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52 lines
1.9 KiB
52 lines
1.9 KiB
#ifndef BVH_H_
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#define BVH_H_
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#include <iostream>
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#include <tinynurbs/tinynurbs.h>
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//包围盒结构，存储盒子对角的两个点
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typedef struct AABB
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{
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glm::vec3 Bmin, Bmax;
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AABB()
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{
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double minNum = std::numeric_limits<double>::lowest();
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double maxNum = std::numeric_limits<double>::max();
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Bmax = glm::vec3(minNum, minNum, minNum);
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Bmin = glm::vec3(maxNum, maxNum, maxNum);
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}
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} AABB;
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// AABB包围盒的结点
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typedef struct BVH_AABB_Node
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{
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AABB bound; //包围盒边界
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std::vector<std::pair<double, double>> param; //此包围盒对应的每个参数的范围
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std::vector<struct BVH_AABB_Node *> childPtr; //把每个孩子结点指针存储到容器里
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} BVH_AABB_Node, *BVH_AABB_NodePtr;
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class BVH_AABB
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{
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public:
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unsigned int Hlevel; //递归层数
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unsigned int BranchNum; //每个结点的分支数 [BranchNum=2:曲线 || BranchNum=4:曲面]
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double sampleNum; //采样点数--越大包围盒构造越准确
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BVH_AABB_NodePtr bvh_aabb_node = NULL; // bvh树的根指针
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public:
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BVH_AABB(unsigned int Hlevel_, unsigned int BranchNum_, double sampleNum_) : Hlevel(Hlevel_), BranchNum(BranchNum_), sampleNum(sampleNum_)
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{
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bvh_aabb_node = new BVH_AABB_Node;
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std::cout << "BVH_AABB constructed correct!\n";
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};
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BVH_AABB_Node *GetNode() const
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{
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return bvh_aabb_node;
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};
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AABB UnionBound(const AABB &a, const AABB &b);
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AABB UpdateBound(const AABB &bound, const glm::vec3 &p);
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BVH_AABB_NodePtr Build_NurbsCurve(tinynurbs::RationalCurve<double> &curve, BVH_AABB_NodePtr &curNode, int curLevel, double t, double tstep);
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BVH_AABB_NodePtr Build_NurbsSurface(tinynurbs::RationalSurface<double> &surface, BVH_AABB_NodePtr &curNode, int curLevel, double u, double v, double ustep, double vstep);
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};
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#endif // !BVH_H_
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