Segments CSGNode::intersectLocal(const ray& r) const{
Segments ret;
if (isLeaf){
SegmentPoint pNear, pFar;
isect i;
ray backR(r.at(-10000), r.getDirection());
if(!item->intersect(backR, i))return ret;
pNear.t = i.t - 10000;
pNear.normal = i.N;
pNear.isRight = false;
ray contiR(r.at(pNear.t+RAY_EPSILON*10),r.getDirection());
if (!item->intersect(contiR, i))pFar = pNear;
else {
pFar.t = i.t + pNear.t;
pFar.normal = i.N;
}
pFar.isRight = true;
ret.addPoint(pNear);
ret.addPoint(pFar);
return ret;
}
else {
if (!lchild || !rchild)return ret;
Segments leftSeg, rightSeg;
leftSeg = lchild->intersectLocal(r);
rightSeg = rchild->intersectLocal(r);
leftSeg.Merge(rightSeg,relation);
return leftSeg;
}
}
