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uniform sampler2D tDiffuse;
varying vec2 vUv;
void main()
{
vec4 texel = texture2D( tDiffuse, vUv );
vec3 luma = vec3( 0.299, 0.587, 0.114 );
float v = dot( texel.xyz, luma );
gl_FragColor = vec4( v, v, v, texel.w );
}
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