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DP Tool Club 8
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RADIANCE
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BBOX.C
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C/C++ Source or Header
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1993-10-07
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2KB
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117 lines
/* Copyright (c) 1987 Regents of the University of California */
#ifndef lint
static char SCCSid[] = "@(#)bbox.c 2.1 11/12/91 LBL";
#endif
/*
* bbox.c - routines for bounding box computation.
*
* 8/4/87
*/
#include "standard.h"
#include "object.h"
#include "otypes.h"
#include "face.h"
#include "cone.h"
#include "instance.h"
add2bbox(o, bbmin, bbmax) /* expand bounding box to fit object */
register OBJREC *o;
FVECT bbmin, bbmax;
{
CONE *co;
FACE *fo;
INSTANCE *io;
FVECT v;
register int i, j;
switch (o->otype) {
case OBJ_SPHERE:
case OBJ_BUBBLE:
if (o->oargs.nfargs != 4)
objerror(o, USER, "bad arguments");
for (i = 0; i < 3; i++) {
VCOPY(v, o->oargs.farg);
v[i] -= o->oargs.farg[3];
point2bbox(v, bbmin, bbmax);
v[i] += 2.0 * o->oargs.farg[3];
point2bbox(v, bbmin, bbmax);
}
break;
case OBJ_FACE:
fo = getface(o);
j = fo->nv;
while (j--)
point2bbox(VERTEX(fo,j), bbmin, bbmax);
break;
case OBJ_CONE:
case OBJ_CUP:
case OBJ_CYLINDER:
case OBJ_TUBE:
case OBJ_RING:
co = getcone(o, 0);
if (o->otype != OBJ_RING)
circle2bbox(CO_P0(co), co->ad, CO_R0(co), bbmin, bbmax);
circle2bbox(CO_P1(co), co->ad, CO_R1(co), bbmin, bbmax);
break;
case OBJ_INSTANCE:
io = getinstance(o, IO_BOUNDS);
for (j = 0; j < 8; j++) {
for (i = 0; i < 3; i++) {
v[i] = io->obj->scube.cuorg[i];
if (j & 1<<i)
v[i] += io->obj->scube.cusize;
}
multp3(v, v, io->x.f.xfm);
point2bbox(v, bbmin, bbmax);
}
break;
}
}
point2bbox(p, bbmin, bbmax) /* expand bounding box to fit point */
register FVECT p, bbmin, bbmax;
{
register int i;
for (i = 0; i < 3; i++) {
if (p[i] < bbmin[i])
bbmin[i] = p[i];
if (p[i] > bbmax[i])
bbmax[i] = p[i];
}
}
circle2bbox(cent, norm, rad, bbmin, bbmax) /* expand bbox to fit circle */
FVECT cent, norm;
double rad;
FVECT bbmin, bbmax;
{
FVECT v1, v2;
register int i, j;
for (i = 0; i < 3; i++) {
v1[0] = v1[1] = v1[2] = 0;
v1[i] = 1.0;
fcross(v2, norm, v1);
if (normalize(v2) == 0.0)
continue;
for (j = 0; j < 3; j++)
v1[j] = cent[j] + rad*v2[j];
point2bbox(v1, bbmin, bbmax);
for (j = 0; j < 3; j++)
v1[j] = cent[j] - rad*v2[j];
point2bbox(v1, bbmin, bbmax);
}
}