void testCrossProduct(){
Vector4 a;
Vector4 b;
a.SetVector4(1,2,0,1);
b.SetVector4(2,1,1,1);
Vector4* c;
c = a.CrossProduct(b,a);
c->DisplayVector4();
delete c;
}
void testVector(){
Vector4 a;
Vector4 b;
a.SetVector4(1,0,0,1);
b.SetVector4(2,0,0,2);
Vector4* c;
c = a.Add(b,a);
c->DisplayVector4();
delete c;
}
Vector4* findViewDirection(double xS, double yS, double zS){
Vector4* V = new Vector4();
V->SetVector4(eX-xS, eY-yS, eZ-zS,1.0);
V->ConvertToUnit();
return V;
}
/**
* Calculates the direction of the light source.
* @param xS
* @param yS
* @param zS
* @return
*/
Vector4* findLightDirection(double xS, double yS, double zS, Light& light){
double xL = light.position[0];
double yL = light.position[1];
double zL = light.position[2];
Vector4* L = new Vector4();
L->SetVector4(xL-xS, yL-yS, zL-zS,1.0);
return L;
}
Vector4* findReflectedRayDirection(Vector4 &N, Vector4& L){
Vector4* R;
Vector4* Rtemp = new Vector4();
Rtemp->SetVector4(0,0,0,1);
Rtemp->GetCopyOf(N);
double N_dot_L = N.DotProduct(N,L);
Rtemp->Elongate(2*N_dot_L);
R = Rtemp->Subtract(*Rtemp,L);
delete Rtemp;
return R;
}
Vector4* findNormalToSphere(double xS, double yS, double zS, Sphere& sphere){
//Coordinates of the centre of the sphere.
double x_c = sphere.position[0];
double y_c = sphere.position[1];
double z_c = sphere.position[2];
//radius of the sphere.
double S_r = sphere.radius;
Vector4* normal = new Vector4();
normal->SetVector4(xS-x_c, yS-y_c, zS-z_c, 1.0);
normal->ConvertToUnit();
return normal;
}
/**
* Finds a cross b.
* a and b must be in dimension 3 represented as 4 length vector in homogeneous coordinates.
* @param a
* @param b
* @return
*/
Vector4* Vector4::CrossProduct(Vector4 &u, Vector4 &v){
u.Homogenize();
v.Homogenize();
double a1 = u.getX();
double a2 = u.getY();
double a3 = u.getZ();
double b1 = v.getX();
double b2 = v.getY();
double b3 = v.getZ();
double x = a2*b3 - a3*b2;
double y = a3*b1 - a1*b3;
double z = a1*b2 - a2*b1;
Vector4* product = new Vector4();
product->SetVector4(x,y,z,1);
return product;
}
/**
* Finds a cross b.
* a and b must be in dimension 3 represented as 4 length vector in homogeneous coordinates.
* @param a
* @param b
* @return
*/
Vector4* Vector4::CrossProduct(Vector4 &u, Vector4 &v){
u.Homogenize();
v.Homogenize();
float a1 = u.getX();
float a2 = u.getY();
float a3 = u.getZ();
float b1 = v.getX();
float b2 = v.getY();
float b3 = v.getZ();
float x = a2*b3 - a3*b2;
float y = a3*b1 - a1*b3;
float z = a1*b2 - a2*b1;
Vector4* product = new Vector4();
product->SetVector4(x,y,z,1);
return product;
}
Color* getColor(Vector4& viewVector, double x, double y, double z, int depth){
Color* color = new Color(0,0,0);
int red = 0;
int green = 0;
int blue = 0;
double ka_red = 0.0;
double ka_green = 0.0;
double ka_blue = 0.0;
double kd_red = 0.0;
double kd_green = 0.0;
double kd_blue = 0.0;
double ks_red = 0.0;
double ks_green= 0.0;
double ks_blue = 0.0;
double shininess = 0.0;
//The view vector from the point of intersection to where the user is standing.
Vector4* V = findViewDirection(x,y,z);
V->ConvertToUnit();
//The normal vector to the surface obtained by interpolating the normals.
