// 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;
}
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