21 |
|
|
22 |
|
typedef struct _STREE { |
23 |
|
QUADTREE qt[2]; /* root[0]= top four faces, root[1]=bottom 4 faces*/ |
24 |
– |
FVECT center; /* sphere center */ |
24 |
|
|
26 |
– |
/* will go **************************************************/ |
27 |
– |
FVECT base[6]; /* 6 vertices on sphere that define base octahedron: |
28 |
– |
in canonical form: origin(0,0,0) points (1,0,0), |
29 |
– |
(0,1,0),(0,0,1),(-1,0,0),(0,-1,0),(0,0,-1) */ |
30 |
– |
FPEQ fplane[8]; /* Face plane equations */ |
31 |
– |
|
32 |
– |
FVECT enorms[8][3]; /* Edge normals: For plane through edge and origin*/ |
33 |
– |
/* gone ****************************************************************/ |
34 |
– |
|
25 |
|
}STREE; |
26 |
|
|
27 |
|
|
34 |
|
#define ST_TOP_QT_PTR(s) (&ST_TOP_QT(s)) /* ptr to top qt */ |
35 |
|
#define ST_BOTTOM_QT_PTR(s) (&ST_BOTTOM_QT(s)) /* ptr to bottom qt*/ |
36 |
|
|
37 |
< |
|
37 |
> |
#define ST_NTH_V(s,n,w) (stDefault_base[stBase_verts[n][w]]) |
38 |
|
#define ST_ROOT_QT(s,n) QT_NTH_CHILD(ST_QT(s,n),ST_INDEX(n)) |
39 |
|
|
40 |
|
#define ST_CLEAR_QT(st) (ST_TOP_QT(st)=EMPTY,ST_BOTTOM_QT(st)=EMPTY) |
41 |
|
#define ST_INIT_QT(st) (QT_CLEAR_CHILDREN(ST_TOP_QT(st)), \ |
42 |
|
QT_CLEAR_CHILDREN(ST_BOTTOM_QT(st))) |
43 |
|
|
54 |
– |
|
55 |
– |
|
56 |
– |
/* Will go *****************************************************/ |
57 |
– |
#define ST_BASE(s) ((s)->base) |
58 |
– |
#define ST_NTH_BASE(s,n) ((s)->base[(n)]) |
59 |
– |
#define ST_NTH_V(s,n,i) ST_NTH_BASE(s,stBase_verts[(n)][(i)]) |
60 |
– |
#define ST_SET_NTH_BASE(s,n,b) VCOPY(ST_NTH_BASE(s,n),b) |
61 |
– |
#define ST_SET_BASE(s,b) (VCOPY(ST_NTH_BASE(s,0),(b)[0]), \ |
62 |
– |
VCOPY(ST_NTH_BASE(s,1),(b)[1]), \ |
63 |
– |
VCOPY(ST_NTH_BASE(s,2),(b)[2]), \ |
64 |
– |
VCOPY(ST_NTH_BASE(s,3),(b)[3]), \ |
65 |
– |
VCOPY(ST_NTH_BASE(s,4),(b)[4]), \ |
66 |
– |
VCOPY(ST_NTH_BASE(s,5),(b)[5])) |
67 |
– |
#define ST_NTH_PLANE(s,i) ((s)->fplane[(i)]) |
68 |
– |
#define ST_NTH_NORM(s,i) (ST_NTH_PLANE(s,i).n) |
69 |
– |
#define ST_NTH_D(s,i) (ST_NTH_PLANE(s,i).d) |
70 |
– |
#define ST_EDGE_NORM(s,i,n) ((s)->enorms[(i)][(n)]) |
71 |
– |
/* gone *****************************************************/ |
72 |
– |
|
73 |
– |
#define ST_CENTER(s) ((s)->center) |
74 |
– |
#define ST_SET_CENTER(s,b) VCOPY(ST_CENTER(s),b) |
75 |
– |
|
76 |
– |
#define ST_COORD(s,p,r) VSUB(r,p,ST_CENTER(s)) |
44 |
|
#define ST_CLEAR_FLAGS(s) qtClearAllFlags() |
45 |
|
|
46 |
|
/* Point location based on coordinate signs */ |
47 |
|
#define stLocate_root(p) (((p)[2]>0.0?0:4)|((p)[1]>0.0?0:2)|((p)[0]>0.0?0:1)) |
48 |
+ |
#define stClear(st) stInit(st) |
49 |
|
|
50 |
|
#define ST_CLIP_VERTS 16 |
51 |
|
/* STREE functions |
56 |
|
STREE *stAlloc(STREE *st) |
57 |
|
Allocates a stree structure and creates octahedron base |
58 |
|
|
91 |
– |
void stClear(STREE *st) |
92 |
– |
Frees any existing root children and clears roots |
59 |
|
|
60 |
|
QUADTREE stPoint_locate(STREE *st,FVECT p) |
61 |
|
Returns quadtree leaf node containing point 'p'. |
80 |
|
*/ |
81 |
|
|
82 |
|
extern int stBase_verts[8][3]; |
83 |
+ |
extern FVECT stDefault_base[6]; |
84 |
|
extern STREE *stAlloc(); |
85 |
|
extern QUADTREE stPoint_locate(); |
86 |
|
|