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* |
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*/ |
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#include "sm_qtree.h" |
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|
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< |
#define SQRT3_INV 0.5773502692 |
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#define ST_NUM_ROOT_NODES 8 |
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|
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/* The base is an octahedron: Each face contains a planar quadtree. At |
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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; /* quadtree triangulation of sphere */ |
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FVECT center; /* sphere center */ |
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FVECT base[4]; /* 4 vertices on sphere that define base triangulation |
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of 4 triangles: assume cover sphere and triangles |
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are base verts (0,1,2),(0,2,3),(0,3,1), and (1,3,2) |
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*/ |
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QUADTREE root[2]; /* root[0]= top four faces, root[1]=bottom 4 faces*/ |
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FVECT center; /* sphere center */ |
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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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|
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FVECT enorms[8][3]; /* Edge normals: For plane through edge and origin*/ |
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}STREE; |
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#define ST_ROOT(s) ((s)->root) |
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#define ST_ROOT_PTR(s) (&(s)->root) |
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#define ST_NTH_ROOT(s,n) QT_NTH_CHILD(ST_ROOT(s),n) |
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#define ST_NTH_ROOT_PTR(s,n) QT_NTH_CHILD_PTR(ST_ROOT(s),n) |
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#define ST_CLEAR_ROOT(s) QT_CLEAR_CHILDREN(ST_ROOT(s)) |
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|
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#define ST_CENTER(s) ((s)->center) |
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#define ST_SET_CENTER(s,b) VCOPY(ST_CENTER(s),b) |
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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 */ |
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#define ST_ROOT(s,i) ((s)->root[ST_BASEI(i)]) /* top or bottom root*/ |
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#define ST_ROOT_PTR(s,i) (&ST_ROOT(s,i)) /* ptr to top(0)/bottom(1)root*/ |
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#define ST_TOP_ROOT(s) ((s)->root[0]) /* top root (y>0)*/ |
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#define ST_BOTTOM_ROOT(s) ((s)->root[1]) /* bottom root (y <= 0)*/ |
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#define ST_TOP_ROOT_PTR(s) (&ST_TOP_ROOT(s)) /* ptr to top root */ |
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> |
#define ST_BOTTOM_ROOT_PTR(s) (&ST_BOTTOM_ROOT(s)) /* ptr to bottom root*/ |
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> |
#define ST_NTH_ROOT(s,n) QT_NTH_CHILD(ST_ROOT(s,n),ST_INDEX(n)) |
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> |
#define ST_NTH_ROOT_PTR(s,n) QT_NTH_CHILD_PTR(ST_ROOT(s,n),ST_INDEX(n)) |
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> |
#define ST_CLEAR_ROOT(st) (ST_TOP_ROOT(st)=EMPTY,ST_BOTTOM_ROOT(st)=EMPTY) |
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> |
#define ST_INIT_ROOT(st) (QT_CLEAR_CHILDREN(ST_TOP_ROOT(st)), \ |
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> |
QT_CLEAR_CHILDREN(ST_BOTTOM_ROOT(st))) |
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#define ST_BASE(s) ((s)->base) |
44 |
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#define ST_NTH_BASE(s,n) ((s)->base[(n)]) |
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+ |
#define ST_NTH_V(s,n,i) ST_NTH_BASE(s,stBase_verts[(n)][(i)]) |
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#define ST_SET_NTH_BASE(s,n,b) VCOPY(ST_NTH_BASE(s,n),b) |
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#define ST_SET_BASE(s,b) (VCOPY(ST_NTH_BASE(s,0),(b)[0]), \ |
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VCOPY(ST_NTH_BASE(s,1),(b)[1]), \ |
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VCOPY(ST_NTH_BASE(s,2),(b)[2]), \ |