Vector4* N = new Vector4();
N->SetVector4(0,0,0,1);
if(iType == SPHERE){
N->GetCopyOf( *findNormalToSphere(x,y,z,spheres[index_sphere]) );
N->ConvertToUnit();
kd_red = spheres[index_sphere].color_diffuse[0];
kd_green = spheres[index_sphere].color_diffuse[1];
kd_blue = spheres[index_sphere].color_diffuse[2];
ks_red = spheres[index_sphere].color_specular[0];
ks_green = spheres[index_sphere].color_specular[1];
ks_blue = spheres[index_sphere].color_specular[2];
shininess = spheres[index_sphere].shininess;
}
if(iType == TRIANGLE){
N->GetCopyOf( *findNormalToTriangle(x,y,z,triangles[index_triangle]) );
N->ConvertToUnit();
Vector4* Kd = interpolateKd(x,y,z, triangles[index_triangle]);
Vector4* Ks = interpolateKs(x,y,z, triangles[index_triangle]);
kd_red = Kd->getX();
kd_green = Kd->getY();
kd_blue = Kd->getZ();
ks_red = Ks->getX();
ks_green = Ks->getY();
ks_blue = Ks->getZ();
shininess = interpolateShininess(x,y,z, triangles[index_triangle]);
delete Kd;
delete Ks;
}
ka_red = kd_red;
ka_green = kd_green;
ka_blue = kd_blue;
color->addMoreRed((int)getAmbientRed(ka_red));
color->addMoreGreen((int)getAmbientGreen(ka_green));
color->addMoreBlue((int)getAmbientBlue(ka_blue));
int i =0;
for(i = 0; i<num_lights; i++){
//Light Vector (From the point of intersection to the light source)
auto_ptr<Vector4> L(findLightDirection(x,y,z,lights[i]));
L->ConvertToUnit();
//Reflected Ray Vector
auto_ptr<Vector4> R(findReflectedRayDirection(*N, *L));
R->ConvertToUnit();
double LN = L->DotProduct(*L, *N);
double RV = R->DotProduct(*R, *V);
// if(isShadowed(x,y,z,lights[i]) and LN>=0){
if(isShadowed(x,y,z,lights[i])){
red = 0;
green = 0;
blue = 0;
}else{
red = getRed(lights[i].color[0], ka_red, kd_red, ks_red, LN, RV, shininess);
green = getGreen(lights[i].color[1], ka_green, kd_green, ks_green, LN, RV, shininess);
blue = getBlue(lights[i].color[2], ka_blue, kd_blue, ks_green, LN, RV, shininess);
}
// cout << "more Red "<<red<<", ";/////////////////////////////////////////////////////////
// cout << "more Green "<<green<<", ";
// cout << "more Blue "<<blue<<endl;
color->addMoreRed(red);
color->addMoreGreen(green);
color->addMoreBlue(blue);
// if(depth < MAX_DEPTH){
// auto_ptr<Ray> reflRay(new Ray(x,y,z,R->getX(), R->getY(), R->getZ()));
// Color* newColor = traceRay(*reflRay, depth+1);
//
// int newRed = (int)ks_red*newColor->getRed();
// int newGreen = (int)ks_green*newColor->getGreen();
// int newBlue = (int)ks_blue*newColor->getBlue();
//
// color->addMoreRed(newRed);
// color->addMoreGreen(newGreen);
// color->addMoreBlue(newBlue);
//
// delete newColor;
// }
}
if(depth < MAX_DEPTH){
auto_ptr<Vector4> reflVector(findReflectedRayDirection(*N, viewVector));
reflVector->ConvertToUnit();
auto_ptr<Ray> reflRay(new Ray(x,y,z,-1,-1,-1));
reflRay->setXd(reflVector->getX());
reflRay->setYd(reflVector->getY());
reflRay->setZd(reflVector->getZ());
double t_new = findIntersect(*reflRay);
if(t_new != NO_INTERSECTION){
double new_x_boom = getXIntersect(*reflRay, t_new);
double new_y_boom = getYIntersect(*reflRay, t_new);
double new_z_boom = getZIntersect(*reflRay, t_new);
Color* newColor = getColor(*reflVector, new_x_boom, new_y_boom, new_z_boom, depth+1);
int newRed = (int)(ks_red*newColor->getRed());
int newGreen = (int)(ks_green*newColor->getGreen());
int newBlue = (int)(ks_blue*newColor->getBlue());
//cout<<"new colors"<<newRed<<", "<<newGreen<<", "<<newBlue<<endl;
color->addMoreRed(newRed);
color->addMoreGreen(newGreen);
color->addMoreBlue(newBlue);
delete newColor;
}
}
delete N;
iType = NONE;
return color;
}
