;
+        }
+    }
+}

ChunkMesh.cs

@@ -0,0 +1,44 @@
+using OpenTK.Graphics.OpenGL4;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Voxel
+{
+    public class ChunkMesh
+    {
+        public int X;
+        public int Y;
+        private byte[] _packedData;
+        public bool NeedsUpdate = false;
+        public int Size = 0;
+        private List<FaceData> _faces;
+
+        public ChunkMesh(int x, int y)
+        {
+            _packedData = new byte[0];
+            X = x;
+            Y = y;
+        }
+
+        public void SetFaces(List<FaceData> faces)
+        {
+            Size = faces.Count;
+            _faces = faces;
+            NeedsUpdate = true;
+        }
+
+        public byte[] GetPackedData()
+        {
+            if (NeedsUpdate)
+            {
+                _packedData = _faces.SelectMany(f => f.Pack()).ToArray();
+            }
+
+            return _packedData;
+        }
+    }
+}

Entity.cs

@@ -0,0 +1,449 @@
+using OpenTK.Mathematics;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Voxel
+{
+    public class Entity
+    {
+        public Vector3 Position;
+        public Vector3 Velocity;
+        public bool OnGround;
+        public float Rotation;
+
+        public float Width;
+        public float Height;
+
+        private float _gravity = 0.08f;
+        private float _terminalVelocity = -3.92f;
+        private float _airMultiplier = 0.91f;
+        private float _groundMultiplier = 0.6f;
+
+        private const float COLLISION_EPSILON = 0.01f;
+
+        protected World _world;
+
+        public Entity(Vector3 position, float width, float height, World world)
+        {
+            Position = position;
+            Width = width;
+            Height = height;
+            _world = world;
+        }
+
+        public void Tick()
+        {
+            Vector3 desiredMovement = Velocity;
+            Vector3 newPosition = Position;
+
+            CheckAndResolveCollisions(ref newPosition, desiredMovement);
+
+            Position = newPosition;
+
+            if (!OnGround)
+            {
+                Vector3 acceleration = new Vector3(0, -_gravity, 0);
+                Velocity += acceleration;
+                Velocity *= _airMultiplier;
+
+
+                if (Velocity.Y < _terminalVelocity)
+                {
+                    Velocity.Y = _terminalVelocity;
+                }
+            }
+            else
+            {
+                Velocity = new Vector3(Velocity.X * _groundMultiplier, 0f, Velocity.Z * _groundMultiplier);
+            }
+
+            UpdateOnGround();
+        }
+
+        public void CheckAndResolveCollisions(ref Vector3 position, Vector3 movement)
+        {
+            Vector3 originalPosition = position;
+
+            // Try full movement first
+            AABB futureBox = GetBoundingBoxAt(originalPosition + movement);
+
+            if (!HasCollision(futureBox))
+            {
+                // No collision, apply full movement
+                position = originalPosition + movement;
+                return;
+            }
+
+            // Collision detected, resolve each axis separately but independently
+            position = originalPosition;
+
+            // Resolve Y collision (always first for ground detection)
+            ResolveYCollisionIndependent(ref position, movement.Y);
+
+            // Resolve X and Z collisions independently of each other
+            Vector3 tempPosX = new Vector3(position.X + movement.X, position.Y, position.Z);
+            if (!HasCollision(GetBoundingBoxAt(tempPosX)))
+            {
+                position.X = tempPosX.X;
+            }
+            else
+            {
+                ResolveXCollisionIndependent(ref position, movement.X);
+            }
+
+            Vector3 tempPosZ = new Vector3(position.X, position.Y, position.Z + movement.Z);
+            if (!HasCollision(GetBoundingBoxAt(tempPosZ)))
+            {
+                position.Z = tempPosZ.Z;
+            }
+            else
+            {
+                ResolveZCollisionIndependent(ref position, movement.Z);
+            }
+        }
+
+        private void ResolveYCollisionIndependent(ref Vector3 position, float velocityY)
+        {
+            if (velocityY == 0) return;
+
+            Vector3 testPos = new Vector3(position.X, position.Y + velocityY, position.Z);
+            AABB testBox = GetBoundingBoxAt(testPos);
+
+            if (HasCollision(testBox))
+            {
+                if (velocityY > 0) // Hitting ceiling
+                {
+                    float ceilingY = GetCeilingHeight(testBox);
+                    position.Y = ceilingY - (Height / 2) - COLLISION_EPSILON;
+                    Velocity.Y = 0;
+                }
+                else // Hitting floor
+                {
+                    float floorY = GetFloorHeight(testBox);
+                    position.Y = floorY + (Height / 2) + COLLISION_EPSILON;
+                    Velocity.Y = 0;
+                    OnGround = true;
+                }
+            }
+            else
+            {
+                position.Y += velocityY;
+            }
+        }
+
+        private void ResolveXCollisionIndependent(ref Vector3 position, float velocityX)
+        {
+            if (velocityX == 0) return;
+
+            // Check if we're already inside a block at current position
+            AABB currentBox = GetBoundingBoxAt(new Vector3(position.X, position.Y, position.Z));
+            if (HasCollision(currentBox))
+            {
+                // Already inside a block, allow movement to escape
+                position.X += velocityX;
+                return;
+            }
+
+            float direction = Math.Sign(velocityX);
+            float checkDistance = Math.Abs(velocityX) + COLLISION_EPSILON;
+
+            for (float offset = 0; offset <= checkDistance; offset += 0.01f)
+            {
+                float testX = position.X + (offset * direction);
+                AABB testBox = GetBoundingBoxAt(new Vector3(testX, position.Y, position.Z));
+
+                if (HasCollision(testBox))
+                {
+                    if (direction > 0) // Moving right
+                    {
+                        position.X = GetRightWallPosition(testBox) - (Width / 2) - COLLISION_EPSILON;
+                    }
+                    else // Moving left
+                    {
+                        position.X = GetLeftWallPosition(testBox) + (Width / 2) + COLLISION_EPSILON;
+                    }
+                    Velocity.X = 0;
+                    return;
+                }
+            }
+
+            // No collision found, apply full movement
+            position.X += velocityX;
+        }
+
+        private void ResolveZCollisionIndependent(ref Vector3 position, float velocityZ)
+        {
+            if (velocityZ == 0) return;
+
+            // Check if we're already inside a block at current position
+            AABB currentBox = GetBoundingBoxAt(new Vector3(position.X, position.Y, position.Z));
+            if (HasCollision(currentBox))
+            {
+                // Already inside a block, allow movement to escape
+                position.Z += velocityZ;
+                return;
+            }
+
+            float direction = Math.Sign(velocityZ);
+            float checkDistance = Math.Abs(velocityZ) + COLLISION_EPSILON;
+
+            for (float offset = 0; offset <= checkDistance; offset += 0.01f)
+            {
+                float testZ = position.Z + (offset * direction);
+                AABB testBox = GetBoundingBoxAt(new Vector3(position.X, position.Y, testZ));
+
+                if (HasCollision(testBox))
+                {
+                    if (direction > 0) // Moving forward
+                    {
+                        position.Z = GetFrontWallPosition(testBox) - (Width / 2) - COLLISION_EPSILON;
+                    }
+                    else // Moving backward
+                    {
+                        position.Z = GetBackWallPosition(testBox) + (Width / 2) + COLLISION_EPSILON;
+                    }
+                    Velocity.Z = 0;
