update

shader/heatmap.frag

@@ -0,0 +1,27 @@
+#version 330 core
+in vec2 vUV;
+in vec3 vWorldPos;
+out vec4 FragColor;
+
+uniform sampler2D uHeightTex;
+uniform float uMinV;
+uniform float uMaxV;
+uniform float uHeightScale;
+uniform vec2 uTexelSize;
+uniform vec2 uPlaneSize;
+uniform vec3 uCameraPos;
+uniform vec3 uLightDir;
+uniform vec3 uColorZero;
+uniform vec3 uColorLow;
+uniform vec3 uColorMid;
+uniform vec3 uColorHigh;
+
+float saturate(float x) {
+    return clamp(x, 0.0, 1.0);
+}
+
+float value01(float v) {
+    return saturate((v - uMinV) / max(uMaxV - uMinV, 1e-6));
+}
+
+float maxNeighborValue(vec2 uv)