public LightColor Brightness(Vector3D eyePos, Vector3D pos,
Vector3D normal, Material mate)
{
LightColor ret = new LightColor(0.0D, 0.0D, 0.0D);
for (int i = 0; i < NLights(); i++)
{
ret = ret.Add(GetLight(i).CalcBrightness(eyePos, pos, normal, mate));
}
ret = ret.Add(mate.radiation).Mult(iris);
return(ret);
}
