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- /*
- * DoRayMe - a quick and dirty Raytracer
- * Intersection implementation
- *
- * Created by Manoël Trapier
- * Copyright (c) 2020 986-Studio.
- *
- */
- #include <intersection.h>
- #include <shape.h>
- #include <list.h>
- Computation Intersection::prepareComputation(Ray r, Intersect *xs)
- {
- double n1 = 1.0;
- double n2 = 1.0;
- Tuple hitP = r.position(this->t);
- Tuple normalV;
- if (xs != nullptr)
- {
- Intersection hit = xs->hit();
- normalV = this->object->normalAt(hitP, &hit);
- }
- else
- {
- normalV = this->object->normalAt(hitP, nullptr);
- }
- Tuple eyeV = -r.direction;
- bool inside = false;
- if (normalV.dot(eyeV) < 0)
- {
- inside = true;
- normalV = -normalV;
- }
- Tuple overHitP = hitP + normalV * getEpsilon();
- Tuple underHitP = hitP - normalV * getEpsilon();
- Tuple reflectV = r.direction.reflect(normalV);
- /* If the hit object is not transparent, there is no need to do that. I think .*/
- if ((xs != nullptr) && (xs->hit().object->material.transparency > 0))
- {
- List containers;
- int j, k;
- for (j = 0 ; j < xs->count() ; j++)
- {
- Intersection i = ( *xs )[j];
- if (*this == i)
- {
- if (!containers.isEmpty())
- {
- n1 = containers.last()->material.refractiveIndex;
- }
- }
- if (containers.doesInclude(i.object))
- {
- containers.remove(i.object);
- }
- else
- {
- containers.append(i.object);
- }
- if (*this == i)
- {
- if (!containers.isEmpty())
- {
- n2 = containers.last()->material.refractiveIndex;
- }
- /* End the loop */
- break;
- }
- }
- }
- Shape *s = this->object;
- /* For now don't get root group material */
- while((!s->materialSet) && (s->parent != nullptr)) { s = s->parent; }
- return Computation(this->object,
- this->t,
- hitP,
- eyeV,
- normalV,
- overHitP,
- inside,
- reflectV,
- n1,
- n2,
- underHitP,
- &s->material);
- }
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