vec3 Scene::calculPixel(const Rayon& ray, float dist, const vec3& oeil, float &oclu) const
{
#if 0
return vec3(dist*0.17, dist*0.19, dist*0.23);
#else
const vec3 dRay = ray.getDirection();
vec3 p(ray.getOrigine() + dRay*dist);
node->repositionne(p);
const vec3 n(node->getNormal(p));
Material texture = node->getMaterial(p);
//return texture.getColor();
std::vector<Lumiere> lumieres2;
//lumieres2.reserve(NB_RAYONS_CIEL+this->lumieres.size());
float ombre = calculPoisson(p, n, lumieres2);
oclu = ombre;
if(ombre > 0)
{
//for(const Lumiere& l: this->lumieres)
//lumieres2.push_back(l);
vec3 color = phong(texture, p, lumieres2, n, oeil);
//color *= ombre;
color = glm::clamp(color, vec3(0,0,0), vec3(1,1,1));
return color;
}
else
return NOIR;
#endif
}
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, float& dist) const
{
Vector OC(sphereOrigin-rayon.getOrigin());
float k(dotProduct(OC,rayon.getDirect()));
float h(dotProduct(OC,OC) - k*k);
if (h <= radius*radius)
{
return true;
}
else
{
return false;
}
}
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;
}
}
bool Terrain::intersect(const Rayon& rayon, float &coeffDistance, int &i) const
{
float dmin;
float dmax;
if(!box.intersect(rayon, dmin, dmax ))
return false;
//à modifier à cause de la précision des floats, mais c'est bizarre que ça marche comme un gant. faire attention que le point de départ ne soit pas en dehors de la box.
//dmin = 0.0;
//dmax = 3000.0;
coeffDistance = dmin;
for(i = 0; i<128; i++)
{
vec3 pos = rayon.getOrigine() + coeffDistance*rayon.getDirection();
float h = getHauteur( pos );
if(h == HAUTEUR_HORS_MAP) {
if(i == 0) {
coeffDistance += 0.01f;
continue;
}
else
break;
}
h = fabsf(pos.z - h);
if( h <(0.002 * coeffDistance) ) {
return true;
}else if(coeffDistance > dmax )
break;
coeffDistance += 0.3*h;
}
return false;
}
bool Triangle::calculIntersection(const Rayon &r, Intersection &I){
//MINIMUM STORAGE RAY TRIANGLE INTERSECTION BY TRUMBORE AND MULLER
/*glm::vec3 edge1, edge2, tvec, pvec, qvec;
float det, inv_det;
float u, v, t;
Intersection inter;
edge1 = V1 - V0;
edge2 = V2 - V0;
pvec = glm::cross(r.Vect(), edge2);
det = glm::dot(edge1, pvec);
//bool i = glm::intersectRayTriangle(r.Orig(), r.Vect(), V0, V1, V2, edge1);
if (det < 0.000001){
return false;
}
tvec = r.Orig() - V0;
u = glm::dot(tvec, pvec);
if (u < 0.0f || u > det){
return false;
}
qvec = glm::cross(tvec, edge1);
v = glm::dot(r.Vect(), qvec);
if (v < 0.0f || u + v > det){
return false;
}
t = glm::dot(edge2, qvec);
inv_det = 1.0f / det;
t *= inv_det;
u *= inv_det;
v *= inv_det;
//Intersection inter;
inter.dist = t;
inter.Objet = this;
inter.normal = glm::normalize(glm::cross(edge1, edge2));
I = inter;
if (det > -0.000001 && det < 0.000001){
return false;
}
//inv_det = 1.0f / det;
tvec = r.Orig() - V0;
u = glm::dot(tvec, pvec) * inv_det;
if (u < 0.0f || u > 1.0f){
return false;
}
qvec = glm::cross(tvec, edge1);
v = glm::dot(r.Vect(), qvec)*inv_det;
if (v < 0.0f || u + v > 1.0f){
return false;
}
t = glm::dot(edge2, qvec) * inv_det;
//Intersection inter;
inter.dist = t;
inter.Objet = this;
glm::vec3 normal = glm::cross(edge1, edge2);
if (normal.z > 0){
normal.z = -normal.z;
inter.normal = glm::normalize(normal);
I = inter;
return true;
}
inter.normal = glm::normalize(normal);
I = inter;
return true;*/
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/*
glm::vec3 edge1 = V1 - V0;
glm::vec3 edge2 = V2 - V0;
glm::vec3 pvec = glm::cross(r.Vect(), edge2);
float det = glm::dot(edge1, pvec);
if (det == 0){ return false; }
float invDet = 1.0f / det;
glm::vec3 tvec = r.Orig() - V0;
float u;
if (det < 0){
u = glm::dot(tvec, pvec) * invDet;
}
else{
u = glm::dot(tvec, pvec);
}
if (u < 0 || u > 1.0f){ return false; }
glm::vec3 qvec = glm::cross(tvec, edge1);
float v = glm::dot(r.Orig(), qvec) * invDet;
if (v < 0 || u + v > 1.0f){ return false; }
float t = glm::dot(edge2, qvec) * invDet;