+                    return;
+                }
+            }
+
+            // No collision found, apply full movement
+            position.Z += velocityZ;
+        }
+
+        private float GetFloorHeight(AABB box)
+        {
+            int minX = (int)MathF.Floor(box.Min.X);
+            int maxX = (int)MathF.Floor(box.Max.X);
+            int minZ = (int)MathF.Floor(box.Min.Z);
+            int maxZ = (int)MathF.Floor(box.Max.Z);
+            int checkY = (int)MathF.Floor(box.Min.Y);
+
+            float highestFloor = float.MinValue;
+
+            for (int x = minX; x <= maxX; x++)
+            {
+                for (int z = minZ; z <= maxZ; z++)
+                {
+                    Blocks block = _world.GetBlock(x, checkY, z);
+                    if (block != Blocks.Air)
+                    {
+                        highestFloor = Math.Max(highestFloor, checkY + 1); // Top of the block
+                    }
+                }
+            }
+
+            return highestFloor != float.MinValue ? highestFloor : box.Min.Y;
+        }
+
+        private float GetCeilingHeight(AABB box)
+        {
+            int minX = (int)MathF.Floor(box.Min.X);
+            int maxX = (int)MathF.Floor(box.Max.X);
+            int minZ = (int)MathF.Floor(box.Min.Z);
+            int maxZ = (int)MathF.Floor(box.Max.Z);
+            int checkY = (int)MathF.Floor(box.Max.Y);
+
+            float lowestCeiling = float.MaxValue;
+
+            for (int x = minX; x <= maxX; x++)
+            {
+                for (int z = minZ; z <= maxZ; z++)
+                {
+                    Blocks block = _world.GetBlock(x, checkY, z);
+                    if (block != Blocks.Air)
+                    {
+                        lowestCeiling = Math.Min(lowestCeiling, checkY); // Bottom of the block
+                    }
+                }
+            }
+
+            return lowestCeiling != float.MaxValue ? lowestCeiling : box.Max.Y;
+        }
+
+        private float GetLeftWallPosition(AABB box)
+        {
+            int minY = (int)MathF.Floor(box.Min.Y);
+            int maxY = (int)MathF.Floor(box.Max.Y);
+            int minZ = (int)MathF.Floor(box.Min.Z);
+            int maxZ = (int)MathF.Floor(box.Max.Z);
+            int checkX = (int)MathF.Floor(box.Min.X);
+
+            float rightmostWall = float.MinValue;
+
+            for (int y = minY; y <= maxY; y++)
+            {
+                for (int z = minZ; z <= maxZ; z++)
+                {
+                    Blocks block = _world.GetBlock(checkX, y, z);
+                    if (block != Blocks.Air)
+                    {
+                        rightmostWall = Math.Max(rightmostWall, checkX + 1); // Right side of the block
+                    }
+                }
+            }
+
+            return rightmostWall != float.MinValue ? rightmostWall : box.Min.X;
+        }
+
+        private float GetRightWallPosition(AABB box)
+        {
+            int minY = (int)MathF.Floor(box.Min.Y);
+            int maxY = (int)MathF.Floor(box.Max.Y);
+            int minZ = (int)MathF.Floor(box.Min.Z);
+            int maxZ = (int)MathF.Floor(box.Max.Z);
+            int checkX = (int)MathF.Floor(box.Max.X);
+
+            float leftmostWall = float.MaxValue;
+
+            for (int y = minY; y <= maxY; y++)
+            {
+                for (int z = minZ; z <= maxZ; z++)
+                {
+                    Blocks block = _world.GetBlock(checkX, y, z);
+                    if (block != Blocks.Air)
+                    {
+                        leftmostWall = Math.Min(leftmostWall, checkX); // Left side of the block
+                    }
+                }
+            }
+
+            return leftmostWall != float.MaxValue ? leftmostWall : box.Max.X;
+        }
+
+        private float GetBackWallPosition(AABB box)
+        {
+            int minX = (int)MathF.Floor(box.Min.X);
+            int maxX = (int)MathF.Floor(box.Max.X);
+            int minY = (int)MathF.Floor(box.Min.Y);
+            int maxY = (int)MathF.Floor(box.Max.Y);
+            int checkZ = (int)MathF.Floor(box.Min.Z);
+
+            float frontmostWall = float.MinValue;
+
+            for (int x = minX; x <= maxX; x++)
+            {
+                for (int y = minY; y <= maxY; y++)
+                {
+                    Blocks block = _world.GetBlock(x, y, checkZ);
+                    if (block != Blocks.Air)
+                    {
+                        frontmostWall = Math.Max(frontmostWall, checkZ + 1); // Front side of the block
+                    }
+                }
+            }
+
+            return frontmostWall != float.MinValue ? frontmostWall : box.Min.Z;
+        }
+
+        private float GetFrontWallPosition(AABB box)
+        {
+            int minX = (int)MathF.Floor(box.Min.X);
+            int maxX = (int)MathF.Floor(box.Max.X);
+            int minY = (int)MathF.Floor(box.Min.Y);
+            int maxY = (int)MathF.Floor(box.Max.Y);
+            int checkZ = (int)MathF.Floor(box.Max.Z);
+
+            float backmostWall = float.MaxValue;
+
+            for (int x = minX; x <= maxX; x++)
+            {
+                for (int y = minY; y <= maxY; y++)
+                {
+                    Blocks block = _world.GetBlock(x, y, checkZ);
+                    if (block != Blocks.Air)
+                    {
+                        backmostWall = Math.Min(backmostWall, checkZ); // Back side of the block
+                    }
+                }
+            }
+
+            return backmostWall != float.MaxValue ? backmostWall : box.Max.Z;
+        }
+
+        public bool HasCollision(AABB box)
+        {
+            int minX = (int)MathF.Floor(box.Min.X);
+            int maxX = (int)MathF.Floor(box.Max.X);
+            int minY = (int)MathF.Floor(box.Min.Y);
+            int maxY = (int)MathF.Floor(box.Max.Y);
+            int minZ = (int)MathF.Floor(box.Min.Z);
+            int maxZ = (int)MathF.Floor(box.Max.Z);
+
+            for (int x = minX; x <= maxX; x++)
+            {
+                for (int y = minY; y <= maxY; y++)
+                {
+                    for (int z = minZ; z <= maxZ; z++)
+                    {
+                        Blocks block = _world.GetBlock(x, y, z);
+                        if (block != Blocks.Air)
+                        {
+                            return true;
+                        }
+                    }
+                }
+            }
+
+            return false;
+        }
+
+        public void ApplyImpulse(Vector3 force)
+        {
+            Velocity += force;
+        }
+
+        public AABB GetBoundingBox()
+        {
+            return GetBoundingBoxAt(Position);
+        }
+
+        public AABB GetBoundingBoxAt(Vector3 position)
+        {
+            float halfWidth = Width / 2;
+            float halfHeight = Height / 2;
+
+            Vector3 min = new Vector3(
+                position.X - halfWidth,
+                position.Y - halfHeight,  // Center Y minus half height
+                position.Z - halfWidth
+            );
+
+            Vector3 max = new Vector3(
+                position.X + halfWidth,
+                position.Y + halfHeight,  // Center Y plus half height
+                position.Z + halfWidth
+            );
+
+            return new AABB(min, max);
+        }
+
+        public void UpdateOnGround()
+        {
+            AABB box = GetBoundingBox();
+            float yCheck = box.Min.Y - 0.05f;
+
+            int minX = (int)MathF.Floor(box.Min.X);
+            int maxX = (int)MathF.Floor(box.Max.X);
+            int minZ = (int)MathF.Floor(box.Min.Z);
+            int maxZ = (int)MathF.Floor(box.Max.Z);
+
+            OnGround = false;
+            for (int x = minX; x <= maxX; x++)
+            {
+                for (int z = minZ; z <= maxZ; z++)
+                {
+                    Blocks block = _world.GetBlock(x, (int)MathF.Floor(yCheck), z);
+                    if (block != Blocks.Air)
+                    {
+                        OnGround = true;
+                        return;
+                    }
+                }
+            }
+        }
+    }
+}

