simpleColor.vert Example File
simplecustommaterial/shaders/es2/simpleColor.vert
  #define FP highp
  attribute FP vec3 vertexPosition;
  varying FP vec3 worldPosition;
  uniform FP mat4 modelMatrix;
  uniform FP mat4 mvp;
  void main()
  {
      // Transform position, normal, and tangent to world coords
      worldPosition = vec3(modelMatrix * vec4(vertexPosition, 1.0));
      // Calculate vertex position in clip coordinates
      gl_Position = mvp * vec4(worldPosition, 1.0);
  }