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#include "omni.hpp"
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using namespace CGLA;
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#include "scene.hpp"
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extern scene* current;
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omni::omni(const CGLA::Vec3f& phi)
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{
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	set_power(phi);
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}
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void omni::set_power(const CGLA::Vec3f& phi)
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{
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	power_ = phi;
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}
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bool omni::sample(const ray& r,
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				  const hit_info& hi,
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				  Vec3f& Li,
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				  Vec3f& w) const
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{
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	Vec3f light_point(trs_[0][3], trs_[1][3], trs_[2][3]);
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	w = normalize(light_point - hi.position);
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	float r2 = sqr_length(light_point - hi.position);
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	//send shadow feeler
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	ray s;
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	s.origin = hi.position + epsilon * w;
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	s.direction = w;
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	s.distance = std::sqrt(r2) - 2.f * epsilon;
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	s.depth = r.depth + 1;
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	if (current->intersect(s))
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		return false;
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	//compute radiance
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	Li = power_ / (4.f * float(M_PI) * r2);
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	return true;
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}
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//02566 framework, Anders Wang Kristensen, awk@imm.dtu.dk, 2007