Run GLSL Code

• Make sure you are in GLSL(GPU) mode;
  
• Then edit the World rule;
• You will see there is already some code in the showed up panel;

void main(){
    outColor = getColor(uv);
}

This code is just send the input pixels to the output.

• You can change the getColor(uv) to vec4(uv,0.0,1.0) for geting a beautiful uv color pattern;

void main(){
    outColor = vec4(uv,0.0,1.0);
}

• Then, press the "Ok" button.
• If everything is right, you will get something in the scene like this: