basicSetupTutorialRmR.glsl

void mainImage( out vec4 fragColor, in vec2 fragCoord ) {
	
    
        // Normalized pixel coordinates (from 0 to 1)
    vec2 uv = (2.0 * fragCoord- iResolution.xy) / iResolution.y;
	
	vec3 ro = vec3(0., 2.0, -5.);
	vec3 rd = normalize(vec3(uv.x, uv.y, 1.));  
	
	vec3 col = vec3(0.25, .15, .2); // Sky color
	vec3 lig = normalize(vec3(-1., 5.7, -2.6));
	
	// Rendering part
    int nbRef = 5;
    for(int i = 0; i < nbRef; i ++)
    {	
		float t = castRay(ro, rd);		
    	if(t > 0.0)
    	{
      // Stuff we will compute
    	}
    
    }

		
	fragColor = vec4(col, 1);
}