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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
| 6 |
|
| 7 |
/* |
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* sm_qtree.c: adapted from octree.c from radiance code |
| 9 |
*/ |
| 10 |
/* |
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* octree.c - routines dealing with octrees and cubes. |
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* |
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* 7/28/85 |
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*/ |
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|
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#include "standard.h" |
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|
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#include "sm_geom.h" |
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#include "sm_qtree.h" |
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#include "object.h" |
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|
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QUADTREE *quad_block[QT_MAX_BLK]; /* our quadtree */ |
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static QUADTREE quad_free_list = EMPTY; /* freed octree nodes */ |
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static QUADTREE treetop = 0; /* next free node */ |
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|
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|
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|
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QUADTREE |
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qtAlloc() /* allocate a quadtree */ |
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{ |
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register QUADTREE freet; |
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|
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if ((freet = quad_free_list) != EMPTY) |
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{ |
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quad_free_list = QT_NTH_CHILD(freet, 0); |
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return(freet); |
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} |
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freet = treetop; |
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if (QT_BLOCK_INDEX(freet) == 0) |
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{ |
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if (QT_BLOCK(freet) >= QT_MAX_BLK) |
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return(EMPTY); |
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if ((quad_block[QT_BLOCK(freet)] = (QUADTREE *)malloc( |
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(unsigned)QT_BLOCK_SIZE*4*sizeof(QUADTREE))) == NULL) |
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return(EMPTY); |
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} |
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treetop += 4; |
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return(freet); |
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} |
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|
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|
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qtFree(qt) /* free a quadtree */ |
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register QUADTREE qt; |
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{ |
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register int i; |
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|
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if (!QT_IS_TREE(qt)) |
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{ |
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qtfreeleaf(qt); |
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return; |
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} |
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for (i = 0; i < 4; i++) |
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qtFree(QT_NTH_CHILD(qt, i)); |
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QT_NTH_CHILD(qt, 0) = quad_free_list; |
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quad_free_list = qt; |
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} |
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|
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|
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qtDone() /* free EVERYTHING */ |
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{ |
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register int i; |
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|
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for (i = 0; i < QT_MAX_BLK; i++) |
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{ |
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free((char *)quad_block[i], |
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(unsigned)QT_BLOCK_SIZE*4*sizeof(QUADTREE)); |
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quad_block[i] = NULL; |
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} |
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quad_free_list = EMPTY; |
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treetop = 0; |
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} |
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|
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QUADTREE |
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qtCompress(qt) /* recursively combine nodes */ |
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register QUADTREE qt; |
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{ |
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register int i; |
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register QUADTREE qres; |
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|
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if (!QT_IS_TREE(qt)) /* not a tree */ |
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return(qt); |
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qres = QT_NTH_CHILD(qt,0) = qtCompress(QT_NTH_CHILD(qt,0)); |
