Color refraction_shader::Shade( const Scene &scene, const HitInfo &hit ) const{
if(gen >= max_depth)
return scene.envmap->Shade(hit.ray);
if( mat->emission != black )
if (_ray.type == indirect_ray) //turnign off the light
return black;
else
return mat->emission; //this si direct sample, so return illum of the light
if(mat->reflectivity != black && _ray.type == indirect_ray)
return black;
Vec3 O = _ray.origin;
Vec3 P = hit.point;
Vec3 N = hit.normal;
Vec3 E = Unit( O - P );
Vec3 R = Unit( ( 2.0 * ( E * N ) ) * N - E );
if( E * N < 0.0 ) N = -N; //flip the normal to make it point into the space of the ray origin
if(mat->translucency != black ){
Ray rr = obj->getRefracetedRay(_ray,P,N);
if(rr.direction!=Vec3(0,0,0))
return scene.Trace(rr)*mat->translucency
+ scene.Trace(obj->getReflectedRay(_ray,P,N))*(white-mat->translucency);
else return black;//this is TIR even after 4 level of internal reflections
}
unsigned k = 1,n = 1;
if(gen == 1 ){ // rays of tree depth = 1
n = numDirectRays;
k = numIndirectRays;
}
Color color = mat->diffuse * mat->ambient;
Sample *dSamples = new Sample[n*n];
unsigned numSamples;
HitInfo dHit;
Ray dRay,iRay;
unsigned Y = scene.NumLights() ;
for( unsigned i = 0; i < Y; i++ ){
const Object *light = scene.GetLight(i);
numSamples = light->GetSamples (hit.point, hit.normal, dSamples, n);
//#pragma omp parallel for
for(unsigned j=0;j<numSamples ;j++){
dRay.origin = hit.point + Unit(N)*10E-4;
dRay.direction = Unit( dSamples[j].P - hit.point );
dRay.generation = gen + 1; //next level in tree
dHit.ray = dRay;
dHit.distance = Infinity;
dRay.type = _ray.type;
if(scene.Cast(dRay,dHit))
if( dHit.object == light){
color += max( 0, dRay.direction*Unit(N) )*
mat->diffuse*
light->material->emission*dSamples[j].w/Pi;
if( mat->Phong_exp !=0 && mat->specular != black)
//this si handling specularity
color += (white-mat->reflectivity)*
pow( max( dRay.direction*R,0), mat->Phong_exp) *
mat->specular*light->material->emission*dSamples[j].w;
}
else if(dHit.object->material->translucency != black){
//hit a tranclusive surface, so cast the transmitted ray
Ray rr = dHit.object->getRefracetedRay(dRay,dHit.point, dHit.normal);
HitInfo rrHit;
rrHit.distance = Infinity;
rrHit.ray = rr;
if(scene.Cast(rr,rrHit))
if(rrHit.object == light)
color += max( 0, dRay.direction*Unit(N) )*
mat->diffuse*
light->material->emission*dSamples[j].w/Pi;
if( mat->Phong_exp !=0 && mat->specular != black)
color += (white-mat->reflectivity)*
pow( max( dRay.direction*R,0), mat->Phong_exp) *
mat->specular*light->material->emission*dSamples[j].w;
}
}
}
if(mat->reflectivity == black){
//sample hmisphere (stratified)
if(max_depth > 2){
Sample* iSamples = new Sample[k*k];
numSamples = SampleProjectedHemisphere (hit.point, hit.normal, iSamples, k);
//#pragma omp parallel for
for(unsigned j = 0; j < numSamples ;j++){
iRay.origin = hit.point + Unit(N)*10E-4;
iRay.from = obj;
iRay.direction = Unit( hit.point - iSamples[j].P );
iRay.generation = gen+ 1;
iRay.type = indirect_ray;
color += (mat->diffuse*iSamples[j].w*scene.Trace(iRay))/TwoPi;
}
delete [] iSamples;
iSamples = NULL;
}
}
else{
Ray rr;
rr.origin = P+ N*10E-4;
rr.direction = R;
rr.from = obj;
rr.ignore = NULL;
rr.generation = gen+1;
color = color*(white - mat->reflectivity);
color += mat->reflectivity*scene.Trace(rr);
}
delete [] dSamples;
dSamples = NULL;
return color;
}
Color basic_shader::Shade( const Scene &scene, const HitInfo &hit ) const
{
Ray ray;
Ray reflectionRay;
Ray refractedRay;
Ray secondaryRefractedRay;
HitInfo otherhit;
HitInfo refractionHit;
static const double epsilon = 1.0E-6;
if( Emitter( hit.object ) ) return hit.object->material->emission;
Material *mat = hit.object->material;
Color diffuse = mat->diffuse;
Color specular = mat->specular;
Color color = mat->ambient * diffuse;
Vec3 O = hit.ray.origin;
Vec3 P = hit.point;
Vec3 N = hit.normal;
Vec3 E = Unit( O - P );
Vec3 R = Unit( ( 2.0 * ( E * N ) ) * N - E );
Color r = mat->reflectivity;
double e = mat->Phong_exp;
double k = mat->ref_index;
Color t = mat->translucency;
if(hit.object->Inside(P)){
P = P + epsilon*N;
}
if( E * N < 0.0 ) N = -N; // Flip the normal if necessary.
