update

shader/heatmap.frag

@@ -114,7 +114,7 @@ void main() {
     float vC = texture(uHeightTex, vUV).r;
     bool isZero = abs(vC) <= 1e-6;
     float t = value01(vC);
-    float m = maxNeighborValue(vUV);
+    float m = maxNeighborValueK(vUV, 2);
     float eps = max(1e-4, 0.001 * (uMaxV - uMinV));
     float force = smoothstep(uMaxV - eps, uMaxV, m);
     t = max(t, force);

shader/skirt.frag

@@ -0,0 +1,37 @@
+#version 330 core
+
+in vec3 vNormal;
+in vec3 vWorldPos;
+in vec3 vUV;
+out vec4 FragColor;
+
+uniform vec3 uCameraPos;
+uniform vec3 uLightDir;
+uniform sampler2D uHeightTex;
+uniform float uMinV;
+uniform float uMaxV;
+uniform vec2 uTexelSize;
+uniform vec3 uColorZero;
+uniform vec3 uColorLow;
+uniform vec3 uColorMid;
+uniform vec3 uColorHeigh;
+
+float saturate(float x) {
+    return clamp(x, 0.0, 1.0);
+}
+
+float value01(float v) {
+    return saturate((v - uMinV) / max(uMaxV - uMinV, 1e-6));
+}
+
+vec3 colorRamp(float t) {
+    if (t < 0.5) {
+        return mix(uColorLow, uColorMid, t / 0.5);
+    }
+
+    return mix(uColorHeigh, uColorMid, (t - 0.5) / 0.5);
+}
+
+float maxNeighborValue(vec2 uv) {
+    
+}

shader/skirt.vert

@@ -0,0 +1,18 @@
+#version 330 core
+
+layout(location=0) in vec3 aPos;
+layout(location=1) in vec3 aNormal;
+layout(location=2) in vec2 aUV;
+
+out vec3 vNormal;
+out vec3 vWorldPos;
+out vec2 vUV;
+
+uniform mat4 uMVP;
+
+void main() {
+    vWorldPos = aPos;
+    vNormal = aNormal;
+    vUV = aUV;
+    gl_Position = uMVP * vec4(aPos, 1.0);
+}