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#include "camera.h"
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using namespace CGLA;
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camera::camera(const CGLA::Vec3f& eye,
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               const CGLA::Vec3f& cnt,
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               const CGLA::Vec3f& up,
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               float focal)
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{
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    eye_ = eye;
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    z_ = normalize(eye - cnt);
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    x_ = normalize(cross(up, z_));
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    y_ = cross(z_, x_);
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    x_ *= 0.012f;
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    y_ *= 0.012f;
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    focal_ = focal;
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}
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ray camera::generate(const Vec2f& uv) const
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{
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    Vec2f xy = 2.f * uv - Vec2f(1.f);
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    ray r;
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    r.origin = eye_;
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    r.direction = normalize(-focal_*z_ + xy[0]*x_ + xy[1]*y_);
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    r.depth = 0;
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    r.distance = std::numeric_limits<float>::infinity();
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    return r;
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}
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//02566 framework, Anders Wang Kristensen, awk@imm.dtu.dk, 2007