//get the attentuation
double attenuation;
double lightDistance;
Vec3 lightVector;
double diffuseFactor;
double specularFactor;
Color diffuseColor = Color();
Color specularColor = Color();
Color finalColor;
Color colorWithLighting;
Color reflectedColor;
Color refractedColor;
Vec3 currentR;
double shadowFactor = 0;
bool objectWasHit = false;
int numGridVals = 30;
float numSamples = 5;
int totalNumGridVals = numGridVals*numGridVals*numSamples;
int totalArrayValues = totalNumGridVals*2;
float totalGridVals = numGridVals;
float currentXvalue;
float currentYvalue;
float interval = 2.0f/totalGridVals;
float currentDist;
bool posZinHemisphere,negZinHemisphere;
int currentInd1,currentInd2;
float randomX,randomY;
float currentPosZvalue,currentNegZvalue;
//Vec3 currentNormal = Vec3(0.0f,0.0f,1.0f);
Vec3 currentNormal = N;
float dotProdPosZ,dotProdNegZ,dotProdXYpart;
Vec3 positiveZvector;
Vec3 negativeZvector;
int numLightsHit = 0;
/*
Surface Area of sphere from each patch P is approximately area(P)*(1/z') where z' is taken at the center
This comes from the fact that the surface area is integral_P (1/z)
*/
float minZvalue=sqrt(interval)*sqrt(2-interval);;
//used to calculate surface area
float centerXvalue,centerYvalue,centerZvalue,approxSurfaceArea;
//temp variable. default emission of the light blocks
Color defaultEmission = Color(1.0,1.0,1.0);
double emissionFactor = 30.0;
Color posZpatchValue = Color();
Color negZpatchValue = Color();
Color posZpatchSpecValue = Color();
Color negZpatchSpecValue = Color();
double radius,patchFormFactor;
Vec3 otherNormal;
float currentEnergy = 0;
for(int xInd = 0; xInd < numGridVals; xInd++){
for(int yInd = 0; yInd < numGridVals; yInd++){
centerXvalue = -1 + interval*xInd + interval*0.5;
centerYvalue = -1 + interval*yInd + interval*0.5;
currentDist = centerXvalue*centerXvalue + centerYvalue*centerYvalue;
centerZvalue = sqrt(1-currentDist);
if(centerZvalue < minZvalue){
centerZvalue = minZvalue;
}
approxSurfaceArea = interval*interval*(1.0f/centerZvalue);
posZpatchValue = Color();
negZpatchValue = Color();
for(int sampleInd = 0; sampleInd < numSamples; sampleInd++){
randomX = (double)rand() / RAND_MAX;
randomY = (double)rand() / RAND_MAX;
currentXvalue = -1+interval*xInd + interval*randomX;
currentYvalue = -1+interval*yInd + interval*randomY;
currentDist = currentXvalue*currentXvalue + currentYvalue*currentYvalue;
posZinHemisphere = false;
negZinHemisphere = false;
currentInd1 = (xInd*numGridVals + yInd)*numSamples + sampleInd;
currentInd2 = currentInd1 + totalNumGridVals;
//makes sure it is inside the unit disk
if(currentDist <= 1){
currentPosZvalue = sqrt(1-currentDist);
currentNegZvalue = -currentPosZvalue;
dotProdXYpart = currentNormal.x*currentXvalue + currentNormal.y*currentYvalue;
dotProdPosZ = currentNormal.z*currentPosZvalue + dotProdXYpart;
dotProdNegZ = currentNormal.z*currentNegZvalue + dotProdXYpart;
posZinHemisphere = (dotProdPosZ >=0);
negZinHemisphere = (dotProdNegZ >=0);
}
if(posZinHemisphere){
positiveZvector = Vec3(currentXvalue,currentYvalue,currentPosZvalue);
//light ray to case to determine occulsion
ray.origin = P;
ray.direction = positiveZvector;
HitInfo objectHit;
objectHit.distance = Infinity;
shadowFactor = 1;
if(scene.Cast(ray,objectHit) ){
if(objectHit.object != NULL){
Vec3 LightPos = objectHit.point;
if(LightPos.z > 12.0){
lightVector = LightPos - P;
