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#include "metal.h"
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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