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for (i = 1; i < 4; i++) |
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if((QT_NTH_CHILD(qt,i) = qtCompress(QT_NTH_CHILD(qt,i))) != qres) |
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qres = qt; |
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if(!QT_IS_TREE(qres)) |
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{ /* all were identical leaves */ |
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QT_NTH_CHILD(qt,0) = quad_free_list; |
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quad_free_list = qt; |
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} |
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return(qres); |
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} |
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|
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QUADTREE |
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qtPoint_locate(qtptr,v1,v2,v3,pt,type,which,p0,p1,p2) |
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QUADTREE *qtptr; |
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FVECT v1,v2,v3; |
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FVECT pt; |
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char *type,*which; |
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FVECT p0,p1,p2; |
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{ |
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char d,w; |
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int i; |
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QUADTREE *child; |
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QUADTREE qt; |
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FVECT a,b,c; |
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FVECT t1,t2,t3; |
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|
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/* Determine if point lies within pyramid (and therefore |
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inside a spherical quadtree cell):GT_INTERIOR, on one of the |
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pyramid sides (and on cell edge):GT_EDGE(1,2 or 3), |
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or on pyramid vertex (and on cell vertex):GT_VERTEX(1,2, or 3). |
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For each triangle edge: compare the |
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point against the plane formed by the edge and the view center |
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*/ |
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d = test_single_point_against_spherical_tri(v1,v2,v3,pt,&w); |
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|
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/* Not in this triangle */ |
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if(!d) |
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{ |
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if(which) |
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*which = 0; |
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return(EMPTY); |
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} |
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|
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/* Will return lowest level triangle containing point: It the |
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point is on an edge or vertex: will return first associated |
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triangle encountered in the child traversal- the others can |
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be derived using triangle adjacency information |
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*/ |
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|
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if(QT_IS_TREE(*qtptr)) |
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{ |
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qtSubdivide_tri(v1,v2,v3,a,b,c); |
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child = QT_NTH_CHILD_PTR(*qtptr,0); |
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if(!QT_IS_EMPTY(*child)) |
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{ |
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qt = qtPoint_locate(child,v1,a,c,pt,type,which,p0,p1,p2); |
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if(!QT_IS_EMPTY(qt)) |
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return(qt); |
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} |
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child = QT_NTH_CHILD_PTR(*qtptr,1); |
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if(!QT_IS_EMPTY(*child)) |
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{ |
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qt = qtPoint_locate(child,a,b,c,pt,type,which,p0,p1,p2); |
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if(!QT_IS_EMPTY(qt)) |
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return(qt); |
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} |
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child = QT_NTH_CHILD_PTR(*qtptr,2); |
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if(!QT_IS_EMPTY(*child)) |
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{ |
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qt = qtPoint_locate(child,a,v2,b,pt,type,which,p0,p1,p2); |
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if(!QT_IS_EMPTY(qt)) |
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return(qt); |
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} |
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child = QT_NTH_CHILD_PTR(*qtptr,3); |
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if(!QT_IS_EMPTY(*child)) |
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{ |
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qt = qtPoint_locate(child,c,b,v3,pt,type,which,p0,p1,p2); |
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if(!QT_IS_EMPTY(qt)) |
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return(qt); |
