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/* Copyright (c) 1987 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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* bbox.c - routines for bounding box computation. |
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* |
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* 8/4/87 |
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*/ |
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#include "standard.h" |
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#include "copyright.h" |
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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 "otypes.h" |
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#include "face.h" |
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#include "cone.h" |
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#include "instance.h" |
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#include "mesh.h" |
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#include "oconv.h" |
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add2bbox(o, bbmin, bbmax) /* expand bounding box to fit object */ |
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register OBJREC *o; |
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FVECT bbmin, bbmax; |
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static void point2bbox(FVECT p, FVECT bbmin, FVECT bbmax); |
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static void circle2bbox(FVECT cent, FVECT norm, double rad, FVECT bbmin, FVECT bbmax); |
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void |
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add2bbox( /* expand bounding box to fit object */ |
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register OBJREC *o, |
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FVECT bbmin, |
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FVECT bbmax |
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) |
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{ |
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#define co ((CONE *)osp) |
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#define fo ((FACE *)osp) |
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#define io ((INSTANCE *)osp) |
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register char *osp; |
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CONE *co; |
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FACE *fo; |
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INSTANCE *io; |
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MESHINST *mi; |
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FVECT v; |
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register int i, j; |
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case OBJ_TUBE: |
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case OBJ_RING: |
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co = getcone(o, 0); |
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if (co == NULL) |
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break; |
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if (o->otype != OBJ_RING) |
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circle2bbox(CO_P0(co), co->ad, CO_R0(co), bbmin, bbmax); |
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circle2bbox(CO_P1(co), co->ad, CO_R1(co), bbmin, bbmax); |
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break; |
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case OBJ_INSTANCE: |
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io = getinstance(o, GET_BOUNDS); |
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io = getinstance(o, IO_BOUNDS); |
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for (j = 0; j < 8; j++) { |
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for (i = 0; i < 3; i++) { |
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v[i] = io->obj->scube.cuorg[i]; |
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if (j & 1<<i) |
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v[i] += io->obj->scube.cusize; |
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} |
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multp3(v, v, io->f.xfm); |
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multp3(v, v, io->x.f.xfm); |
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point2bbox(v, bbmin, bbmax); |
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} |
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break; |
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case OBJ_MESH: |
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mi = getmeshinst(o, IO_BOUNDS); |
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for (j = 0; j < 8; j++) { |
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for (i = 0; i < 3; i++) { |
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v[i] = mi->msh->mcube.cuorg[i]; |
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if (j & 1<<i) |
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v[i] += mi->msh->mcube.cusize; |
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} |
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multp3(v, v, mi->x.f.xfm); |
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point2bbox(v, bbmin, bbmax); |
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} |
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break; |
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} |
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#undef co |
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#undef fo |
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#undef io |
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} |
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point2bbox(p, bbmin, bbmax) /* expand bounding box to fit point */ |
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register FVECT p, bbmin, bbmax; |
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static void |
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point2bbox( /* expand bounding box to fit point */ |
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register FVECT p, |
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register FVECT bbmin, |
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register FVECT bbmax |
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) |
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{ |
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register int i; |
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} |
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circle2bbox(cent, norm, rad, bbmin, bbmax) /* expand bbox to fit circle */ |
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FVECT cent, norm; |
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double rad; |
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FVECT bbmin, bbmax; |
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static void |
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circle2bbox( /* expand bbox to fit circle */ |
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FVECT cent, |
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FVECT norm, |
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double rad, |
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FVECT bbmin, |
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FVECT bbmax |
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) |
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{ |
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FVECT v1, v2; |
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register int i, j; |
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double d, r; |
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register int i; |
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for (i = 0; i < 3; i++) { |
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v1[0] = v1[1] = v1[2] = 0; |
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v1[i] = 1.0; |
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fcross(v2, norm, v1); |
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if (normalize(v2) == 0.0) |
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continue; |
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for (j = 0; j < 3; j++) |
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v1[j] = cent[j] + rad*v2[j]; |
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point2bbox(v1, bbmin, bbmax); |
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for (j = 0; j < 3; j++) |
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v1[j] = cent[j] - rad*v2[j]; |
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point2bbox(v1, bbmin, bbmax); |
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r = sqrt(1. - norm[i]*norm[i]); |
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d = cent[i] + r*rad; |
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if (d > bbmax[i]) |
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bbmax[i] = d; |
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d = cent[i] - r*rad; |
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if (d < bbmin[i]) |
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bbmin[i] = d; |
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} |
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} |
