1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
#ifndef _BSPTREE_H_
#define _BSPTREE_H_
#include "Triangle.h"
#include <list>
#include <cmath>
#include <vmmlib/vector.hpp>
class BSPTree {
private:
class Plane {
public:
Plane() : d(0) {}
Plane(const vmml::vec3f &n, float d0) : normal(n), d(d0) {}
Plane(const Triangle &t) : normal(t.getNormal()), d(t.getVertex(0).dot(normal)) {}
bool contains(const vmml::vec3f &v) const {
return (fabsf(normal.dot(v) - d) < 1E-6);
}
bool isBehind(const vmml::vec3f &v) const {
return (normal.dot(v) - d) < 0;
}
bool isInFront(const vmml::vec3f &v) const {
return (normal.dot(v) - d) > 0;
}
bool contains(const Triangle &t) const {
for(int i = 0; i < 3; ++i) {
if(!contains(t.getVertex(i)))
return false;
}
return true;
}
bool isBehind(const Triangle &t) const {
for(int i = 0; i < 3; ++i) {
if(!isBehind(t.getVertex(i)) && !contains(t.getVertex(i)))
return false;
}
return true;
}
bool isInFront(const Triangle &t) const {
for(int i = 0; i < 3; ++i) {
if(!isInFront(t.getVertex(i)) && !contains(t.getVertex(i)))
return false;
}
return true;
}
const vmml::vec3f& getNormal() const {
return normal;
}
vmml::vec3f intersection(const vmml::vec3f &p, const vmml::vec3f &dir) const;
void partition(const Triangle &t, std::list<Triangle> *front, std::list<Triangle> *back) const;
private:
vmml::vec3f normal;
float d;
};
public:
BSPTree(const std::list<Triangle> &triangles);
BSPTree(const BSPTree &tree) : frontTree(0), backTree(0) {
*this = tree;
}
virtual ~BSPTree() {
if(frontTree)
delete frontTree;
if(backTree)
delete backTree;
}
BSPTree& operator=(const BSPTree &tree);
template<typename T>
void visit(const T& visitor, const vmml::vec3f &p) {
doVisit<const T>(visitor, p);
}
template<typename T>
void visit(T& visitor, const vmml::vec3f &p) {
doVisit(visitor, p);
}
private:
Plane plane;
std::list<Triangle> triangles;
BSPTree *frontTree, *backTree;
template<typename T>
void doVisit(T& visitor, const vmml::vec3f &p) {
if(plane.isBehind(p)) {
if(frontTree)
frontTree->visit(visitor, p);
for(std::list<Triangle>::iterator t = triangles.begin(); t != triangles.end(); ++t) {
visitor(*t);
}
if(backTree)
backTree->visit(visitor, p);
}
else {
if(backTree)
backTree->visit(visitor, p);
for(std::list<Triangle>::iterator t = triangles.begin(); t != triangles.end(); ++t) {
visitor(*t);
}
if(frontTree)
frontTree->visit(visitor, p);
}
}
static vmml::vec3f findCenter(const std::list<Triangle> &triangles);
static const Triangle* findNearestTriangle(const std::list<Triangle> &triangles, const vmml::vec3f &v);
};
#endif /* _BSPTREE_H_ */
|
