54 lines
1.1 KiB
C++
54 lines
1.1 KiB
C++
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#include <stdlib.h> /* rand() */
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#include <iostream>
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#include "Ray.h"
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Ray::Ray()
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{
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}
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Ray::Ray(const Vector & origin, const Vector & direction)
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{
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m_origin = origin;
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m_direction = direction;
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m_direction.normalize();
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}
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Ray Ray::randomRay()
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{
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double x, y, z;
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do
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{
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x = 2.0 * rand() / RAND_MAX - 1.0;
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y = 2.0 * rand() / RAND_MAX - 1.0;
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z = 2.0 * rand() / RAND_MAX - 1.0;
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} while (x*x + y*y + z*z <= 1.0);
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return Ray(Vector(0, 0, 0), Vector(x, y, z));
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}
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/*
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* return a vector for the point at distance dist
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* from the ray's origin point, along its direction.
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*/
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Vector Ray::getPositionAt(double dist) const
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{
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Vector v;
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v[0] = m_origin[0] + dist * m_direction[0];
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v[1] = m_origin[1] + dist * m_direction[1];
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v[2] = m_origin[2] + dist * m_direction[2];
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return v;
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}
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std::ostream & operator<<(std::ostream & out, const Ray & r)
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{
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out << "(" << r.getOrigin() << " -> " << r.getDirection() << ")";
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return out;
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}
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Ray Ray::shift(double amt)
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{
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return Ray(getPositionAt(amt), m_direction);
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}
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