#version 120

void main(void)
{
	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
	
	float x = gl_Position.x;
	float y = gl_Position.y;
	float z = gl_Position.z;

	int depth = int(sqrt(x * x + y * y + z * z));

	if (depth > 10000 || depth < 800) {
		depth = 0;
	}
	int red = int(mod(depth, 32));
	int green = int(mod((depth / 32), 32));
	int blue = int(mod((depth / 1024), 32));
	float fRed = float(red) / 32.0;
	float fGreen = float(green) / 32.0;
	float fBlue = float(blue) / 32.0;
	gl_FrontColor = vec4(fRed, fGreen, fBlue, 1.0);
}