bool Grid::intersect(const Ray &r, Hit &h, float tmin)
{
//Prepare the Material objects
Vec3f diffuseColor(1, 1, 1);
Vec3f specularColor(0, 0, 0);
float exponent = 1;
Vec3f reflectiveColor(0, 0, 0);
Vec3f transparentColor(0, 0, 0);
float indexOfRefraction = 1;
PhongMaterial *m = new PhongMaterial(diffuseColor, specularColor, exponent,
reflectiveColor, transparentColor, indexOfRefraction);
//Start to do DDA
MarchingInfo mi;
initializeRayMarch(mi, r, tmin);
bool hitSomething = false;
int i, j, k;
do {
mi.getIndices(i, j, k);
printf("The current point is:%d,%d,%d\n", i, j, k);
if (mObjects[offset(i, j, k)].getNumObjects() > 0) {
h.set(mi.get_tmin(), m, mi.getNormal(), r);
return true;
}
mi.nextCell();
} while(i < mXSize && j < mYSize && k < mZSize);
return false;
}
bool Grid::intersect(const Ray &r, Hit &h, float tmin)
{
MarchingInfo march;
initialRayMarch(march,r,tmin);
int currentI = march.GetI();
int currentJ = march.GetJ();
int currentK = march.GetK();
float currentT = march.GetT();
int numObjects;
//Object3DVector currentVector; 绝对不能新建一个Object3DVector，然后把isOpaque的值赋给这个Object3DVector，因为当这个函数结束时，会把Object3DVector销毁，对应的指针指向的对象也会被销毁。
//当然还有一种方法是定义一个Object3DVector指针
//printf("i:%d j:%d currentI:%d currentJ:%d currentK:%d\n",i,j,currentI,currentJ,currentK);
Object3DVector isAlreadyIntersect;
while(currentI>=0 && currentI<nx && currentJ>=0 && currentJ<ny && currentK>=0 && currentK<nz)
{
RayTracingStats::IncrementNumGridCellsTraversed();
Object3DVector* currentVector = &isOpaque[currentI][currentJ][currentK];
numObjects = currentVector->getNumObjects();
//printf("%d %d %d\n",currentI,currentJ,currentK);
for(int i=0; i<numObjects; ++i)
{
//already intersected object don't need intersect again
if(isAlreadyIntersect.isInside(currentVector->getObject(i)))
continue;
RayTracingStats::IncrementNumIntersections();
currentVector->getObject(i)->intersect(r,h,tmin);
isAlreadyIntersect.addObject(currentVector->getObject(i));
}
if(h.getMaterial()!=NULL && h.getT()>=currentT && h.getT()<=march.GetNext_x() && h.getT()<=march.GetNext_y() && h.getT()<=march.GetNext_z())
{
return true;
}
march.nextCell();
currentI = march.GetI();
currentJ = march.GetJ();
currentK = march.GetK();
currentT = march.GetT(); //折射或反射，shadow时，光线圆点会在grid内
}
numObjects = others.getNumObjects();
for(int i=0; i<numObjects; i++)
{
others.getObject(i)->intersect(r,h,tmin);
}
if(h.getMaterial()!=NULL) //这里有问题，因为如果没有和平面相交的话，h的material也有可能不是null
return true;
return false;
}
bool Grid::shadowIntersect(const Ray &r, Hit &h, float tmin)
{
MarchingInfo march;
initialRayMarch(march,r,tmin);
int currentI = march.GetI();
int currentJ = march.GetJ();
int currentK = march.GetK();
float currentT = march.GetT();
int numObjects;
Object3DVector isAlreadyIntersect;
while(currentI>=0 && currentI<nx && currentJ>=0 && currentJ<ny && currentK>=0 && currentK<nz)
{
RayTracingStats::IncrementNumGridCellsTraversed();
Object3DVector ¤tVector = isOpaque[currentI][currentJ][currentK];
numObjects = currentVector.getNumObjects();
for(int i=0; i<numObjects; ++i)
{
if(isAlreadyIntersect.isInside(currentVector.getObject(i)))
continue;
RayTracingStats::IncrementNumIntersections();
if(currentVector.getObject(i)->intersect(r,h,tmin))
return true;
isAlreadyIntersect.addObject(currentVector.getObject(i));
}
march.nextCell();
currentI = march.GetI();
currentJ = march.GetJ();
currentK = march.GetK();
currentT = march.GetT(); //折射或反射，shadow时，光线圆点会在grid内
}
numObjects = others.getNumObjects();
for(int i=0; i<numObjects; i++)
{
if(others.getObject(i)->intersect(r,h,tmin))
return true;
}
return false;
}