Intersection inter;
inter.dist = t;
inter.Objet = this;
glm::vec3 normale = glm::normalize(glm::cross(edge1, edge2));
inter.normal = glm::normalize(glm::cross(edge2, edge1));
if (inter.normal.z > 0){ inter.normal.z = -inter.normal.z; }
I = inter;
return true;*/
////////////////////////////////////////////////////////////////////////////////////////////////////////////
double det, invdet;
glm::vec3 edge1 = V1 - V0;
glm::vec3 edge2 = V2 - V0;
/* Find the cross product of edge2 and the ray direction */
glm::vec3 s1 = glm::cross(r.Vect(), edge2);
det = glm::dot(edge1, s1);
if (det > -0.000001 && det < 0.000001) {
return false;
}
invdet = 1 / det;
glm::vec3 s2 = r.Orig() - V0;
double u = glm::dot(s2, s1) * invdet;
if (u < 0 || u > 1) {
return false;
}
glm::vec3 s3 = glm::cross(s2, edge1);
double v = glm::dot(r.Vect(), s3) * invdet;
if (v < 0 || (u + v) > 1) {
return false;
}
double tmp = glm::dot(edge2, s3) * invdet;
if (tmp < 0) {
return false;
}
/* subtract tiny amount - otherwise artifacts due to floating point imprecisions... */
float dist = tmp /*- 0.005*/;
glm::vec3 normal = glm::normalize(glm::cross(edge2, edge1));
Intersection inter;
inter.dist = dist;
inter.Objet = this;
inter.normal = -normal;
//if (inter.normal.z >= 0){ inter.normal.z = -inter.normal.z; }
I = inter;
return true;
}
bool Scene::intersect(const Rayon& r, float& dist, int& i) const
{
return intersect(r.getOrigine(), r.getDirection(), dist, i);
}
inline float Box::intersectIn(const Rayon& r) const
{
float tmax, tymax, tzmax;
if(r.getDirection()(0) == 0)
tmax = FLT_MAX;
else if(r.getDirection()(0) > 0)
tmax = (max(0) - r.getOrigine()(0)) / r.getDirection()(0);
else
tmax = (min(0) - r.getOrigine()(0)) / r.getDirection()(0);
if(r.getDirection()(1) == 0)
tymax = FLT_MAX;
else if(r.getDirection()(1) >= 0)
tymax = (max(1) - r.getOrigine()(1)) / r.getDirection()(1);
else
tymax = (min(1) - r.getOrigine()(1)) / r.getDirection()(1);
if(tymax < tmax)
tmax = tymax;
if(r.getDirection()(2) == 0)
return tmax;
else if(r.getDirection()(2) > 0)
tzmax = (max(2) - r.getOrigine()(2)) / r.getDirection()(2);
else
tzmax = (min(2) - r.getOrigine()(2)) / r.getDirection()(2);
if(tzmax < tmax)
return tzmax;
return tmax;
}
bool Box::intersect(const Rayon &r, float &distanceMin, float &distanceMax) const
{
if(this->isIn(r.getOrigine())) {
distanceMin = 0;
distanceMax = intersectIn(r);
return true;
}
float tmin, tmax, tymin, tymax, tzmin, tzmax;
float div;
if(r.getDirection()(0) == 0) {
tmin = FLT_MIN;
tmax = FLT_MAX;
}
else if(r.getDirection()(0) > 0) {
div = 1 / r.getDirection()(0);
tmin = (min(0) - r.getOrigine()(0)) * div;
tmax = (max(0) - r.getOrigine()(0)) * div;
}
else {
div = 1 / r.getDirection()(0);
tmin = (max(0) - r.getOrigine()(0)) * div;
tmax = (min(0) - r.getOrigine()(0)) * div;
}
if(r.getDirection()(1) == 0) {
tymin = FLT_MIN;
tymax = FLT_MAX;
}
else if(r.getDirection()(1) >= 0) {
div = 1 / r.getDirection()(1);
tymin = (min(1) - r.getOrigine()(1)) * div;
tymax = (max(1) - r.getOrigine()(1)) * div;
}
else {
div = 1 / r.getDirection()(1);
tymin = (max(1) - r.getOrigine()(1)) * div;
tymax = (min(1) - r.getOrigine()(1)) * div;
}
if( (tmin > tymax) || (tymin > tmax) )
return false;
if(tymin > tmin)
tmin = tymin;
if(tymax < tmax)
tmax = tymax;
if(r.getDirection()(2) == 0) {
tzmin = FLT_MIN;
tzmax = FLT_MAX;
}
else if(r.getDirection()(2) > 0) {
div = 1 / r.getDirection()(2);
tzmin = (min(2) - r.getOrigine()(2)) * div;
tzmax = (max(2) - r.getOrigine()(2)) * div;
}
else {
div = 1 / r.getDirection()(2);
tzmin = (max(2) - r.getOrigine()(2)) * div;
tzmax = (min(2) - r.getOrigine()(2)) * div;
}
if( (tmin > tzmax) || (tzmin > tmax) )
return false;
if(tzmin > tmin)
tmin = tzmin;
if(tzmax < tmax)
tmax = tzmax;
if(tmin>=0)
distanceMin = tmin;
//else
// return false; //inutile apparament
//distanceMin += 0.002;
if(tmax>0)
distanceMax = tmax;
return true;
}