FaceData.cs

@@ -0,0 +1,26 @@
+using System.Runtime.InteropServices;
+
+namespace Voxel
+{
+    public struct FaceData
+    {
+        public Orientation Facing;
+        public byte X, Y, Z;
+        public Textures Texture;
+        public byte LightLevel;
+
+        public byte[] Pack()
+        {
+            return new byte[]
+            {
+                X,
+                Y,
+                Z,
+                (byte)Facing,
+                (byte)Texture,
+                LightLevel,
+                0,0 // two bits empty
+            };
+        }
+    }
+}

Input.cs

@@ -0,0 +1,38 @@
+using OpenTK.Windowing.Common;
+using OpenTK.Windowing.GraphicsLibraryFramework;
+
+namespace Voxel
+{
+    public static class Input
+    {
+        private static Dictionary<Keys, bool> _keystates = new Dictionary<Keys, bool>();
+        private static Dictionary<MouseButton, bool> _mouseButtonStates = new Dictionary<MouseButton, bool>();
+
+        public static Action<MouseWheelEventArgs> OnMouseWheel;
+
+        public static bool GetMouseButton(MouseButton button)
+        {
+            return _mouseButtonStates.TryGetValue(button, out bool pressed) && pressed;
+        }
+
+        public static void SetMouseButton(MouseButton button, bool pressed)
+        {
+            _mouseButtonStates[button] = pressed;
+        }
+
+        public static bool GetKey(Keys key)
+        {
+            return _keystates.TryGetValue(key, out bool pressed) && pressed;
+        }
+
+        public static void SetKey(Keys key, bool pressed)
+        {
+            _keystates[key] = pressed;
+        }
+
+        public static void MouseWheel(MouseWheelEventArgs e)
+        {
+            OnMouseWheel.Invoke(e);
+        }
+    }
+}

Player.cs

@@ -0,0 +1,162 @@
+using OpenTK.Mathematics;
+using OpenTK.Windowing.Common;
+using OpenTK.Windowing.GraphicsLibraryFramework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Voxel
+{
+    public class Player : Entity
+    {
+        public double lastClick = 0;
+        public readonly float mouseCooldown = 0.2f;
+
+        private int _blockIndex = 0;
+        private double _tickTime = 0;
+
+        private Blocks _selectedBlock = Blocks.OakPlanks;
+        private Vector3 previousPosition;
+
+        public Player(Vector3 startPos, World world) : base(startPos, 0.5f, 1.8f, world)
+        {
+            Input.OnMouseWheel += SwitchBlock;
+        }
+
+        public void PlaceBlock()
+        {
+            var (success, hit, x, y, z, normal) = _world.Raycast(Camera.Position, Camera.Front.Normalized(), 8);
+            if (!success) return;
+
+            x += normal.X;
+            y += normal.Y;
+            z += normal.Z;
+
+            _world.SetBlock(x, y, z, _selectedBlock);
+        }
+
+        public void BreakBlock()
+        {
+            var (success, hit, x, y, z, normal) = _world.Raycast(Camera.Position, Camera.Front.Normalized(), 8);
+            if (!success) return;
+
+            _world.SetBlock(x, y, z, Blocks.Air);
+        }
+
+        public new void Tick()
+        {
+            previousPosition = Position;
+
+            float forwards = 0;
+            float sidewards = 0;
+
+            if (Input.GetKey(Keys.W))
+                forwards = -1;
+            if (Input.GetKey(Keys.S))
+                forwards = 1;
+            if (Input.GetKey(Keys.A))
+                sidewards = -1;
+            if (Input.GetKey(Keys.D))
+                sidewards = 1;
+
+            if (Input.GetKey(Keys.Space) && OnGround)
+            {
+                Console.WriteLine("Jump");
+                Velocity = new Vector3(Velocity.X, 0.42f, Velocity.Z);
+                OnGround = false;
+            }
+
+            if (Input.GetMouseButton(MouseButton.Right) && lastClick == 0)
+            {
+                lastClick = mouseCooldown;
+
+                PlaceBlock();
+            }
+
+            if (Input.GetMouseButton(MouseButton.Left) && lastClick == 0)
+            {
+                lastClick = mouseCooldown;
+
+                BreakBlock();
+            }
+
+            ApplyWalkSpeed(sidewards, forwards);
+            base.Tick();
+        }
+
+        public void Update(float deltaTime, float alpha)
+        {
+            Camera.Position = Vector3.Lerp(previousPosition, Position, alpha) + Vector3.UnitY * 0.62f;
+            Rotation = Camera.Yaw;
+
+            if (lastClick > 0)
+            {
+                lastClick -= deltaTime;
+                if (lastClick < 0) lastClick = 0;
+            }
+
+            if (!Input.GetMouseButton(MouseButton.Right) && !Input.GetMouseButton(MouseButton.Left))
+            {
+                lastClick = 0;
+            }
+        }
+
+        public void ApplyWalkSpeed(float x, float z)
+        {
+            Vector3 inputDir = new Vector3(x, 0, z);
+            if (inputDir.LengthSquared > 0)
+                inputDir = Vector3.Normalize(inputDir);
+
+            float yawRad = MathHelper.DegreesToRadians(Rotation);
+            float cos = MathF.Cos(yawRad);
+            float sin = MathF.Sin(yawRad);
+
+            Vector3 worldDir = new Vector3(
+                inputDir.X * cos - inputDir.Z * sin,
+                0,
+                inputDir.X * sin + inputDir.Z * cos
+            );
+
+            float M_t = 1.4f;
+            float groundMultiplier = 0.6f;
+
+            if (!OnGround)
+            {
+                Vector3 airAccel = worldDir * 0.02f * M_t;
+                Velocity = new Vector3(Velocity.X + airAccel.X, Velocity.Y, Velocity.Z + airAccel.Z);
+            }
+            else
+            {
+                Vector3 groundAccel = worldDir * 0.1f * M_t;
+                Velocity = new Vector3(Velocity.X * groundMultiplier + groundAccel.X,
+                              Velocity.Y,
+                              Velocity.Z * groundMultiplier + groundAccel.Z);
+            }
+        }
+
+        public void SwitchBlock(MouseWheelEventArgs e)
+        {
+            var keys = BlockDefinitions.Blocks.Keys.ToList();
+
+            bool inverted = false;
+            
+            if (e.OffsetY < 0)
+                inverted = true;
+
+            if (inverted)
+                if (_blockIndex == 0)
+                    _blockIndex = keys.Count -1;
+                else
+                    _blockIndex -= 1;
+            else
+                _blockIndex += 1;
+
+            _blockIndex = _blockIndex % keys.Count;
+            _selectedBlock = keys[_blockIndex];
+            Console.WriteLine(_selectedBlock);
+        }
+    }
+}

