| 7 |
|
* |
| 8 |
|
*/ |
| 9 |
|
|
| 10 |
– |
#include "sm_qtree.h" |
| 10 |
|
|
| 11 |
< |
#define SQRT3_INV 0.5773502692 |
| 11 |
> |
#define ST_NUM_ROOT_NODES 8 |
| 12 |
|
|
| 13 |
+ |
/* The base is an octahedron: Each face contains a planar quadtree. At |
| 14 |
+ |
the root level, the "top" (positive y) four faces, and bottom four faces |
| 15 |
+ |
are stored together:forming two root quadtree nodes |
| 16 |
+ |
*/ |
| 17 |
|
|
| 18 |
|
typedef struct _STREE { |
| 19 |
< |
QUADTREE root; /* quadtree triangulation of sphere */ |
| 20 |
< |
FVECT center; /* sphere center */ |
| 21 |
< |
FVECT base[4]; /* 4 vertices on sphere that define base triangulation |
| 22 |
< |
of 4 triangles: assume cover sphere and triangles |
| 23 |
< |
are base verts (0,1,2),(0,2,3),(0,3,1), and (1,3,2) |
| 24 |
< |
*/ |
| 19 |
> |
QUADTREE root[2]; /* root[0]= top four faces, root[1]=bottom 4 faces*/ |
| 20 |
> |
FVECT center; /* sphere center */ |
| 21 |
> |
FVECT base[6]; /* 6 vertices on sphere that define base octahedron: |
| 22 |
> |
in canonical form: origin(0,0,0) points (1,0,0), |
| 23 |
> |
(0,1,0),(0,0,1),(-1,0,0),(0,-1,0),(0,0,-1) */ |
| 24 |
> |
FPEQ fplane[8]; /* Face plane equations */ |
| 25 |
> |
|
| 26 |
> |
FVECT enorms[8][3]; /* Edge normals: For plane through edge and origin*/ |
| 27 |
|
}STREE; |
| 28 |
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|
| 24 |
– |
#define ST_ROOT(s) ((s)->root) |
| 25 |
– |
#define ST_NTH_ROOT(s,n) QT_NTH_CHILD(ST_ROOT(s),n) |
| 26 |
– |
#define ST_NTH_ROOT_PTR(s,n) QT_NTH_CHILD_PTR(ST_ROOT(s),n) |
| 27 |
– |
#define ST_CLEAR_ROOT(s) QT_CLEAR_CHILDREN(ST_ROOT(s)) |
| 29 |
|
|
| 30 |
< |
#define ST_CENTER(s) ((s)->center) |
| 31 |
< |
#define ST_SET_CENTER(s,b) VCOPY(ST_CENTER(s),b) |
| 30 |
> |
#define ST_BASEI(n) ((n)>>2) /* root index: top or bottom */ |
| 31 |
> |
#define ST_INDEX(n) ((n) & 0x3) /* which child in root */ |
| 32 |
> |
#define ST_ROOT(s,i) ((s)->root[ST_BASEI(i)]) /* top or bottom root*/ |
| 33 |
> |
#define ST_ROOT_PTR(s,i) (&ST_ROOT(s,i)) /* ptr to top(0)/bottom(1)root*/ |
| 34 |
> |
#define ST_TOP_ROOT(s) ((s)->root[0]) /* top root (y>0)*/ |
| 35 |
> |
#define ST_BOTTOM_ROOT(s) ((s)->root[1]) /* bottom root (y <= 0)*/ |
| 36 |
> |
#define ST_TOP_ROOT_PTR(s) (&ST_TOP_ROOT(s)) /* ptr to top root */ |
| 37 |
> |
#define ST_BOTTOM_ROOT_PTR(s) (&ST_BOTTOM_ROOT(s)) /* ptr to bottom root*/ |
| 38 |
> |
#define ST_NTH_ROOT(s,n) QT_NTH_CHILD(ST_ROOT(s,n),ST_INDEX(n)) |
| 39 |
> |
#define ST_NTH_ROOT_PTR(s,n) QT_NTH_CHILD_PTR(ST_ROOT(s,n),ST_INDEX(n)) |
| 40 |
> |
#define ST_CLEAR_ROOT(st) (ST_TOP_ROOT(st)=EMPTY,ST_BOTTOM_ROOT(st)=EMPTY) |
| 41 |
> |
#define ST_INIT_ROOT(st) (QT_CLEAR_CHILDREN(ST_TOP_ROOT(st)), \ |
| 42 |
> |
QT_CLEAR_CHILDREN(ST_BOTTOM_ROOT(st))) |
| 43 |
|
#define ST_BASE(s) ((s)->base) |
| 44 |
|
