1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586 |
- /*
- * DoRayMe - a quick and dirty Raytracer
- * Intersection header
- *
- * Created by Manoël Trapier
- * Copyright (c) 2020 986-Studio.
- *
- */
- #ifndef DORAYME_INTERSECTION_H
- #define DORAYME_INTERSECTION_H
- #include <stdlib.h>
- #include <ray.h>
- #include <material.h>
- #include <renderstat.h>
- class Shape;
- class Intersect;
- struct Computation
- {
- Computation(Shape *object, double t, Tuple point, Tuple eyev, Tuple normalv, Tuple overHitP,
- bool inside, Tuple reflectV = Vector(0, 0, 0), double n1 = 1.0, double n2 = 1.0,
- Tuple underHitP = Point(0, 0, 0), Material *objMat = nullptr) :
- object(object), t(t), hitPoint(point), eyeVector(eyev), normalVector(normalv), inside(inside),
- overHitPoint(overHitP), underHitPoint(underHitP), reflectVector(reflectV), n1(n1), n2(n2), material(objMat) { };
- double schlick()
- {
- /* Find the cos of the angle betzeen the eye and normal vector */
- double cos = this->eyeVector.dot(this->normalVector);
- double r0;
- /* Total internal reflection can only occur when n1 > n2 */
- if (this->n1 > this->n2)
- {
- double n, sin2_t;
- n = this->n1 / this->n2;
- sin2_t = (n * n) * (1.0 - (cos * cos));
- if (sin2_t > 1.0)
- {
- return 1.0;
- }
- /* Compute the cos of theta */
- cos = sqrt(1.0 - sin2_t);
- }
- r0 = ((this->n1 - this->n2) / (this->n1 + this->n2));
- r0 = r0 * r0;
- return r0 + (1 - r0) * ((1 - cos)*(1 - cos)*(1 - cos)*(1 - cos)*(1 - cos));
- };
- Shape *object;
- double t;
- Tuple hitPoint;
- Tuple overHitPoint;
- Tuple underHitPoint;
- Tuple eyeVector;
- Tuple normalVector;
- Tuple reflectVector;
- Material *material;
- double n1;
- double n2;
- bool inside;
- };
- class Intersection
- {
- public:
- double t;
- Shape *object;
- public:
- Intersection(double t, Shape *object) : t(t), object(object) { stats.addIntersection(); };
- bool nothing() { return (this->object == nullptr); };
- Computation prepareComputation(Ray r, Intersect *xs = nullptr);
- bool operator==(const Intersection &b) const { return ((this->t == b.t) && (this->object == b.object)); };
- };
- #endif /* DORAYME_INTERSECTION_H */
|