Program.cs

@@ -1,4 +1,5 @@
-using Voxel;
+using OpenTK.Mathematics;
+using Voxel;
 
 internal class Program
 {
@@ -8,7 +9,46 @@ internal class Program
         int sizeY = 600;
         string title = "Game";
 
+        World world = new World();
         Window window = new Window(sizeX, sizeY, title);
+
+        Console.WriteLine("Generating map...");
+
+        int worldSizeX = 8;
+        int worldSizeY = 8;
+
+        float maxI = worldSizeX * worldSizeY;
+        int i = 0;
+        int lastPercentage = 0;
+
+        for (int x = 0; x < worldSizeX; x++)
+        {
+            for (int y = 0; y < worldSizeY; y++)
+            {
+                i++;
+                Chunk chunk = new Chunk(x, y);
+                world.AddChunk(chunk);
+
+                int percentage = (int)((i / maxI) * 100);
+                if (percentage > lastPercentage)
+                {
+                    lastPercentage = percentage;
+                    Console.WriteLine((percentage).ToString() + "%");
+                }
+            }
+        }
+
+        Console.WriteLine("Generated " + maxI.ToString() + " chunks");
+
+        Renderer.SetWorld(world);
+
+        Vector3 startPos = new Vector3(15, 64, 15);
+        Player player = new Player(startPos, world);
+
+        window.Tick += player.Tick;
+        window.Update += player.Update;
+        window.Update += Camera.UpdateFOV;
+
         window.Run();
     }
 }

Renderer.cs

@@ -0,0 +1,136 @@
+using OpenTK.Graphics.OpenGL4;
+using OpenTK.Mathematics;
+using static System.Runtime.InteropServices.JavaScript.JSType;
+
+namespace Voxel
+{
+    static class Renderer
+    {
+        private static int _ssbo;
+        private static int _vao;
+        private static bool _buffersDirty;
+
+        private static Dictionary<(int, int), int> _chunkBufferSizes = new Dictionary<(int, int), int>();
+        private static Shader _shader;
+        private static readonly Texture _texture;
+        private static World? _world;
+
+        static Renderer()
+        {
+            string vertexPath = "Shaders/shader.vert";
+            string fragmentPath = "Shaders/shader.frag";
+            string texturePath = "atlas.png"; 
+
+            _shader = new Shader(vertexPath, fragmentPath);
+            _texture = new Texture(texturePath);
+
+            _shader.SetInt("uTexture", 0);
+
+            _ssbo = GL.GenBuffer();
+            _vao = GL.GenVertexArray();
+
+            GL.BindVertexArray(_vao);
+            GL.BindBuffer(BufferTarget.ShaderStorageBuffer, _ssbo);
+
+            GL.BufferData(BufferTarget.ShaderStorageBuffer, 1024 * 1024 * 128, IntPtr.Zero, BufferUsageHint.DynamicDraw);
+            GL.BindBufferBase(BufferRangeTarget.ShaderStorageBuffer, 0, _ssbo);
+        }
+
+        public static void Render()
+        {
+            GL.BindVertexArray(_vao);
+            GL.BindBuffer(BufferTarget.ShaderStorageBuffer, _ssbo);
+
+            _shader.Use();
+            _shader.SetMatrix4("view", Camera.view);
+            _shader.SetVector3("cameraPosition", Camera.Position);
+            _shader.SetMatrix4("projection", Camera.projection);
+
+            if (_buffersDirty)
+            {
+                UpdateAllChunksBuffer();
+                _buffersDirty = false;
+            }
+
+            RenderWorld();
+            RenderUi();
+        }
+
+        private static void UpdateAllChunksBuffer()
+        {
+            if (_world == null) return;
+
+            int offset = 0;
+            foreach (Chunk chunk in _world.GetAllChunks())
+            {
+                ChunkMesh chunkMesh = chunk.GetChunkMesh();
+
+                if (chunkMesh.NeedsUpdate)
+                {
+                    byte[] data = chunkMesh.GetPackedData();
+                    GL.BufferSubData(BufferTarget.ShaderStorageBuffer, (IntPtr)offset * 8, chunkMesh.Size * 8, data);
+                }
+
+                _chunkBufferSizes[(chunk.X, chunk.Y)] = offset;
+                offset += chunkMesh.Size * 8;
+            }
+        }
+
+        private static void RenderUi()
+        {
+            GL.Disable(EnableCap.DepthTest);
+            GL.Enable(EnableCap.Blend);
+            GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
+
+            //_uiShader.Use();
+
+            //Matrix4 projection = Matrix4.CreateOrthographicOffCenter(
+            //    0, screenWidth, screenHeight, 0, -1, 1);
+            //_uiShader.SetMatrix4("projection", projection);
+
+            // Bind UI texture atlas
+            //_uiTexture.Bind();
+
+            // Draw all UI sprites (batch by texture for efficiency)
+            //foreach (var sprite in _uiSprites)
+            //{
+            //sprite.Draw();
+            //}
+
+            // Restore 3D settings
+            GL.Disable(EnableCap.Blend);
+            GL.Enable(EnableCap.DepthTest);
+        }
+
+        private static void RenderWorld()
+        {
+            if (_world == null) return;
+
+            foreach (Chunk chunk in _world.GetAllChunks())
+            {
+                ChunkMesh chunkMesh = chunk.GetChunkMesh();
+
+                if (chunkMesh.Size == 0) continue;
+
+                if (!_chunkBufferSizes.TryGetValue((chunk.X, chunk.Y), out int offset)) continue;
+
+                _shader.SetInt("chunkX", chunk.X);
+                _shader.SetInt("chunkY", chunk.Y);
+
+                //GL.MemoryBarrier(MemoryBarrierFlags.ShaderStorageBarrierBit);
+                GL.DrawArrays(PrimitiveType.Triangles, offset * 6, chunkMesh.Size * 6);
+            }
+        }
+
+        public static void SetWorld(World world)
+        {
+            _world = world;
+            _buffersDirty = true;
+        }
+
+        public static void MarkBuffersDirty()
+        {
+            _buffersDirty = true;
+        }
+    }
+}

