GLSL: How to get pixel x,y,z world position?

Question

I want to adjust the colors depending on which xyz position they are in the world.

I tried this in my fragment shader:

varying vec4 verpos;

void mai         


        

Answer 1

Or you could just divide the z coordinate by the w coordinate, which essentially un-does the perspective projection; giving you your original world coordinates.

ie.

depth = gl_FragCoord.z / gl_FragCoord.w;

Of course, this will only work for non-clipped coordinates..

But who cares about clipped ones anyway?