Use vertex pulling for clouds

shader/pull/ellipse.vert

@@ -0,0 +1,18 @@
+#version 450 core
+struct Verx { vec4 pos; vec4 col; };
+layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
+layout (std430, binding = 6) readonly buffer Pos { Verx data[]; };
+int indices[6] = {0,1,3,0,3,2};
+out vec4 vColC;
+out vec4 vColE;
+out vec4 vPos;
+out vec2 vDist;
+void main()
+{
+    uint i0 = gl_VertexID / 6;
+    uint k = indices[gl_VertexID % 6];
+    vec4 br = 
+  //gl_Position = theMat * vec4(pos,1);
+  gl_Position = vec4(pos,1);
+  vCol = col;
+}