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} |
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} |
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else |
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if(!QT_IS_EMPTY(*qtptr)) |
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{ |
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/* map GT_VERTEX,GT_EDGE,GT_FACE GT_INTERIOR of pyramid to |
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spherical triangle primitives |
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*/ |
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if(type) |
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*type = d; |
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if(which) |
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*which = w; |
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VCOPY(p0,v1); |
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VCOPY(p1,v2); |
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VCOPY(p2,v3); |
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return(*qtptr); |
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} |
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return(EMPTY); |
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} |
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|
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int |
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qtPoint_in_tri(qtptr,v0,v1,v2,pt,type,which) |
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QUADTREE *qtptr; |
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FVECT v0,v1,v2; |
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FVECT pt; |
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char *type,*which; |
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{ |
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QUADTREE qt; |
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OBJECT os[MAXSET+1],*optr; |
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char d,w; |
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int i,id; |
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FVECT p0,p1,p2; |
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|
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qt = qtPoint_locate(qtptr,v0,v1,v2,pt,type,which,p0,p1,p2); |
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if(QT_IS_EMPTY(qt)) |
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return(EMPTY); |
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|
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/* Get the set */ |
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qtgetset(os,qt); |
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for (i = QT_SET_CNT(os),optr = QT_SET_PTR(os); i > 0; i--) |
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{ |
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/* Find the triangle that pt falls in (NOTE:FOR now return first 1) */ |
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id = QT_SET_NEXT_ELEM(optr); |
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qtTri_verts_from_id(id,p0,p1,p2); |
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d = test_single_point_against_spherical_tri(p0,p1,p2,pt,&w); |
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if(d) |
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{ |
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if(type) |
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*type = d; |
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if(which) |
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*which = w; |
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return(id); |
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} |
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} |
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return(EMPTY); |
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} |
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|
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QUADTREE |
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qtSubdivide(qtptr) |
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QUADTREE *qtptr; |
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{ |
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QUADTREE node; |
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node = qtAlloc(); |
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QT_CLEAR_CHILDREN(node); |
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*qtptr = node; |
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return(node); |
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} |
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|
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|
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QUADTREE |
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qtSubdivide_nth_child(qt,n) |
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QUADTREE qt; |
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int n; |
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{ |
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QUADTREE node; |
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|
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node = qtSubdivide(&(QT_NTH_CHILD(qt,n))); |
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|
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return(node); |
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} |
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|
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/* for triangle v1-v2-v3- returns a,b,c: children are: |
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|
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v3 0: v1,a,c |
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/\ 1: a,b,c |
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/3 \ 2: a,v2,b |
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c/____\b 3: c,b,v3 |
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/\ /\ |
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/0 \1 /2 \ |
