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#ifndef lint
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static const char RCSid[] = "$Id: bbox.c,v 2.6 2005/06/14 17:10:06 greg Exp $";
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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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#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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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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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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switch (o->otype) {
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case OBJ_SPHERE:
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case OBJ_BUBBLE:
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if (o->oargs.nfargs != 4)
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objerror(o, USER, "bad arguments");
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for (i = 0; i < 3; i++) {
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VCOPY(v, o->oargs.farg);
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v[i] -= o->oargs.farg[3];
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point2bbox(v, bbmin, bbmax);
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v[i] += 2.0 * o->oargs.farg[3];
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point2bbox(v, bbmin, bbmax);
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}
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break;
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case OBJ_FACE:
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fo = getface(o);
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j = fo->nv;
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while (j--)
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point2bbox(VERTEX(fo,j), bbmin, bbmax);
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break;
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case OBJ_CONE:
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case OBJ_CUP:
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case OBJ_CYLINDER:
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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, 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->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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}
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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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for (i = 0; i < 3; i++) {
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if (p[i] < bbmin[i])
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bbmin[i] = p[i];
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if (p[i] > bbmax[i])
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bbmax[i] = p[i];
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}
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}
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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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double d, r;
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register int i;
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for (i = 0; i < 3; i++) {
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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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}
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