60b29d658d
git-svn-id: svn://anubis/fart/branches/2009-03-09_intersect_returning_normals@200 7f9b0f55-74a9-4bce-be96-3c2cd072584d
44 lines
1.4 KiB
C++
44 lines
1.4 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::IntersectionList Sphere::intersect(refptr<Shape> _this, const Ray & ray)
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{
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Ray ray_inv = m_inverse.transform_ray(ray);
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IntersectionList 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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Vector isect_point = ray_inv[quadSolutions.results[i]];
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Vector normal = isect_point;
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normal.normalize();
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res.add(
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Intersection(_this,
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m_transform.transform_point(isect_point),
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m_transform.transform_normal(normal))
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);
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}
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}
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return res;
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}
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