Shader.cs

@@ -1,16 +1,11 @@
 using OpenTK.Graphics.OpenGL4;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Reflection.Metadata;
-using System.Text;
-using System.Threading.Tasks;
+using OpenTK.Mathematics;
 
 namespace Voxel
 {
     public class Shader
     {
-        int handle;
+        private int _handle;
         private bool disposedValue = false;
 
         public Shader(string vertexPath, string fragmentPath)
@@ -41,36 +36,69 @@ namespace Voxel
 
             // attach
 
-            handle = GL.CreateProgram();
+            _handle = GL.CreateProgram();
 
-            GL.AttachShader(handle, vertexShader);
-            GL.AttachShader(handle, fragmentShader);
+            GL.AttachShader(_handle, vertexShader);
+            GL.AttachShader(_handle, fragmentShader);
 
-            GL.LinkProgram(handle);
+            GL.LinkProgram(_handle);
 
-            GL.GetProgram(handle, GetProgramParameterName.LinkStatus, out success);
+            GL.GetProgram(_handle, GetProgramParameterName.LinkStatus, out success);
             if (success == 0)
             {
-                string infoLog = GL.GetProgramInfoLog(handle);
+                string infoLog = GL.GetProgramInfoLog(_handle);
                 Console.WriteLine(infoLog);
             }
 
-            GL.DetachShader(handle, vertexShader);
-            GL.DetachShader(handle, fragmentShader);
+            GL.DetachShader(_handle, vertexShader);
+            GL.DetachShader(_handle, fragmentShader);
             GL.DeleteShader(fragmentShader);
             GL.DeleteShader(vertexShader);
         }
 
+        public void SetMatrix4(string name, Matrix4 matrix)
+        {
+            int location = GL.GetUniformLocation(_handle, name);
+            if (location == -1)
+            {
+                Console.WriteLine($"Uniform '{name}' not found in shader.");
+                return;
+            }
+            GL.UniformMatrix4(location, false, ref matrix);
+        }
+
+        public void SetVector3(string name, Vector3 vector3)
+        {
+            int location = GL.GetUniformLocation(_handle, name);
+            if (location == -1)
+            {
+                Console.WriteLine($"Uniform '{name}' not found in shader.");
+                return;
+            }
+            GL.Uniform3(location, ref vector3);
+        }
+
+        public void SetInt(string name, int value)
+        {
+            int location = GL.GetUniformLocation(_handle, name);
+            if (location == -1)
+            {
+                Console.WriteLine($"Uniform '{name}' not found in shader.");
+                return;
+            }
+            GL.Uniform1(location, value);
+        }
+
         public void Use()
         {
-            GL.UseProgram(handle);
+            GL.UseProgram(_handle);
         }
 
         protected virtual void Dispose(bool disposing)
         {
             if (!disposedValue)
             {
-                GL.DeleteProgram(handle);
+                GL.DeleteProgram(_handle);
 
                 disposedValue = true;
             }

Shaders/shader.frag

@@ -1,9 +1,25 @@
-#version 330 core
-out vec4 FragColor;
+#version 430 core
 
-in vec4 vertexColor;
+out vec4 FragColor;
+in vec2 fragUV;
+in vec3 fragPos;
+in float lighting;
+
+uniform sampler2D uTexture;
+uniform vec3 cameraPosition;
 
 void main()
 {
-    FragColor = vertexColor;
+    float fogEnd = 512;
+    float fogStart = 32;
+
+    float dist = length(cameraPosition - fragPos);
+    float fogFactor = (fogEnd - dist) / (fogEnd - fogStart);
+    fogFactor = clamp(fogFactor, 0, 1);
+
+    vec4 fogColor = vec4(0.8,0.8,0.8,1);
+    vec4 texColor = texture(uTexture, fragUV) * lighting;
+    vec4 color = mix(fogColor, texColor, fogFactor);
+
+    FragColor = vec4(color.rgb, texColor.a);
 }

Shaders/shader.vert

@@ -1,10 +1,117 @@
-#version 330 core
-layout (location = 0) in vec3 aPosition;
+#version 430 core
 
-out vec4 vertexColor;
+    struct FaceData {
+        uint x;
+        uint y;
+        uint z;
+        uint facing; // 0=+X,1=-X,2=+Y,3=-Y,4=+Z,5=-Z
+        uint texture;
+        uint lightLevel;
+    };
+
+    layout(std430, binding = 0) buffer FaceBuffer {
+        uint faces[];
+    };
+
+uniform mat4 view;
+uniform mat4 projection;
+uniform int chunkX;
+uniform int chunkY;
+
+out vec2 fragUV;
+out float lighting;
+out vec3 fragPos;
+
+const float lightMult[6] = float[6](0.6, 0.6, 1.0, 0.5, 0.8, 0.8);
+
+const vec3 offsets[6][6] = vec3[6][6](
+    vec3[6]( // +X
+        vec3(1, 0, 0),
+        vec3(1, 1, 1),
+        vec3(1, 0, 1),
+        vec3(1, 1, 1),
+        vec3(1, 0, 0),
+        vec3(1, 1, 0)
+    ),
+    vec3[6]( // -X
+        vec3(0, 0, 1),
+        vec3(0, 1, 0),
+        vec3(0, 0, 0),
+        vec3(0, 1, 0),
+        vec3(0, 0, 1),
+        vec3(0, 1, 1)
+    ),
+    vec3[6]( // +Y
+        vec3(0, 1, 0),
+        vec3(1, 1, 1),
+        vec3(1, 1, 0),
+        vec3(1, 1, 1),
+        vec3(0, 1, 0),
+        vec3(0, 1, 1)
+    ),
+    vec3[6]( // -Y
+        vec3(0, 0, 1),
+        vec3(1, 0, 0),
+        vec3(1, 0, 1),
+        vec3(1, 0, 0),
+        vec3(0, 0, 1),
+        vec3(0, 0, 0)
+    ),
+    vec3[6]( // +Z
+        vec3(1, 0, 1),
+        vec3(0, 1, 1),
+        vec3(0, 0, 1),
+        vec3(0, 1, 1),
+        vec3(1, 0, 1),
+        vec3(1, 1, 1)
+    ),
+    vec3[6]( // -Z
+        vec3(0, 0, 0),
+        vec3(1, 1, 0),
+        vec3(1, 0, 0),
+        vec3(1, 1, 0),
+        vec3(0, 0, 0),
+        vec3(0, 1, 0)
+    )
+);
+
+const vec2 uvs[6] = vec2[6](vec2(0,0), vec2(1,1), vec2(1,0), vec2(1,1), vec2(0,0), vec2(0,1));
 
