46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
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#include "Sphere.h"
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#include "util/Solver.h"
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#include <math.h>
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#include <iostream>
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using namespace std;
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Sphere::Sphere(double radius)
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{
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m_radius = radius;
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m_radius2 = radius * radius;
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}
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Shape::IntersectList Sphere::intersect(const Ray & ray)
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{
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Ray ray_inv = m_inverse.transform_ray(ray);
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IntersectList res;
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QuadraticSolver solver(1.0,
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2 * ( ray_inv.getOrigin()[0] * ray_inv.getDirection()[0]
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+ ray_inv.getOrigin()[1] * ray_inv.getDirection()[1]
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+ ray_inv.getOrigin()[2] * ray_inv.getDirection()[2] ),
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ray_inv.getOrigin()[0] * ray_inv.getOrigin()[0]
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+ ray_inv.getOrigin()[1] * ray_inv.getOrigin()[1]
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+ ray_inv.getOrigin()[2] * ray_inv.getOrigin()[2]
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- m_radius2);
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Solver::Result quadSolutions = solver.solve();
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for (int i = 0; i < quadSolutions.numResults; i++)
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{
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if (quadSolutions.results[i] >= 0.0)
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{
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res.push_back(m_transform.transform_point(
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ray_inv[quadSolutions.results[i]]));
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}
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}
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return res;
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}
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Vector Sphere::getNormalAt(const Vector & pt)
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{
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Vector pt_inv = m_inverse.transform_point(pt);
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Vector normal = pt_inv;
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return normal.normalize();
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}
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