feat:3D multi dot

shaders/heatmap.vert

@@ -0,0 +1,27 @@
+#version 330 core
+
+layout(location = 0) in vec3 aPos;
+layout(location = 1) in vec2 aUV;
+
+out vec2 vUV;
+out vec3 vWorldPos;
+
+uniform mat4 uMVP;
+uniform sampler2D uHeightTex;
+uniform float uMinV;
+uniform float uMaxV;
+uniform float uHeightScale;
+uniform float uBaseZ;
+
+float value01(float v) {
+    return clamp((v - uMinV) / max(uMaxV - uMinV, 1e-6), 0.0, 1.0);
+}
+
+void main() {
+    vUV = aUV;
+    float v = texture(uHeightTex, aUV).r;
+    float h = value01(v) * uHeightScale;
+    vec3 world = aPos + vec3(0.0, 0.0, uBaseZ + h);
+    vWorldPos = world;
+    gl_Position = uMVP * vec4(world, 1.0);
+}