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346 awk 1 
#include "metal.hpp"
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using namespace CGLA;
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metal::metal(const CGLA::Vec3f& c, float s, float ior, float ext)
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: material(ior, ext), color_(c), shininess_(s)
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{
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}
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void metal::sample(const ray& r, hit_info& hi) const
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{
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	//compute fresnel
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	float cosi = dot(-r.direction, hi.shading_normal);
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	if (cosi <= 0.f)
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		return;
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	float f = fresnel_conductor(cosi, ior_, extinction_);
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	if (f < 0.f || f > 1.f)
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		return;
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	if (shininess_ < 1000.f)
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	{
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		hi.glossy = f * color_;
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		hi.shininess = shininess_;
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	}
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	else
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	{
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		hi.reflection = f * color_;
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	}
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	hi.ior = ior_;
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	hi.extinction = extinction_;
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}
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//02566 framework, Anders Wang Kristensen, awk@imm.dtu.dk, 2007