7 |
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* |
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*/ |
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#define STR_INDEX(s) (stRoot_indices[(s)]) |
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#define STR_NTH_INDEX(s,n) (stRoot_indices[(s)][(n)]) |
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#define ST_NUM_ROOT_NODES 8 |
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+ |
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16 |
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/* The base is an octahedron: Each face contains a planar quadtree. At |
18 |
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the root level, the "top" (positive y) four faces, and bottom four faces |
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are stored together:forming two root quadtree nodes |
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*/ |
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typedef struct _STREE { |
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< |
QUADTREE root[2]; /* root[0]= top four faces, root[1]=bottom 4 faces*/ |
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> |
QUADTREE qt[2]; /* root[0]= top four faces, root[1]=bottom 4 faces*/ |
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FVECT center; /* sphere center */ |
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+ |
|
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/* will go **************************************************/ |
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FVECT base[6]; /* 6 vertices on sphere that define base octahedron: |
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in canonical form: origin(0,0,0) points (1,0,0), |
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(0,1,0),(0,0,1),(-1,0,0),(0,-1,0),(0,0,-1) */ |
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FPEQ fplane[8]; /* Face plane equations */ |
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FVECT enorms[8][3]; /* Edge normals: For plane through edge and origin*/ |
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/* gone ****************************************************************/ |
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|
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}STREE; |
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37 |
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#define ST_BASEI(n) ((n)>>2) /* root index: top or bottom */ |
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#define ST_INDEX(n) ((n) & 0x3) /* which child in root */ |
40 |
< |
#define ST_ROOT(s,i) ((s)->root[ST_BASEI(i)]) /* top or bottom root*/ |
41 |
< |
#define ST_ROOT_PTR(s,i) (&ST_ROOT(s,i)) /* ptr to top(0)/bottom(1)root*/ |
42 |
< |
#define ST_TOP_ROOT(s) ((s)->root[0]) /* top root (y>0)*/ |
43 |
< |
#define ST_BOTTOM_ROOT(s) ((s)->root[1]) /* bottom root (y <= 0)*/ |
44 |
< |
#define ST_TOP_ROOT_PTR(s) (&ST_TOP_ROOT(s)) /* ptr to top root */ |
45 |
< |
#define ST_BOTTOM_ROOT_PTR(s) (&ST_BOTTOM_ROOT(s)) /* ptr to bottom root*/ |
46 |
< |
#define ST_NTH_ROOT(s,n) QT_NTH_CHILD(ST_ROOT(s,n),ST_INDEX(n)) |
47 |
< |
#define ST_NTH_ROOT_PTR(s,n) QT_NTH_CHILD_PTR(ST_ROOT(s,n),ST_INDEX(n)) |
48 |
< |
#define ST_CLEAR_ROOT(st) (ST_TOP_ROOT(st)=EMPTY,ST_BOTTOM_ROOT(st)=EMPTY) |
49 |
< |
#define ST_INIT_ROOT(st) (QT_CLEAR_CHILDREN(ST_TOP_ROOT(st)), \ |
50 |
< |
QT_CLEAR_CHILDREN(ST_BOTTOM_ROOT(st))) |
40 |
> |
#define ST_QT(s,i) ((s)->qt[ST_BASEI(i)]) /* top or bottom root*/ |
41 |
> |
#define ST_QT_PTR(s,i) (&ST_QT(s,i)) /* ptr to top(0)/bottom(1)root*/ |
42 |
> |
#define ST_TOP_QT(s) ((s)->qt[0]) /* top root (y>0)*/ |
43 |
> |
#define ST_BOTTOM_QT(s) ((s)->qt[1]) /* bottom qt (y <= 0)*/ |
44 |
> |
#define ST_TOP_QT_PTR(s) (&ST_TOP_QT(s)) /* ptr to top qt */ |
45 |
> |
#define ST_BOTTOM_QT_PTR(s) (&ST_BOTTOM_QT(s)) /* ptr to bottom qt*/ |
46 |
> |
|
47 |
> |
|
48 |
> |
#define ST_ROOT_QT(s,n) QT_NTH_CHILD(ST_QT(s,n),ST_INDEX(n)) |
49 |
> |
|
50 |
> |
#define ST_CLEAR_QT(st) (ST_TOP_QT(st)=EMPTY,ST_BOTTOM_QT(st)=EMPTY) |
51 |
> |
#define ST_INIT_QT(st) (QT_CLEAR_CHILDREN(ST_TOP_QT(st)), \ |
52 |
> |
QT_CLEAR_CHILDREN(ST_BOTTOM_QT(st))) |
53 |
> |
|
54 |
> |
|
55 |
> |
|
56 |
> |
/* Will go *****************************************************/ |
57 |
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#define ST_BASE(s) ((s)->base) |
58 |
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#define ST_NTH_BASE(s,n) ((s)->base[(n)]) |
59 |
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#define ST_NTH_V(s,n,i) ST_NTH_BASE(s,stBase_verts[(n)][(i)]) |
64 |
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VCOPY(ST_NTH_BASE(s,3),(b)[3]), \ |
65 |
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VCOPY(ST_NTH_BASE(s,4),(b)[4]), \ |
66 |
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VCOPY(ST_NTH_BASE(s,5),(b)[5])) |
53 |
– |
|
54 |
– |
#define ST_CENTER(s) ((s)->center) |
55 |
– |
#define ST_SET_CENTER(s,b) VCOPY(ST_CENTER(s),b) |
56 |
– |
|
67 |
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#define ST_NTH_PLANE(s,i) ((s)->fplane[(i)]) |
68 |
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#define ST_NTH_NORM(s,i) (ST_NTH_PLANE(s,i).n) |
69 |
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#define ST_NTH_D(s,i) (ST_NTH_PLANE(s,i).d) |
70 |
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#define ST_EDGE_NORM(s,i,n) ((s)->enorms[(i)][(n)]) |
71 |
+ |
/* gone *****************************************************/ |
72 |
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|
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)) |
77 |
|
#define ST_CLEAR_FLAGS(s) qtClearAllFlags() |
78 |
|
|
79 |
|
/* Point location based on coordinate signs */ |
80 |
< |
#define TST(p) ((p)>0.0?1:0) |
67 |
< |
#define stPoint_in_root(p) stlocatetbl[TST((p)[0])<<2 | (TST((p)[1])<<1) \ |
68 |
< |
| TST((p)[2])] |
80 |
> |
#define stLocate_root(p) (((p)[2]>0.0?0:4)|((p)[1]>0.0?0:2)|((p)[0]>0.0?0:1)) |
81 |
|
|
82 |
+ |
#define ST_CLIP_VERTS 16 |
83 |
|
/* STREE functions |
84 |
|
void stInit(STREE *st,FVECT center) |
85 |
|
Initializes an stree structure with origin 'center': |