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/* Copyright (c) 1988 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* o_instance.c - routines for creating octrees for other octrees. |
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* |
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* 11/11/88 |
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* o_instance.c - routines for creating octrees for other octrees |
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*/ |
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#include "standard.h" |
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#include "object.h" |
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#include "octree.h" |
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#include "instance.h" |
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#include "mesh.h" |
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#include "plocate.h" |
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/* |
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*/ |
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o_instance(o, cu) /* determine if cubes intersect */ |
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OBJREC *o; |
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CUBE *cu; |
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static int o_cube(CUBE *cu1, FULLXF *fxf, CUBE *cu); |
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static int |
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o_cube( /* determine if cubes intersect */ |
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CUBE *cu1, |
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FULLXF *fxf, |
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CUBE *cu |
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) |
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{ |
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static int vstart[4] = {0, 3, 5, 6}; |
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FVECT cumin, cumax; |
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FVECT vert[8]; |
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FVECT v1, v2; |
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register INSTANCE *in; |
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int vloc, vout; |
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register int i, j; |
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/* get octree arguments */ |
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in = getinstance(o, GET_BOUNDS); |
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/* check if cube vertex in octree */ |
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for (j = 0; j < 3; j++) |
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cumax[j] = (cumin[j] = in->obj->scube.cuorg[j]) + |
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in->obj->scube.cusize; |
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cumax[j] = (cumin[j] = cu1->cuorg[j]) + cu1->cusize; |
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vloc = ABOVE | BELOW; |
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vout = 0; |
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for (i = 0; i < 8; i++) { |
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if (i & 1<<j) |
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v1[j] += cu->cusize; |
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} |
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multp3(v2, v1, in->b.xfm); |
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if (j = plocate(v2, cumin, cumax)) |
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multp3(v2, v1, fxf->b.xfm); |
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if ( (j = plocate(v2, cumin, cumax)) ) |
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vout++; |
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vloc &= j; |
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} |
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if (vout == 0) /* all inside */ |
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return(2); |
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return(O_IN); |
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if (vout < 8) /* some inside */ |
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return(1); |
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return(O_HIT); |
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if (vloc) /* all to one side */ |
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return(0); |
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return(O_MISS); |
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/* octree vertices in cube? */ |
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for (j = 0; j < 3; j++) |
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cumax[j] = (cumin[j] = cu->cuorg[j]) + cu->cusize; |
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vloc = ABOVE | BELOW; |
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for (i = 0; i < 8; i++) { |
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for (j = 0; j < 3; j++) { |
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v1[j] = in->obj->scube.cuorg[j]; |
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v1[j] = cu1->cuorg[j]; |
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if (i & 1<<j) |
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v1[j] += in->obj->scube.cusize; |
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v1[j] += cu1->cusize; |
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} |
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multp3(vert[i], v1, in->f.xfm); |
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if (j = plocate(vert[i], cumin, cumax)) |
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multp3(vert[i], v1, fxf->f.xfm); |
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if ( (j = plocate(vert[i], cumin, cumax)) ) |
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vloc &= j; |
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else |
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return(1); /* vertex inside */ |
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return(O_HIT); /* vertex inside */ |
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} |
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if (vloc) /* all to one side */ |
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return(0); |
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return(O_MISS); |
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/* check edges */ |
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for (i = 0; i < 4; i++) |
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for (j = 0; j < 3; j++) { |
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VCOPY(v1, vert[vstart[i]]); |
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VCOPY(v2, vert[vstart[i] ^ 1<<j]); |
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if (clip(v1, v2, cumin, cumax)) |
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return(1); /* edge inside */ |
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return(O_HIT); /* edge inside */ |
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} |
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return(0); /* no intersection */ |
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return(O_MISS); /* no intersection */ |
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} |
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/* XXX o_instance() is extern, but not declared in any header file */ |
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int |
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o_instance( /* determine if instance intersects */ |
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OBJREC *o, |
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CUBE *cu |
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) |
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{ |
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INSTANCE *ins; |
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/* get octree bounds */ |
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ins = getinstance(o, IO_BOUNDS); |
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/* call o_cube to do the work */ |
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return(o_cube(&ins->obj->scube, &ins->x, cu)); |
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} |
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/* XXX o_mesh() is extern, but not declared in any header file */ |
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int |
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o_mesh( /* determine if mesh intersects */ |
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OBJREC *o, |
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CUBE *cu |
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) |
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{ |
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MESHINST *mip; |
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/* get mesh bounds */ |
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mip = getmeshinst(o, IO_BOUNDS); |
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/* call o_cube to do the work */ |
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return(o_cube(&mip->msh->mcube, &mip->x, cu)); |
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} |