 void main()
 {
-    gl_Position = vec4(aPosition, 1.0);
-    vertexColor = vec4(aPosition + vec3(0.5,0.5,0.5), 1.0);
+    uint faceIndex = gl_VertexID / 6u;
+    uint vertIndex = gl_VertexID % 6u;
+
+    uint start = faceIndex * 2u; // 2 byte per face
+     
+    uint u0 = faces[start]; // data in uint 0
+    uint u1 = faces[start + 1]; // data in uint 1
+
+    // extract values from bits
+    uint x = u0 & 0xFFu;
+    uint y = (u0 >> 8) & 0xFFu;
+    uint z = (u0 >> 16) & 0xFFu;
+    uint facing = (u0 >> 24) & 0xFFu;
+    uint texture = u1 & 0xFFu;
+    uint lightLevel = (u1 >> 8) & 0xFFu;
+
+    vec3 basePos = vec3(x + chunkX * 16, y, z + chunkY * 16);
+    vec4 worldPos = vec4(basePos + offsets[facing][vertIndex], 1.0);
+    float light = float(lightLevel) / 255.0; // use later for caves and stuff
+
+    // UV mapping
+    uint col = texture & 15u;      // texture % 16
+    uint row = texture >> 4;       // texture / 16
+    row = 15u - row;               // invert row so 0 is top
+
+    // convert to float after int math, divide by 16
+    vec2 uv = uvs[vertIndex] * 0.0625;
+    uv.x += float(col) * 0.0625;
+    uv.y += float(row) * 0.0625;
+
+    fragUV = uv;
+    lighting = lightMult[facing];
+
+    fragPos = vec3(worldPos.x, worldPos.y, worldPos.z);
+    gl_Position = projection * view * worldPos;
 }

Texture.cs

@@ -0,0 +1,43 @@
+using OpenTK.Graphics.OpenGL4;
+using StbImageSharp;
+
+namespace Voxel
+{
+    public class Texture
+    {
+        private int _handle;
+        private string _path;
+
+        public Texture(string path)
+        {
+            _handle = GL.GenTexture();
+            _path = path;
+
+            LoadFromFile();
+        }
+
+        private void LoadFromFile()
+        {
+            StbImage.stbi_set_flip_vertically_on_load(1);
+            ImageResult image = ImageResult.FromStream(File.OpenRead(_path), ColorComponents.RedGreenBlueAlpha);
+
+            GL.BindTexture(TextureTarget.Texture2D, _handle);
+            GL.TexImage2D(
+                TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba,
+                image.Width, image.Height, 0,
+                PixelFormat.Rgba, PixelType.UnsignedByte, image.Data
+            );
+
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
+        }
+
+        public void Bind(TextureUnit unit = TextureUnit.Texture0)
+        {
+            GL.ActiveTexture(unit);
+            GL.BindTexture(TextureTarget.Texture2D, _handle);
+        }
+    }
+}

Textures.cs

@@ -0,0 +1,44 @@
+namespace Voxel
+{
+    public enum Textures : uint
+    {
+        GrassTop,
+        Stone,
+        Dirt,
+        GrassSide,
+        OakPlanks,
+        SmoothStoneSlab,
+        SmoothStone,
+        Bricks,
+        TntSide,
+        TntTop,
+        TntBottom,
+        Cobweb,
+        Rose,
+        Dandelion,
+        Water,
+        OakSapling,
+        Cobblestone,
+        Bedrock,
+        Sand,
+        Gravel,
+        OakSide,
+        OakTop,
+        IronBlock,
+        GoldBlock,
+        DiamondBlock,
+        EmeraldBlock,
+        RedstoneBlock,
+        none0,
+        RedMushroom,
+        BrownMushroom,
+        JungleSapling,
+        none1,
+        GoldOre,
+        IronOre,
+        CoalOre,
+        Bookshelf,
+        MossyCobblestone,
+        Obsidian,
+    }
+}

Triangle.cs

@@ -1,48 +0,0 @@
-using OpenTK.Graphics.OpenGL4;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Voxel
-{
-
-    public class Triangle
-    {
-        private int _vao;
-        private Shader _shader;
-
-        public Triangle()
-        {
-            string vertexPath = "Shaders/shader.vert";
-            string fragmentPath = "Shaders/shader.frag";
-            _shader = new Shader(vertexPath, fragmentPath);
-
-            float[] vertices =
-            {
-                -0.5f, -0.5f, 0.0f, //top
-                0.5f, -0.5f, 0.0f, // bottom right
-                0.0f, 0.5f, 0.0f // bottom left
-            };
-
-            _vao = GL.GenVertexArray();
-            GL.BindVertexArray(_vao);
-
-            int vbo = GL.GenBuffer();
-            GL.BindBuffer(BufferTarget.ArrayBuffer, vbo);
-            GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * sizeof(float), vertices, BufferUsageHint.StaticDraw);
-
-            GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, 3 * sizeof(float), 0);
-            GL.EnableVertexAttribArray(0);
-
-            _shader.Use();
-        }
-
-        public void Draw()
-        {
-            GL.BindVertexArray(_vao);
-            GL.DrawArrays(PrimitiveType.Triangles, 0, 3);
-        }
-    }
-}

UISprite.cs

@@ -0,0 +1,17 @@
+using OpenTK.Mathematics;
+using System.Drawing;
+
+public class UISprite
+{
+    public Vector2 Position;  // Screen pixels (not normalized)
+    public Vector2 Size;      // Size in pixels
+    public Rectangle TextureRegion;  // Which part of atlas to use
+    public Color Tint = Color.White;
+    public float Rotation = 0f;
+    public Vector2 Origin = Vector2.Zero;  // Rotation/scale origin
+
+    public void Draw()
+    {
+        // Draw textured quad using TextureRegion coordinates
+    }
+}

