all of the changes

include/FluidSim/Desktop/PressurePalette.hpp

@@ -0,0 +1,12 @@
+#pragma once
+#include "FluidSim/AudioProcessing.hpp"
+#include <algorithm>
+#include <cmath>
+namespace fluidsim::port::desktop {
+// Fixed absolute scale: vacuum blue, atmosphere green, >=1 MPa red.
+inline Vec3 pressure_tint(float pressure) {
+    if(pressure<=101325) {float t=std::clamp(pressure/101325,0.f,1.f);return {.05f,.15f+.70f*t,1-.95f*t};}
+    float t=std::sqrt(std::clamp((pressure-101325)/(1000000-101325),0.f,1.f));
+    return {.05f+.95f*t,.85f-.80f*t,.05f-.03f*t};
+}
+}