numLightsHit = numLightsHit + 1;
radius = Length(lightVector);
otherNormal = Unit(objectHit.normal);
lightVector = Unit(lightVector);
//this is the current patches approximation of F_ij
//patchFormFactor = ((abs(lightVector*currentNormal))*(abs(-1*lightVector*otherNormal)))/(Pi*radius*radius);
patchFormFactor = ((lightVector*currentNormal)*(-1*lightVector*otherNormal))/(Pi*radius*radius);
patchFormFactor = max(0,patchFormFactor);
//printf("radius: %f\n",radius);
currentEnergy = currentEnergy + emissionFactor*patchFormFactor;
diffuseColor = diffuseColor + GetDiffuseColor(lightVector,N,defaultEmission,diffuse);
}
}
}
}
if(negZinHemisphere){
negativeZvector = Vec3(currentXvalue,currentYvalue,currentNegZvalue);
//printf("(x,y,z)=(%f,%f,%f)\n",gridXvalues[currentInd2],gridYvalues[currentInd2],gridZvalues[currentInd2]);
//light ray to case to determine occulsion
ray.origin = P;
ray.direction = negativeZvector;
HitInfo objectHit;
objectHit.distance = Infinity;
shadowFactor = 1;
if(scene.Cast(ray,objectHit) ){
if(objectHit.object != NULL){
Vec3 LightPos = objectHit.point;
if(LightPos.z > 12.0){
lightVector = LightPos - P;
numLightsHit = numLightsHit + 1;
radius = Length(lightVector);
otherNormal = Unit(objectHit.normal);
lightVector = Unit(lightVector);
//this is the current patches approximation of F_ij
//patchFormFactor = ((abs(lightVector*currentNormal))*(abs(-1*lightVector*otherNormal)))/(Pi*radius*radius);
patchFormFactor = ((lightVector*currentNormal)*(-1*lightVector*otherNormal))/(Pi*radius*radius);
patchFormFactor = max(0,patchFormFactor);
currentEnergy = currentEnergy + emissionFactor*patchFormFactor;
diffuseColor = diffuseColor + GetDiffuseColor(lightVector,N,defaultEmission,diffuse);
//negZpatchValue = negZpatchValue + GetDiffuseColor(lightVector,N,defaultEmission,diffuse);
}
}
}
}
}
//diffuseColor = diffuseColor + (posZpatchValue/numSamples)*approxSurfaceArea;
//diffuseColor = diffuseColor + (negZpatchValue/numSamples)*approxSurfaceArea;
//printf("Approx Surface Area:%f\n",approxSurfaceArea);
//diffuseColor = diffuseColor + posZpatchValue;
//diffuseColor = diffuseColor + negZpatchValue;
if(diffuseColor.blue > 0.5 || diffuseColor.green > 0.5 || diffuseColor.red > 0.5){
//printf("Current Diffuse Color: (%f,%f,%f)\n",diffuseColor.blue,diffuseColor.green,diffuseColor.red);
}
}
}
//makes sure to include the light vectors in the calculations
for( unsigned i = 0; i < scene.NumLights(); i++ )
{
const Object *light = scene.GetLight(i);
Color emission = light->material->emission;
AABB box = GetBox( *light );
Vec3 LightPos( Center( box ) );
//gets the light Vector
lightVector = LightPos - P;
lightDistance = Length(lightVector);
Vec3 unitLightVector = Unit(lightVector);
//gets the attenuation factor
attenuation = 1/(attenuation_a + attenuation_b*lightDistance + attenuation_c*lightDistance*lightDistance);
float dotProd = currentNormal.x*unitLightVector.x + currentNormal.y*unitLightVector.y + currentNormal.z*unitLightVector.z;
//light vector in unit hemipshere
if(dotProd >= 0){
//light ray to case to determine occulsion
ray.origin = P;
ray.direction = unitLightVector;
HitInfo objectHit;
objectHit.distance = Infinity;
if(scene.Cast(ray,objectHit) ){
if(objectHit.object != NULL){
Vec3 LightPos = objectHit.point;
if(LightPos.z > 12.0){
numLightsHit = numLightsHit + 1;
lightVector = LightPos - P;