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v1/____\/____\v2 |
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a |
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*/ |
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|
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qtSubdivide_tri(v1,v2,v3,a,b,c) |
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FVECT v1,v2,v3; |
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FVECT a,b,c; |
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{ |
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EDGE_MIDPOINT_VEC3(a,v1,v2); |
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normalize(a); |
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EDGE_MIDPOINT_VEC3(b,v2,v3); |
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normalize(b); |
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EDGE_MIDPOINT_VEC3(c,v3,v1); |
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normalize(c); |
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} |
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|
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qtNth_child_tri(v1,v2,v3,a,b,c,i,r1,r2,r3) |
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FVECT v1,v2,v3; |
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FVECT a,b,c; |
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int i; |
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FVECT r1,r2,r3; |
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{ |
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VCOPY(r1,a); VCOPY(r2,b); VCOPY(r3,c); |
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switch(i){ |
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case 0: |
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VCOPY(r2,r1); |
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VCOPY(r1,v1); |
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break; |
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case 1: |
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break; |
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case 2: |
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VCOPY(r3,r2); |
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VCOPY(r2,v2); |
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break; |
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case 3: |
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VCOPY(r1,r3); |
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VCOPY(r3,v3); |
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break; |
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} |
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} |
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|
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/* Add triangle "id" to all leaf level cells that are children of |
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quadtree pointed to by "qtptr" with cell vertices "t1,t2,t3" |
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that it overlaps (vertex and edge adjacencies do not count |
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as overlapping). If the addition of the triangle causes the cell to go over |
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threshold- the cell is split- and the triangle must be recursively inserted |
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into the new child cells: it is assumed that "v1,v2,v3" are normalized |
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*/ |
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|
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int |
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qtAdd_tri(qtptr,id,t1,t2,t3,v1,v2,v3,n) |
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QUADTREE *qtptr; |
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int id; |
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FVECT t1,t2,t3; |
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FVECT v1,v2,v3; |
| 316 |
int n; |
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{ |
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|
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char test; |
| 320 |
int i,index; |
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FVECT a,b,c; |
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OBJECT os[MAXSET+1],*optr; |
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QUADTREE qt; |
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int found; |
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FVECT r1,r2,r3; |
| 326 |
|
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/* test if triangle (t1,t2,t3) overlaps cell triangle (v1,v2,v3) */ |
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test = spherical_tri_intersect(t1,t2,t3,v1,v2,v3); |
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|
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/* If triangles do not overlap: done */ |
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if(!test) |
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return(FALSE); |
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found = 0; |
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|
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/* if this is tree: recurse */ |
| 336 |
if(QT_IS_TREE(*qtptr)) |
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{ |
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n++; |
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qtSubdivide_tri(v1,v2,v3,a,b,c); |
| 340 |
found |= qtAdd_tri(QT_NTH_CHILD_PTR(*qtptr,0),id,t1,t2,t3,v1,a,c,n); |
| 341 |
found |= qtAdd_tri(QT_NTH_CHILD_PTR(*qtptr,1),id,t1,t2,t3,a,b,c,n); |
| 342 |
found |= qtAdd_tri(QT_NTH_CHILD_PTR(*qtptr,2),id,t1,t2,t3,a,v2,b,n); |
| 343 |
found |= qtAdd_tri(QT_NTH_CHILD_PTR(*qtptr,3),id,t1,t2,t3,c,b,v3,n); |
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|
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#if 0 |
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if(!found) |
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{ |
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#ifdef TEST_DRIVER |
