| 1 |
greg |
1.1 |
/* Copyright (c) 1987 Regents of the University of California */
|
| 2 |
|
|
|
| 3 |
|
|
#ifndef lint
|
| 4 |
|
|
static char SCCSid[] = "$SunId$ LBL";
|
| 5 |
|
|
#endif
|
| 6 |
|
|
|
| 7 |
|
|
/*
|
| 8 |
|
|
* bbox.c - routines for bounding box computation.
|
| 9 |
|
|
*
|
| 10 |
|
|
* 8/4/87
|
| 11 |
|
|
*/
|
| 12 |
|
|
|
| 13 |
|
|
#include "standard.h"
|
| 14 |
|
|
|
| 15 |
|
|
#include "object.h"
|
| 16 |
|
|
|
| 17 |
|
|
#include "otypes.h"
|
| 18 |
|
|
|
| 19 |
|
|
#include "face.h"
|
| 20 |
|
|
|
| 21 |
|
|
#include "cone.h"
|
| 22 |
|
|
|
| 23 |
|
|
#include "instance.h"
|
| 24 |
|
|
|
| 25 |
|
|
|
| 26 |
|
|
add2bbox(o, bbmin, bbmax) /* expand bounding box to fit object */
|
| 27 |
|
|
register OBJREC *o;
|
| 28 |
|
|
FVECT bbmin, bbmax;
|
| 29 |
|
|
{
|
| 30 |
greg |
1.2 |
CONE *co;
|
| 31 |
|
|
FACE *fo;
|
| 32 |
|
|
INSTANCE *io;
|
| 33 |
greg |
1.1 |
FVECT v;
|
| 34 |
|
|
register int i, j;
|
| 35 |
|
|
|
| 36 |
|
|
switch (o->otype) {
|
| 37 |
|
|
case OBJ_SPHERE:
|
| 38 |
|
|
case OBJ_BUBBLE:
|
| 39 |
|
|
if (o->oargs.nfargs != 4)
|
| 40 |
|
|
objerror(o, USER, "bad arguments");
|
| 41 |
|
|
for (i = 0; i < 3; i++) {
|
| 42 |
|
|
VCOPY(v, o->oargs.farg);
|
| 43 |
|
|
v[i] -= o->oargs.farg[3];
|
| 44 |
|
|
point2bbox(v, bbmin, bbmax);
|
| 45 |
|
|
v[i] += 2.0 * o->oargs.farg[3];
|
| 46 |
|
|
point2bbox(v, bbmin, bbmax);
|
| 47 |
|
|
}
|
| 48 |
|
|
break;
|
| 49 |
|
|
case OBJ_FACE:
|
| 50 |
|
|
fo = getface(o);
|
| 51 |
|
|
j = fo->nv;
|
| 52 |
|
|
while (j--)
|
| 53 |
|
|
point2bbox(VERTEX(fo,j), bbmin, bbmax);
|
| 54 |
|
|
break;
|
| 55 |
|
|
case OBJ_CONE:
|
| 56 |
|
|
case OBJ_CUP:
|
| 57 |
|
|
case OBJ_CYLINDER:
|
| 58 |
|
|
case OBJ_TUBE:
|
| 59 |
|
|
case OBJ_RING:
|
| 60 |
|
|
co = getcone(o, 0);
|
| 61 |
|
|
if (o->otype != OBJ_RING)
|
| 62 |
|
|
circle2bbox(CO_P0(co), co->ad, CO_R0(co), bbmin, bbmax);
|
| 63 |
|
|
circle2bbox(CO_P1(co), co->ad, CO_R1(co), bbmin, bbmax);
|
| 64 |
|
|
break;
|
| 65 |
|
|
case OBJ_INSTANCE:
|
| 66 |
greg |
1.3 |
io = getinstance(o, IO_BOUNDS);
|
| 67 |
greg |
1.1 |
for (j = 0; j < 8; j++) {
|
| 68 |
|
|
for (i = 0; i < 3; i++) {
|
| 69 |
|
|
v[i] = io->obj->scube.cuorg[i];
|
| 70 |
|
|
if (j & 1<<i)
|
| 71 |
|
|
v[i] += io->obj->scube.cusize;
|
| 72 |
|
|
}
|
| 73 |
|
|
multp3(v, v, io->f.xfm);
|
| 74 |
|
|
point2bbox(v, bbmin, bbmax);
|
| 75 |
|
|
}
|
| 76 |
|
|
break;
|
| 77 |
|
|
}
|
| 78 |
|
|
}
|
| 79 |
|
|
|
| 80 |
|
|
|
| 81 |
|
|
point2bbox(p, bbmin, bbmax) /* expand bounding box to fit point */
|
| 82 |
|
|
register FVECT p, bbmin, bbmax;
|
| 83 |
|
|
{
|
| 84 |
|
|
register int i;
|
| 85 |
|
|
|
| 86 |
|
|
for (i = 0; i < 3; i++) {
|
| 87 |
|
|
if (p[i] < bbmin[i])
|
| 88 |
|
|
bbmin[i] = p[i];
|
| 89 |
|
|
if (p[i] > bbmax[i])
|
| 90 |
|
|
bbmax[i] = p[i];
|
| 91 |
|
|
}
|
| 92 |
|
|
}
|
| 93 |
|
|
|
| 94 |
|
|
|
| 95 |
|
|
circle2bbox(cent, norm, rad, bbmin, bbmax) /* expand bbox to fit circle */
|
| 96 |
|
|
FVECT cent, norm;
|
| 97 |
|
|
double rad;
|
| 98 |
|
|
FVECT bbmin, bbmax;
|
| 99 |
|
|
{
|
| 100 |
|
|
FVECT v1, v2;
|
| 101 |
|
|
register int i, j;
|
| 102 |
|
|
|
| 103 |
|
|
for (i = 0; i < 3; i++) {
|
| 104 |
|
|
v1[0] = v1[1] = v1[2] = 0;
|
| 105 |
|
|
v1[i] = 1.0;
|
| 106 |
|
|
fcross(v2, norm, v1);
|
| 107 |
|
|
if (normalize(v2) == 0.0)
|
| 108 |
|
|
continue;
|
| 109 |
|
|
for (j = 0; j < 3; j++)
|
| 110 |
|
|
v1[j] = cent[j] + rad*v2[j];
|
| 111 |
|
|
point2bbox(v1, bbmin, bbmax);
|
| 112 |
|
|
for (j = 0; j < 3; j++)
|
| 113 |
|
|
v1[j] = cent[j] - rad*v2[j];
|
| 114 |
|
|
point2bbox(v1, bbmin, bbmax);
|
| 115 |
|
|
}
|
| 116 |
|
|
}
|
