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tracer.cpp
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197 lines (175 loc) · 7.01 KB
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#include "tracer.h"
#include <math.h>
#include <cmath>
#include <iostream>
#define kEpsilon_plane 0.001f
#define kEpsilon_sphere 0.001f
Tracer::Tracer()
{
//nothing
}
Tracer::~Tracer()
{
//nothing
}
//This is a pretty important function
bool Tracer::hit(Directional_ray& ray, Object* obj, Scene_info& info)
{
switch( obj->type() )
{
case obj_type::Invalid:{
std::cout<<"Error(Tracer): Invalid object"<<std::endl;
return false;
}
case obj_type::Sphere:{
Sphere* sph = reinterpret_cast<Sphere*>(obj);
double t;
Vector3d temp = ray.get_orig() - sph->center();
double a = ray.get_dir() * ray.get_dir();
double b = (temp * ray.get_dir()) * 2;
double c = temp * temp - sph->radius() * sph->radius();
double disc = b * b - 4.0 * a * c;
if (disc < 0.0)
return false;
else
{
double e = sqrt(disc);
double denom = 2.0 * a;
t = (-b - e) / denom; // smaller root
if (t > kEpsilon_sphere)
{
//tmin = t;
//info.normal = (temp + t * ray.d) / radius;
info._hit_point.set_point(ray.get_orig().get_x() + t * ray.get_dir().get_x(),
ray.get_orig().get_y() + t * ray.get_dir().get_y(),
ray.get_orig().get_z() + t * ray.get_dir().get_z());
info._color = sph->color();
return true;
}
t = (-b + e) / denom; // larger root
if (t > kEpsilon_sphere)
{
//tmin = t;
//info.normal = (temp + t * ray.d) / radius;
info._hit_point.set_point(ray.get_orig().get_x() + t * ray.get_dir().get_x(),
ray.get_orig().get_y() + t * ray.get_dir().get_y(),
ray.get_orig().get_z() + t * ray.get_dir().get_z());
info._color = sph->color();
return true;
}
}
break;
}
case obj_type::Plane:{
Plane* pln = reinterpret_cast<Plane*>(obj);
float t = (pln->get_a() - ray.get_orig()) * pln->get_n() / (ray.get_dir() * pln->get_n());
if(t > kEpsilon_plane){
info._hit_point.set_point(ray.get_orig().get_x() + t * ray.get_dir().get_x(),
ray.get_orig().get_y() + t * ray.get_dir().get_y(),
ray.get_orig().get_z() + t * ray.get_dir().get_z());
info._color = pln->color();
}
else
return false;
return true;
break;
}
case obj_type::Triangle:{
Triangle* tri = reinterpret_cast<Triangle*>(obj);
Vector3d edgeA = tri->get_b() - tri->get_a();
Vector3d edgeB = tri->get_c() - tri->get_b();
Vector3d edgeC = tri->get_a() - tri->get_c();
Vector3d norm = edgeA ^ edgeB;
norm.normalize_vector();
tri->set_n(norm);
double area = std::abs(edgeA*edgeB);//2 times the area of triangle
float t = (tri->get_a() - ray.get_orig()) * tri->get_n() / (ray.get_dir() * tri->get_n());
//hit the plane
if(t > kEpsilon_plane){
//then inside triangle
Point3d P = Point3d(ray.get_orig().get_x() + t * ray.get_dir().get_x(),
ray.get_orig().get_y() + t * ray.get_dir().get_y(),
ray.get_orig().get_z() + t * ray.get_dir().get_z());
Vector3d edgePA = P - tri->get_a();
Vector3d edgePB = P - tri->get_b();
Vector3d edgePC = P - tri->get_c();
if((norm * (edgeA ^ edgePA) > 0) &&
(norm * (edgeB ^ edgePB) > 0) &&
(norm * (edgeC ^ edgePC) > 0))
{
info._hit_point = P;
info._color = tri->color();
return true;
}
}
break;
}
case obj_type::Disc:{
Disc *dis = reinterpret_cast<Disc*>(obj);
Point3d a = Point3d(0.f, -(dis->get_n().get_z())/dis->get_n().get_y(), 1.f);
float t = (a - ray.get_orig()) * dis->get_n() / (ray.get_dir() * dis->get_n());
float radiusSQ = dis->get_r() * dis->get_r();
//hit the plane
if(t > kEpsilon_plane){
//then inside disc
Point3d P = Point3d(ray.get_orig().get_x() + t * ray.get_dir().get_x(),
ray.get_orig().get_y() + t * ray.get_dir().get_y(),
ray.get_orig().get_z() + t * ray.get_dir().get_z());
if( ((P.get_x()-dis->center().get_x())*(P.get_x()-dis->center().get_x()) +
(P.get_y()-dis->center().get_y())*(P.get_y()-dis->center().get_y()) +
(P.get_z()-dis->center().get_z())*(P.get_z()-dis->center().get_z()) ) <= radiusSQ)
{
info._hit_point = P;
info._color = dis->color();
return true;
}
}
break;
}
case obj_type::Cylinder:{
Cylinder* cyl = reinterpret_cast<Cylinder*>(obj);
double t;
Vector3d rayD = ray.get_dir();
Vector3d cylD = cyl->get_dir();
Vector3d deltaP = ray.get_orig() - cyl->center();
double a = (rayD-(cylD*(rayD*cylD)))*(rayD-(cylD*(rayD*cylD)));
double b = 2*( (rayD-(cylD*(rayD*cylD)))*(deltaP-(cylD*(deltaP*cylD))) );
double c = (deltaP-(cylD*(deltaP*cylD)))*(deltaP-(cylD*(deltaP*cylD))) - cyl->get_r()*cyl->get_r();
double disc = b * b - 4.0 * a * c;
if (disc < 0.0)
return false;
else
{
double e = sqrt(disc);
double denom = 2.0 * a;
t = (-b - e) / denom; // smaller root
if ( (t > kEpsilon_sphere)&&(t < cyl->get_tmax()) ){
//tmin = t;
//info.normal = (temp + t * ray.d) / radius;
info._hit_point.set_point(ray.get_orig().get_x() + t * ray.get_dir().get_x(),
ray.get_orig().get_y() + t * ray.get_dir().get_y(),
ray.get_orig().get_z() + t * ray.get_dir().get_z());
info._color = cyl->color();
return true;
}
t = (-b + e) / denom; // larger root
if ( (t > kEpsilon_sphere)&&(t < cyl->get_tmax()) ){
//tmin = t;
//info.normal = (temp + t * ray.d) / radius;
info._hit_point.set_point(ray.get_orig().get_x() + t * ray.get_dir().get_x(),
ray.get_orig().get_y() + t * ray.get_dir().get_y(),
ray.get_orig().get_z() + t * ray.get_dir().get_z());
info._color = cyl->color();
return true;
}
}
break;
}
default:
{
std::cout<<"Error(Tracer): Unknown type"<<std::endl;
break;
}
}
return false;
}