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HANDLE_ERROR("qtAdd_tri():Found in parent but not children\n"); |
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#else |
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eputs("qtAdd_tri():Found in parent but not children\n"); |
| 352 |
#endif |
| 353 |
} |
| 354 |
#endif |
| 355 |
} |
| 356 |
else |
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{ |
| 358 |
/* If this leave node emptry- create a new set */ |
| 359 |
if(QT_IS_EMPTY(*qtptr)) |
| 360 |
{ |
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*qtptr = qtaddelem(*qtptr,id); |
| 362 |
#if 0 |
| 363 |
{ |
| 364 |
int k; |
| 365 |
qtgetset(os,*qtptr); |
| 366 |
printf("\n%d:\n",os[0]); |
| 367 |
for(k=1; k <= os[0];k++) |
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printf("%d ",os[k]); |
| 369 |
printf("\n"); |
| 370 |
} |
| 371 |
#endif |
| 372 |
/* |
| 373 |
os[0] = 0; |
| 374 |
insertelem(os,id); |
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qt = fullnode(os); |
| 376 |
*qtptr = qt; |
| 377 |
*/ |
| 378 |
} |
| 379 |
else |
| 380 |
{ |
| 381 |
qtgetset(os,*qtptr); |
| 382 |
/* If the set is too large: subdivide */ |
| 383 |
if(QT_SET_CNT(os) < QT_SET_THRESHOLD) |
| 384 |
{ |
| 385 |
*qtptr = qtaddelem(*qtptr,id); |
| 386 |
#if 0 |
| 387 |
{ |
| 388 |
int k; |
| 389 |
qtgetset(os,*qtptr); |
| 390 |
printf("\n%d:\n",os[0]); |
| 391 |
for(k=1; k <= os[0];k++) |
| 392 |
printf("%d ",os[k]); |
| 393 |
printf("\n"); |
| 394 |
} |
| 395 |
#endif |
| 396 |
/* |
| 397 |
insertelem(os,id); |
| 398 |
*qtptr = fullnode(os); |
| 399 |
*/ |
| 400 |
} |
| 401 |
else |
| 402 |
{ |
| 403 |
if (n < QT_MAX_LEVELS) |
| 404 |
{ |
| 405 |
/* If set size exceeds threshold: subdivide cell and |
| 406 |
reinsert set tris into cell |
| 407 |
*/ |
| 408 |
n++; |
| 409 |
qtfreeleaf(*qtptr); |
| 410 |
qtSubdivide(qtptr); |
| 411 |
found = qtAdd_tri(qtptr,id,t1,t2,t3,v1,v2,v3,n); |
| 412 |
#if 0 |
| 413 |
if(!found) |
| 414 |
{ |
| 415 |
#ifdef TEST_DRIVER |
| 416 |
HANDLE_ERROR("qtAdd_tri():Found in parent but not children\n"); |
| 417 |
#else |
| 418 |
eputs("qtAdd_tri():Found in parent but not children\n"); |
| 419 |
#endif |
| 420 |
} |
| 421 |
#endif |
| 422 |
for(optr = &(os[1]),i = QT_SET_CNT(os); i > 0; i--) |
| 423 |
{ |
| 424 |
id = QT_SET_NEXT_ELEM(optr); |
| 425 |
qtTri_verts_from_id(id,r1,r2,r3); |
| 426 |
found=qtAdd_tri(qtptr,id,r1,r2,r3,v1,v2,v3,n); |
| 427 |
#ifdef DEBUG |
| 428 |
if(!found) |
| 429 |
eputs("qtAdd_tri():Reinsert-in parent but not children\n"); |
| 430 |
#endif |
| 431 |
} |
| 432 |
} |
| 433 |
else |
| 434 |
if(QT_SET_CNT(os) < QT_MAX_SET) |
| 435 |
{ |
| 436 |
*qtptr = qtaddelem(*qtptr,id); |
| 437 |
#if 0 |
| 438 |
{ |
| 439 |
int k; |
| 440 |
qtgetset(os,*qtptr); |
| 441 |
printf("\n%d:\n",os[0]); |
| 442 |
for(k=1; k <= os[0];k++) |
| 443 |
printf("%d ",os[k]); |
| 444 |
printf("\n"); |
| 445 |
} |
| 446 |
#endif |
| 447 |
/* |
| 448 |
insertelem(os,id); |
| 449 |
*qtptr = fullnode(os); |
| 450 |
*/ |
| 451 |
} |
| 452 |
else |
| 453 |
{ |
| 454 |
#ifdef DEBUG |
| 455 |
eputs("qtAdd_tri():two many levels\n"); |
| 456 |
#endif |
| 457 |
return(FALSE); |
| 458 |
} |
| 459 |
} |
| 460 |
} |
| 461 |
} |
| 462 |
return(TRUE); |
| 463 |
} |
| 464 |
|
| 465 |
|
| 466 |
int |
| 467 |
qtApply_to_tri_cells(qtptr,t1,t2,t3,v1,v2,v3,func,arg) |
| 468 |
QUADTREE *qtptr; |
| 469 |
FVECT t1,t2,t3; |
| 470 |
FVECT v1,v2,v3; |
| 471 |
int (*func)(); |
| 472 |
char *arg; |
| 473 |
{ |
| 474 |
char test; |
| 475 |
FVECT a,b,c; |
| 476 |
|
| 477 |
/* test if triangle (t1,t2,t3) overlaps cell triangle (v1,v2,v3) */ |
| 478 |
test = spherical_tri_intersect(t1,t2,t3,v1,v2,v3); |
| 479 |
|
| 480 |
/* If triangles do not overlap: done */ |
| 481 |
if(!test) |
| 482 |
return(FALSE); |
| 483 |
|
| 484 |
/* if this is tree: recurse */ |
| 485 |
if(QT_IS_TREE(*qtptr)) |
| 486 |
{ |
| 487 |
qtSubdivide_tri(v1,v2,v3,a,b,c); |
| 488 |
qtApply_to_tri_cells(QT_NTH_CHILD_PTR(*qtptr,0),t1,t2,t3,v1,a,c,func,arg); |
| 489 |
qtApply_to_tri_cells(QT_NTH_CHILD_PTR(*qtptr,1),t1,t2,t3,a,b,c,func,arg); |
| 490 |
qtApply_to_tri_cells(QT_NTH_CHILD_PTR(*qtptr,2),t1,t2,t3,a,v2,b,func,arg); |
| 491 |
qtApply_to_tri_cells(QT_NTH_CHILD_PTR(*qtptr,3),t1,t2,t3,c,b,v3,func,arg); |
| 492 |
} |
| 493 |
else |
| 494 |
return(func(qtptr,arg)); |
| 495 |
} |
| 496 |
|
| 497 |
|
| 498 |
int |
| 499 |
qtRemove_tri(qtptr,id,t1,t2,t3,v1,v2,v3) |
| 500 |
QUADTREE *qtptr; |
| 501 |
int id; |
| 502 |
FVECT t1,t2,t3; |
| 503 |
FVECT v1,v2,v3; |
| 504 |
{ |
| 505 |
|
| 506 |
char test; |
| 507 |
int i; |
| 508 |
FVECT a,b,c; |
| 509 |
OBJECT os[MAXSET+1]; |
| 510 |
|
| 511 |
/* test if triangle (t1,t2,t3) overlaps cell triangle (v1,v2,v3) */ |
| 512 |
test = spherical_tri_intersect(t1,t2,t3,v1,v2,v3); |
| 513 |
|
| 514 |
/* If triangles do not overlap: done */ |
| 515 |
if(!test) |
| 516 |
return(FALSE); |
| 517 |
|
| 518 |
/* if this is tree: recurse */ |
| 519 |
if(QT_IS_TREE(*qtptr)) |
| 520 |
{ |
| 521 |
qtSubdivide_tri(v1,v2,v3,a,b,c); |
| 522 |
qtRemove_tri(QT_NTH_CHILD_PTR(*qtptr,0),id,t1,t2,t3,v1,a,c); |
| 523 |
qtRemove_tri(QT_NTH_CHILD_PTR(*qtptr,1),id,t1,t2,t3,a,b,c); |
| 524 |
qtRemove_tri(QT_NTH_CHILD_PTR(*qtptr,2),id,t1,t2,t3,a,v2,b); |
| 525 |
qtRemove_tri(QT_NTH_CHILD_PTR(*qtptr,3),id,t1,t2,t3,c,b,v3); |
| 526 |
} |
| 527 |
else |
| 528 |
{ |
| 529 |
if(QT_IS_EMPTY(*qtptr)) |
| 530 |
{ |
| 531 |
#ifdef DEBUG |
| 532 |
eputs("qtRemove_tri(): triangle not found\n"); |
| 533 |
#endif |
| 534 |
} |
| 535 |
/* remove id from set */ |
| 536 |
else |
| 537 |
{ |
| 538 |
qtgetset(os,*qtptr); |
| 539 |
if(!inset(os,id)) |
| 540 |
{ |
| 541 |
#ifdef DEBUG |
| 542 |
eputs("qtRemove_tri(): tri not in set\n"); |
| 543 |
#endif |
| 544 |
} |
| 545 |
else |
| 546 |
{ |
| 547 |
*qtptr = qtdelelem(*qtptr,id); |
| 548 |
#if 0 |
| 549 |
{ |
| 550 |
int k; |
| 551 |
if(!QT_IS_EMPTY(*qtptr)) |
| 552 |
{qtgetset(os,*qtptr); |
| 553 |
printf("\n%d:\n",os[0]); |
| 554 |
for(k=1; k <= os[0];k++) |
| 555 |
printf("%d ",os[k]); |
| 556 |
printf("\n"); |
| 557 |
} |
| 558 |
|
| 559 |
} |
| 560 |
#endif |
| 561 |
} |
| 562 |
} |
| 563 |
} |
| 564 |
return(TRUE); |
| 565 |
} |