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< |
VCOPY(ST_NTH_BASE(s,3),(b)[3])) |
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> |
VCOPY(ST_NTH_BASE(s,3),(b)[3]), \ |
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VCOPY(ST_NTH_BASE(s,4),(b)[4]), \ |
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VCOPY(ST_NTH_BASE(s,5),(b)[5])) |
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|
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#define ST_CENTER(s) ((s)->center) |
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#define ST_SET_CENTER(s,b) VCOPY(ST_CENTER(s),b) |
56 |
> |
|
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> |
#define ST_NTH_PLANE(s,i) ((s)->fplane[(i)]) |
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> |
#define ST_NTH_NORM(s,i) (ST_NTH_PLANE(s,i).n) |
59 |
> |
#define ST_NTH_D(s,i) (ST_NTH_PLANE(s,i).d) |
60 |
> |
#define ST_EDGE_NORM(s,i,n) ((s)->enorms[(i)][(n)]) |
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> |
|
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#define ST_COORD(s,p,r) VSUB(r,p,ST_CENTER(s)) |
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#define ST_CLEAR_FLAGS(s) qtClearAllFlags() |
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|
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/* Point location based on coordinate signs */ |
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+ |
#define TST(p) ((p)>0.0?1:0) |
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+ |
#define stPoint_in_root(p) stlocatetbl[TST((p)[0])<<2 | (TST((p)[1])<<1) \ |
68 |
+ |
| TST((p)[2])] |
69 |
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|
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/* STREE functions |
71 |
+ |
void stInit(STREE *st,FVECT center) |
72 |
+ |
Initializes an stree structure with origin 'center': |
73 |
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Frees existing quadtrees hanging off of the roots |
74 |
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|
75 |
+ |
STREE *stAlloc(STREE *st) |
76 |
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Allocates a stree structure and creates octahedron base |
77 |
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|
78 |
< |
STREE *stInit(STREE *st) |
79 |
< |
Initialize STREE: if st = NULL, allocate a new one, else clear |
80 |
< |
return pointer to initialized structure |
78 |
> |
void stClear(STREE *st) |
79 |
> |
Frees any existing root children and clears roots |
80 |
> |
|
81 |
> |
QUADTREE stPoint_locate(STREE *st,FVECT p) |
82 |
> |
Returns quadtree leaf node containing point 'p'. |
83 |
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|
84 |
< |
QUADTREE *stPoint_locate(STREE *st,FVECT pt) |
85 |
< |
Find stree node that projection of pt on sphere falls in |
84 |
> |
int stAdd_tri(STREE *st,int id,FVECT t0,t1,t2) |
85 |
> |
Add triangle 'id' with coordinates 't0,t1,t2' to the stree: returns |
86 |
> |
FALSE on error, TRUE otherwise |
87 |
> |
|
88 |
> |
int stRemove_tri(STREE *st,int id,FVECT t0,t1,t2) |
89 |
> |
Removes triangle 'id' with coordinates 't0,t1,t2' from stree: returns |
90 |
> |
FALSE on error, TRUE otherwise |
91 |
> |
|
92 |
> |
int stTrace_ray(STREE *st,FVECT orig,dir,int (*func)(),int *arg1,*arg2) |
93 |
> |
Trace ray 'orig-dir' through stree and apply 'func(arg1,arg2)' at each |
94 |
> |
node that it intersects |
95 |
|
|
96 |
< |
stInsert_tri() |
97 |
< |
for every quadtree tri in the base- find node all leaf nodes that |
98 |
< |
tri overlaps and add tri to set. If this causes any of the nodes |
99 |
< |
to be over threshhold- split |
100 |
< |
stDelete_tri() |
56 |
< |
for every quadtree tri in the base- find node all leaf nodes that |
57 |
< |
tri overlaps. If this causes any of the nodes to be under |
58 |
< |
threshold- merge |
96 |
> |
int stApply_to_tri(STREE *st,FVECT t0,t1,t2,int (*edge_func)(), |
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> |
(*tri_func)(),int arg1,*arg2) |
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> |
Visit nodes intersected by tri 't0,t1,t2'.Apply 'edge_func(arg1,arg2,arg3)', |
99 |
> |
to those nodes intersected by edges, and interior_func to ALL nodes: |
100 |
> |
ie some Nodes will be visited more than once |
101 |
|
*/ |
60 |
– |
extern int stTri_verts[4][3]; |
61 |
– |
extern int stTri_nbrs[4][3]; |
62 |
– |
extern FVECT stDefault_base[4]; |
102 |
|
|
103 |
< |
|
103 |
> |
extern int stBase_verts[8][3]; |
104 |
|
extern STREE *stAlloc(); |
105 |
< |
extern QUADTREE *stPoint_locate_cell(); |
67 |
< |
|
105 |
> |
extern QUADTREE stPoint_locate(); |
106 |
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107 |
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108 |
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