//diffuseColor = diffuseColor + GetDiffuseColor(lightVector,N,defaultEmission,diffuse);
radius = Length(lightVector);
otherNormal = Unit(objectHit.normal);
lightVector = Unit(lightVector);
//this is the current patches approximation of F_ij
//patchFormFactor = ((abs(lightVector*currentNormal))*(abs(-1*lightVector*otherNormal)))/(Pi*radius*radius);
patchFormFactor = ((lightVector*currentNormal)*(-1*lightVector*otherNormal))/(Pi*radius*radius);
patchFormFactor = max(0,patchFormFactor);
currentEnergy = currentEnergy + emissionFactor*patchFormFactor;
diffuseColor = diffuseColor + GetDiffuseColor(lightVector,N,defaultEmission,diffuse);
}
}
}
}
}
diffuseColor = currentEnergy*defaultEmission;
//diffuseColor = diffuseColor/12.0;
float numLights = numLightsHit;
//diffuseColor = diffuseColor/(numLights*Pi);
if(numLightsHit > 1){
//printf("Number of Lights Hit:%d\n",numLightsHit);
//printf("Original Color: (%f,%f,%f)\n",diffuse.blue,diffuse.green,diffuse.red);
//printf("Diffuse Color: (%f,%f,%f)\n\n",diffuseColor.blue,diffuseColor.green,diffuseColor.red);
}
//colorWithLighting = color + diffuseColor*diffuse + specularColor*specular;
//colorWithLighting = diffuseColor*diffuse;
colorWithLighting = diffuseColor*diffuse + diffuse*0.4;
//set variables for reflection
reflectionRay.origin = P;
reflectionRay.direction = R;
reflectionRay.generation = hit.ray.generation + 1;
reflectedColor = Color();
//set variables for refraction
refractedRay.origin = P-epsilon*N;
Vec3 refractionDir = RefractionDirection(1.0,k,E,N);
refractedRay.direction = refractionDir; //for refraction
refractedRay.generation = hit.ray.generation + 1;
refractedColor = Color();
refractionHit.distance = Infinity;
//only do refraction if the transluency is greater than zero
// this is an optimization so unnecessary refractions are not calculated
if( (t.red + t.green + t.blue) > epsilon){
if(scene.Cast(refractedRay,refractionHit)){
bool insideMaterial = false;
Vec3 currentNormal;
Vec3 previousRefractedDirection;
do{
currentNormal = Unit(refractionHit.normal);
previousRefractedDirection = refractedRay.direction;
refractedRay.direction = RefractionDirection(k,1.0,-1*refractedRay.direction,-1*currentNormal);
if(Length(refractedRay.direction) < epsilon){
insideMaterial = true;
refractionHit.distance = Infinity;
refractedRay.origin = refractionHit.point - epsilon*currentNormal;
refractedRay.direction = Unit( ( 2.0 * ( previousRefractedDirection * currentNormal ) ) * (-1*currentNormal) + previousRefractedDirection );
if(!scene.Cast(refractedRay,refractionHit)){
insideMaterial = false;
}
}else{
refractedRay.origin = refractionHit.point + epsilon*currentNormal;
insideMaterial = false;
}
}while(insideMaterial);
refractedRay.generation = hit.ray.generation + 1;
//now do refraction
refractedColor = scene.Trace(refractedRay);
}
}
//do the reflection
//only do reflection if the reflectance is greater than zero
// this is an optimization so unnecessary reflections are not calculated
if( (r.red + r.green + r.blue) > epsilon){
reflectedColor = scene.Trace(reflectionRay);
}
//printf("diffuseColor: (%f,%f,%f)\n",colorWithLighting.red,colorWithLighting.green,colorWithLighting.blue);
//now combine calculated color with reflected color
//finalColor = (-1*t + Color(1.0,1.0,1.0))*(colorWithLighting + r*reflectedColor) + t*refractedColor;
return colorWithLighting;
//return finalColor;
}
