Ring.cc

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#include "Ring.h"
#include "BoundingBox.h"
#include "HitRecord.h"
#include "Math.h"
#include "Ray.h"
#include <iostream>
#include <stdlib.h>
using namespace std;

Ring::Ring(Material* material, const Point &c, const Vector& n, const double r1, const double r2)
    : Primitive(material), center(c), norm(n), radius1(r1), radius2(r2)
{
    r1Sq = r1 * r1;
    r2Sq = r2 * r2;

    norm.normalize();
    d = Dot(norm, c);
}

Ring::~Ring()
{
}

void Ring::intersect(HitRecord& hit, const RenderContext& context, const Ray& ray) const
{
    double denom = Dot(norm, ray.direction());
    if(Abs(denom) > 1.e-6){
        double t = (d-Dot(norm, ray.origin()))/denom;

        Point pt = ray.origin() + ray.direction() * t;

        Vector v = pt - center;
    
        double l = v.length2();
        if (l < r2Sq && l > r1Sq) {
            hit.hit(t, this, matl);
        }
    }

}


void Ring::normal(Vector& normal, const RenderContext&,
                   const Point&, const Ray&, const HitRecord&) const
{
    normal = norm;
}

void Ring::getBounds(BoundingBox& bbox) const
{
  Vector diag(radius1, radius1, radius1);
  bbox.extend(center+diag);
  bbox.extend(center-diag);
}

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