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      1 #ifdef GL_ES 
      2 precision mediump float;
      3 #endif
      4  
      5 uniform samplerCube u_environmentMapTexture;
      6  
      7 varying vec4 v_position;
      8  
      9 void main() {
     10 	vec3 center = vec3(0.0);
     11 	vec3 dir = vec3(v_position) - center;
     12 	gl_FragColor = textureCube(u_environmentMapTexture, dir); 
     13 }