Voxel.csproj

@@ -9,9 +9,13 @@
 
   <ItemGroup>
     <PackageReference Include="OpenTK" Version="4.9.4" />
+    <PackageReference Include="StbImageSharp" Version="2.30.15" />
   </ItemGroup>
 
   <ItemGroup>
+    <None Update="atlas.png">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
     <None Update="Shaders\shader.frag">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>

Window.cs

@@ -1,30 +1,70 @@
 using OpenTK.Graphics.OpenGL4;
 using OpenTK.Windowing.Common;
+using OpenTK.Windowing.Common.Input;
 using OpenTK.Windowing.Desktop;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
+using OpenTK.Windowing.GraphicsLibraryFramework;
 
 namespace Voxel
 {
-    public class Window(int width, int height, string title) : GameWindow(GameWindowSettings.Default, new NativeWindowSettings() { Size = (width, height), Title = title })
+    public class Window(int width, int height, string title) : GameWindow(GameWindowSettings.Default, new NativeWindowSettings() { ClientSize = (width, height), Title = title })
     {
-        private Triangle _triangle;
+        public readonly int Width = width;
+        public readonly int Height = height;
+        public uint frames = 0;
+        public double timeElapsed = 0;
 
-        protected override void OnUpdateFrame(FrameEventArgs args)
+        public event Action<float, float> Update;
+        public event Action Tick;
+
+        private double _tickTime;
+        public const double TICK_LENGTH = 1.0 / 20.0; // 20 TPS
+
+        protected override void OnUpdateFrame(FrameEventArgs e)
         {
-            base.OnUpdateFrame(args);
+            base.OnUpdateFrame(e);
+
+            _tickTime += e.Time;
+
+            while (_tickTime >= TICK_LENGTH)
+            {
+                _tickTime -= TICK_LENGTH;
+                Tick(); // run exactly once per tick
+            }
+
+            if (Input.GetKey(Keys.Escape))
+            {
+                Close();
+            }
+
+            if (Input.GetKey(Keys.F11))
+            {
+                if (!IsFullscreen)
+                    WindowState = WindowState.Fullscreen;
+                else
+                    WindowState = WindowState.Normal;
+            }
         }
 
-        protected override void OnRenderFrame(FrameEventArgs args)
+        protected override void OnRenderFrame(FrameEventArgs e)
         {
-            base.OnRenderFrame(args);
+            base.OnRenderFrame(e);
 
-            GL.Clear(ClearBufferMask.ColorBufferBit);
+            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
 
-            _triangle.Draw();
+            frames++;
+            timeElapsed += e.Time;
+            float alpha = (float)(_tickTime / Window.TICK_LENGTH);
+            float deltaTime = (float)e.Time;
+            if (timeElapsed >= 1)
+            {
+                Console.WriteLine("FPS: " + frames.ToString());
+                timeElapsed = 0;
+                frames = 0;
+            }
+
+            Update.Invoke(deltaTime, alpha);
+
+            Renderer.Render();
 
             SwapBuffers();
         }
@@ -33,6 +73,8 @@ namespace Voxel
         {
             base.OnFramebufferResize(e);
 
+            Camera.UpdateSize(e.Width, e.Height);
+
             GL.Viewport(0, 0, e.Width, e.Height);
         }
 
@@ -40,9 +82,54 @@ namespace Voxel
         {
             base.OnLoad();
 
-            _triangle = new Triangle();
+            GL.ClearColor(0.72f, 0.88f, 0.97f, 1f);
 
-            GL.ClearColor(0.5f, 0.5f, 0.5f, 1f);
+            GL.Enable(EnableCap.CullFace);
+            GL.Enable(EnableCap.DepthTest);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
+
+            CursorState = CursorState.Grabbed;
+            VSync = VSyncMode.On;
+
+            Camera.UpdateSize(Width, Height);
+        }
+
+        protected override void OnMouseMove(MouseMoveEventArgs e)
+        {
+            base.OnMouseMove(e);
+
+            Camera.UpdateMouse(e.Delta);
+        }
+
+        protected override void OnKeyUp(KeyboardKeyEventArgs e)
+        {
+            base.OnKeyUp(e);
+            Input.SetKey(e.Key, false);
+        }
+
+        protected override void OnKeyDown(KeyboardKeyEventArgs e)
+        {
+            base.OnKeyDown(e);
+            Input.SetKey(e.Key, true);
+        }
+
+        protected override void OnMouseDown(MouseButtonEventArgs e)
+        {
+            base.OnMouseDown(e);
+            Input.SetMouseButton(e.Button, true);
+        }
+
+        protected override void OnMouseUp(MouseButtonEventArgs e)
+        {
+            base.OnMouseUp(e);
+            Input.SetMouseButton(e.Button, false);
+        }
+
+        protected override void OnMouseWheel(MouseWheelEventArgs e)
+        {
+            base.OnMouseWheel(e);
+            Input.MouseWheel(e);
         }
     }
 }

