71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
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#include "../include/objects.hpp"
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/* Plane */
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Plane::Plane(const v3& n, choice_t offset, const Material& specs, int surface_type)
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: Renderable(specs), n(n), offset(offset), surface_type(surface_type) {}
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Plane::Plane(const v3& n, choice_t offset, const Material& specs) : Plane(n, offset, specs, 2) {}
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int Plane::intersect(const v3& eye, const v3& dir, choice_t& hit_dist, v3& hit_loc, v3& hit_normal)
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{
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const choice_t d = dir ^ n;
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if(d <= 0) return 0;
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const choice_t k = -((eye ^ n) + offset) / d;
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hit_loc = eye + dir * k;
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hit_normal = n;
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hit_dist = (hit_loc - eye).len();
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return surface_type;
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}
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/* Sphere */
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Sphere::Sphere(const v3& origin, choice_t r, const Material& specs, int surface_type)
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: Renderable(specs), o(origin), r(r), surface_type(surface_type) {}
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Sphere::Sphere(const v3& origin, choice_t r) : Sphere(origin, r, Material(), 1) {}
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template<int K = 1>
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static inline int _sphere_intersect(Sphere& self, const v3& eye, const v3& dir, choice_t& hit_dist, v3& hit_loc, v3& hit_normal)
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{
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const v3 d = self.o - eye;
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const choice_t dist_above_o = dir ^ d;
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// We're facing directly away from the sphere
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if(dist_above_o < 0) { return -1; }
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// The ray is pointing directly at the center of the sphere
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// if(fabs(dist_above_o - d.len()) < 1e-5) {
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// hit_loc = eye + d.norm() * (d.len() - self.r);
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// hit_normal = self.normal(hit_loc);
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// hit_dist = (hit_loc - eye).len();
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// return self.surface_type;
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// }
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const choice_t rejection = sqrtf(d.len() * d.len() - dist_above_o * dist_above_o);
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// The ray is tangent/missing the sphere
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if(rejection >= self.r) return -1;
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choice_t inside = sqrt(self.r*self.r - rejection*rejection) * K;
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hit_dist = dist_above_o - inside;
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hit_loc = eye + dir * hit_dist;
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hit_normal = self.normal(hit_loc);
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return self.surface_type;
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}
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int Sphere::intersect(const v3& eye, const v3& dir, choice_t& hit_dist, v3& hit_loc, v3& hit_normal)
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{ return _sphere_intersect(*this, eye, dir, hit_dist, hit_loc, hit_normal); }
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int Sphere::transmit(const v3& eye, const v3& dir, choice_t& hit_dist, v3& hit_loc, v3& hit_normal)
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{ return _sphere_intersect<-1>(*this, eye, dir, hit_dist, hit_loc, hit_normal); }
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/* Light */
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Light::Light(const v3& origin, choice_t r, const v3& colour) : Light(origin, r,
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Material{ .specular = 0,
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.roughness = 1,
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.colour = colour }) {}
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Light::Light(const v3& origin, choice_t r, const Material& specs) : Sphere(origin, r, specs, 0) {}
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