#define ST_NTH_BASE(s,n) ((s)->base[(n)]) |
| 45 |
+ |
#define ST_NTH_V(s,n,i) ST_NTH_BASE(s,stBase_verts[(n)][(i)]) |
| 46 |
|
#define ST_SET_NTH_BASE(s,n,b) VCOPY(ST_NTH_BASE(s,n),b) |
| 47 |
|
#define ST_SET_BASE(s,b) (VCOPY(ST_NTH_BASE(s,0),(b)[0]), \ |
| 48 |
|
VCOPY(ST_NTH_BASE(s,1),(b)[1]), \ |
| 49 |
|
VCOPY(ST_NTH_BASE(s,2),(b)[2]), \ |
| 50 |
< |
VCOPY(ST_NTH_BASE(s,3),(b)[3])) |
| 51 |
< |
#define ST_COORD(s,p,r) VSUB(r,p,ST_CENTER(s)) |
| 50 |
> |
VCOPY(ST_NTH_BASE(s,3),(b)[3]), \ |
| 51 |
> |
VCOPY(ST_NTH_BASE(s,4),(b)[4]), \ |
| 52 |
> |
VCOPY(ST_NTH_BASE(s,5),(b)[5])) |
| 53 |
|
|
| 54 |
< |
/* STREE functions |
| 54 |
> |
#define ST_CENTER(s) ((s)->center) |
| 55 |
> |
#define ST_SET_CENTER(s,b) VCOPY(ST_CENTER(s),b) |
| 56 |
|
|
| 57 |
+ |
#define ST_NTH_PLANE(s,i) ((s)->fplane[(i)]) |
| 58 |
+ |
#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)]) |
| 61 |
|
|
| 62 |
< |
STREE *stInit(STREE *st) |
| 63 |
< |
Initialize STREE: if st = NULL, allocate a new one, else clear |
| 45 |
< |
return pointer to initialized structure |
| 62 |
> |
#define ST_COORD(s,p,r) VSUB(r,p,ST_CENTER(s)) |
| 63 |
> |
#define ST_CLEAR_FLAGS(s) qtClearAllFlags() |
| 64 |
|
|
| 65 |
< |
QUADTREE *stPoint_locate(STREE *st,FVECT pt) |
| 66 |
< |
Find stree node that projection of pt on sphere falls in |
| 65 |
> |
/* Point location based on coordinate signs */ |
| 66 |
> |
#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])] |
| 69 |
|
|
| 70 |
< |
stInsert_tri() |
| 71 |
< |
for every quadtree tri in the base- find node all leaf nodes that |
| 72 |
< |
tri overlaps and add tri to set. If this causes any of the nodes |
| 73 |
< |
to be over threshhold- split |
| 54 |
< |
stDelete_tri() |
| 55 |
< |
for every quadtree tri in the base- find node all leaf nodes that |
| 56 |
< |
tri overlaps. If this causes any of the nodes to be under |
| 57 |
< |
threshold- merge |
| 58 |
< |
*/ |
| 59 |
< |
extern int stTri_verts[4][3]; |
| 60 |
< |
extern FVECT stDefault_base[4]; |
| 70 |
> |
/* STREE functions |
| 71 |
> |
void stInit(STREE *st,FVECT center) |
| 72 |
> |
Initializes an stree structure with origin 'center': |
| 73 |
> |
Frees existing quadtrees hanging off of the roots |
| 74 |
|
|
| 75 |
+ |
STREE *stAlloc(STREE *st) |
| 76 |
+ |
Allocates a stree structure and creates octahedron base |
| 77 |
|
|
| 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 |
|
|
| 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 |
+ |
int stApply_to_tri(STREE *st,FVECT t0,t1,t2,int (*edge_func)(), |
| 97 |
+ |
(*tri_func)(),int arg1,*arg2) |
| 98 |
+ |
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 |
+ |
*/ |
| 102 |
+ |
|
| 103 |
+ |
extern int stBase_verts[8][3]; |
| 104 |
+ |
extern STREE *stAlloc(); |
| 105 |
+ |
extern QUADTREE stPoint_locate(); |
| 106 |
|
|
| 107 |
|
|
| 108 |
|
|