World.cs

@@ -0,0 +1,185 @@
+using OpenTK.Mathematics;
+using System.Collections.Generic;
+using System.Drawing;
+
+namespace Voxel
+{
+    public class World
+    {
+        private Dictionary<(int, int), Chunk> _chunks;
+
+        public World()
+        {
+            _chunks = new Dictionary<(int, int), Chunk>();
+        }
+
+        public Chunk GetChunk(int chunkX, int chunkZ)
+        {
+            _chunks.TryGetValue((chunkX, chunkZ), out Chunk chunk);
+            return chunk;
+        }
+
+        public void AddChunk(Chunk chunk)
+        {
+            _chunks[(chunk.X, chunk.Y)] = chunk;
+
+            Dictionary<Orientation, Orientation> oppositeOrientation = new()
+            {
+                {Orientation.West, Orientation.East},
+                {Orientation.East, Orientation.West},
+                {Orientation.North, Orientation.South},
+                {Orientation.South, Orientation.North},
+            };
+
+            foreach (var (orientation, neighbor) in GetChunkNeighbors(chunk))
+            {
+                neighbor.Neighbors[oppositeOrientation[orientation]] = chunk;
+                chunk.Neighbors[orientation] = neighbor;
+                neighbor.UpdateChunkMesh();
+            }
+            chunk.UpdateChunkMesh();
+        }
+
+        public void RemoveChunk(int chunkX, int chunkZ)
+        {
+            _chunks.Remove((chunkX, chunkZ));
+        }
+
+        public IEnumerable<Chunk> GetAllChunks()
+        {
+            return _chunks.Values;
+        }
+
+        public Blocks GetBlock(int worldX, int worldY, int worldZ)
+        {
+            int chunkX = worldX / Chunk.Size;
+            int chunkZ = worldZ / Chunk.Size;
+            Chunk chunk = GetChunk(chunkX, chunkZ);
+            if (chunk == null) return 0; // air if chunk not loaded
+
+            int localX = worldX % Chunk.Size;
+            int localZ = worldZ % Chunk.Size;
+
+            return chunk.GetBlock(localX, worldY, localZ);
+        }
+
+        List<Orientation> GetEdgeOrientations(int localX, int localZ, int size)
+        {
+            var orientations = new List<Orientation>();
+
+            if (localX == size - 1) orientations.Add(Orientation.West);
+            if (localX == 0) orientations.Add(Orientation.East);
+            if (localZ == size - 1) orientations.Add(Orientation.North);
+            if (localZ == 0) orientations.Add(Orientation.South);
+
+            return orientations;
+        }
+
+        public void SetBlock(int worldX, int worldY, int worldZ, Blocks block)
+        {
+            int chunkX = worldX / Chunk.Size;
+            int chunkZ = worldZ / Chunk.Size;
+            Chunk chunk = GetChunk(chunkX, chunkZ);
+            if (chunk == null) return;
+
+            int localX = worldX % Chunk.Size;
+            int localZ = worldZ % Chunk.Size;
+
+            chunk.SetBlock(localX, worldY, localZ, block);
+
+            if (block == Blocks.Air && (localX == 15 || localX == 0) || (localZ == 15 || localZ == 0))
+            {
+                foreach (var orientation in GetEdgeOrientations(localX, localZ, Chunk.Size))
+                {
+                    if (chunk.Neighbors.TryGetValue(orientation, out var neighbor) && neighbor != null)
+                    {
+                        neighbor.UpdateChunkMesh();
+                    }
+                }
+            }
+        }
+
+        public IEnumerable<(Orientation orientation, Chunk neighbor)> GetChunkNeighbors(Chunk chunk)
+        {
+            Dictionary<Orientation, (int x, int y)> offsets = new()
+            {
+                { Orientation.West, (1, 0) },
+                { Orientation.East, (-1, 0) },
+                { Orientation.North, (0, 1) },
+                { Orientation.South, (0, -1) }
+            };
+
+            foreach (var kv in offsets)
+            {
+                int nx = chunk.X + kv.Value.x;
+                int ny = chunk.Y + kv.Value.y;
+
+                Chunk neighbor = GetChunk(nx, ny);
+                if (neighbor != null)
+                    yield return (kv.Key, neighbor);
+            }
+        }
+
+        public (bool success, Blocks block, int x, int y, int z, Vector3i normal) Raycast(Vector3 origin, Vector3 direction, float maxDistance)
+        {
+            int x = (int)MathF.Floor(origin.X);
+            int y = (int)MathF.Floor(origin.Y);
+            int z = (int)MathF.Floor(origin.Z);
+
+            int stepX = direction.X > 0 ? 1 : -1;
+            int stepY = direction.Y > 0 ? 1 : -1;
+            int stepZ = direction.Z > 0 ? 1 : -1;
+
+            float tDeltaX = direction.X != 0 ? MathF.Abs(1 / direction.X) : float.MaxValue;
+            float tDeltaY = direction.Y != 0 ? MathF.Abs(1 / direction.Y) : float.MaxValue;
+            float tDeltaZ = direction.Z != 0 ? MathF.Abs(1 / direction.Z) : float.MaxValue;
+
+            float tMaxX = direction.X > 0 ? (MathF.Floor(origin.X) + 1 - origin.X) * tDeltaX
+                : (origin.X - MathF.Floor(origin.X)) * tDeltaX;
+            float tMaxY = direction.Y > 0 ? (MathF.Floor(origin.Y) + 1 - origin.Y) * tDeltaY
+                : (origin.Y - MathF.Floor(origin.Y)) * tDeltaY;
+            float tMaxZ = direction.Z > 0 ? (MathF.Floor(origin.Z) + 1 - origin.Z) * tDeltaZ
+                : (origin.Z - MathF.Floor(origin.Z)) * tDeltaZ;
+
+            float distance = 0f;
+            Vector3i normal = Vector3i.Zero;
+
+            while (distance <= maxDistance)
+            {
+                Blocks block = GetBlock(x, y, z);
+
+                if (block != Blocks.Air)
+                    return (true, block, x, y, z, normal);
+
+                if (tMaxX < tMaxY && tMaxX < tMaxZ)
+                {
+                    x += stepX;
+                    normal = new Vector3i(-stepX, 0, 0);
+                    distance = tMaxX;
+                    tMaxX += tDeltaX;
+                }
+                else if (tMaxY < tMaxZ)
+                {
+                    y += stepY;
+                    normal = new Vector3i(0, -stepY, 0);
+                    distance = tMaxY;
+                    tMaxY += tDeltaY;
+                }
+                else
+                {
+                    z += stepZ;
+                    normal = new Vector3i(0, 0, -stepZ);
+                    distance = tMaxZ;
+                    tMaxZ += tDeltaZ;
+                }
+            }
+
+            return (false, Blocks.Air, 0, 0, 0, Vector3i.Zero);
+        }
+
+        public void Update()
+        {
+
+        }
+    }
+}

Worldgen.cs

@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Voxel
+{
+    public static class Worldgen
+    {
+        private static int baseHeight = 32;
+
+        private static float res1 = 2;
+        private static float res2 = 4;
+        private static float amplitude1 = 4;
+        private static float amplitude2 = 2;
+
+        private static float elevationMapRes = (float)1/8;
+        private static float elevationMapAmplitude = 32;
+
+        private static Random random = new Random();
+        private static FastNoiseLite noise = new FastNoiseLite(random.Next());
+        
+        public static int GetHeight(int x, int z)
+        {
+            float map1 = noise.GetNoise(
+                x * res1,
+                z * res1
+                ) * amplitude1;
+
+            float map2 = noise.GetNoise(x * res2,
+                z * res2
+                ) * amplitude2;
+
+            float elevationMap = (noise.GetNoise(
+                x * elevationMapRes,
+                z * elevationMapRes
+                ) + 0.25f) * elevationMapAmplitude;
+            return baseHeight + (int)(elevationMap + map1 + map2);
+        }
+
+        public static Blocks GetBlock(int y, int maxY)
+        {
+            if (y > maxY)
+            {
+                return Blocks.Air;
+            }
+
+            if (y == maxY)
+            {
+                if (y < baseHeight)
+                    return Blocks.Sand;
+                else
+                    return Blocks.Grass;
+            }
+
+            if (y < 4)
+            {
+                if (y == 0) return Blocks.Bedrock;
+
+                float randomValue = random.NextSingle();
+
+                if (randomValue < (1f / y))
+                {
+                    return Blocks.Bedrock;
+                }
+
+                return Blocks.Stone;
+            }
+
+            if (y > maxY - 6)
+            {
+                return Blocks.Dirt;
+            }
+
+            return Blocks.Stone;
+        }
+    }
+}