// Simple lighting model
varying vec3 N;
varying vec3 v;

// Fragment shader entry point
void main()
{
	// Calculate lighting parameters
	vec3 L = normalize(gl_LightSource[0].position.xyz - v);   
	vec4 Idiff = gl_FrontLightProduct[0].diffuse * max(dot(N,L), 0.0);  
	Idiff = clamp(Idiff, 0.0, 1.0); 

	// Make it green
	gl_FragColor = Idiff;
	gl_FragColor.x = 0.0;
	gl_FragColor.z = 0.0;
}