Color Scene::lanceRayon(const Rayon& ray, int iteration) const
{
this->addObjectsTabToBinder();
Color result(0.0,0.0,0.0);
float minDist(1000.0) ;
float dist (0.0) ;
Hit hit ;
if (binder->intersect(ray,0.0,100.0,hit))
{
//result = hit.getObject()->getOptic()->getColor(hit.getU(),hit.getV());
//result = hit.getObject()->getOptic()->getColor(0.5,0.5);
Color coulObj(hit.getObject()->getOptic()->getColor(hit.getU(),hit.getV()));
for ( std::vector<std::shared_ptr<LightSource>>::const_iterator it = lightsTab.begin(); it != lightsTab.end() ; ++it)
// pour chaque source
{
//d = calcul distance point intersection source
Vector directi(it->get()->getOrigin()-hit.getImpactPoint());
float distInterSource = directi.getNorm() ;
directi.normalize();
//initialiser Ray : point intersect, direction(point intersect, source), couleur = on s'en fout
Color c(0.0,0.0,0.0);
Color resultNorm(0.0,0.0,0.0);
Rayon ray(hit.getImpactPoint(),directi,c);
if (! binder->intersect(ray, 0, distInterSource))
{
Color diff(it->get()->getColor()*coulObj*(dotProduct(hit.getNormal(),ray.getDirect())));
Vector moinsV(-directi.getX(),-directi.getY(),-directi.getZ());
Vector miroirV(moinsV + hit.getNormal()*(2*(dotProduct(directi,hit.getNormal()))));
//Vmir = V symétrique par rapport à N
//spec = coulspec(obj)* (tronquerAZero(RayS.Vmir))^n * coul(source)
Color spec(it->get()->getColor()*coulObj*dotProduct(ray.getDirect(),miroirV));
resultNorm = diff + spec ;
if ( iteration < 2)
{
//Res2 = influence rayon réfléchi
Rayon reflected(hit.getImpactPoint(),miroirV,c);
Color reflectedColor(0.0,0.0,0.0);
reflectedColor = this->lanceRayon(reflected,iteration+1);
//return pourcent1*Res + ourcent2*Res2
result = resultNorm*0.8 + reflectedColor*0.2 ;
}
else
{
result = resultNorm ;
}
}
}
}
return result;
}
bool Sphere::intersect(const Rayon &rayon, Hit &hit, float& dist) const
{
const float m_Pi = 3.14159265358979323846;
Vector OC(sphereOrigin-rayon.getOrigin());
float k(dotProduct(OC,rayon.getDirect()));
float h(dotProduct(OC,OC) - k*k);
float radiusSquare = radius*radius ;
if (h <= radiusSquare)
{
float delta = sqrt(radiusSquare-h);
hit.setImpactPoint(rayon.getDistantPoint(k-delta));
dist = k-delta ;
if (dist <0)
{
return false ;
}
Vector normal(hit.getImpactPoint()-sphereOrigin);
normal.normalize();
hit.setNormal(normal);
hit.setV( (hit.getImpactPoint().z - (sphereOrigin.z - radius)) / (2*radius) );
Vector A (radius,0.0,0.0);
Vector B (hit.getImpactPoint().x-sphereOrigin.x,hit.getImpactPoint().y-sphereOrigin.y,0.0);
A.normalize();
B.normalize();
float cosAlpha = dotProduct(A,B) ;
float alphaAlpha = acos(cosAlpha) ;
float alpha ;
if (B.getY() >0)
{
alpha = alphaAlpha;
}
else
{
alpha = 2*m_Pi - alphaAlpha ;
}
hit.setU(alpha/(2*m_Pi));
return true;
}
else
{
return false;
}
}