| 1 |
greg |
1.1 |
/* Copyright (c) 1988 Regents of the University of California */ |
| 2 |
|
|
|
| 3 |
|
|
#ifndef lint |
| 4 |
|
|
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
|
|
#endif |
| 6 |
|
|
|
| 7 |
|
|
/* |
| 8 |
|
|
* o_instance.c - routines for computing ray intersections with octrees. |
| 9 |
|
|
* |
| 10 |
|
|
* 11/11/88 |
| 11 |
|
|
*/ |
| 12 |
|
|
|
| 13 |
|
|
#include "ray.h" |
| 14 |
|
|
|
| 15 |
|
|
#include "instance.h" |
| 16 |
|
|
|
| 17 |
|
|
|
| 18 |
|
|
o_instance(o, r) /* compute ray intersection with octree */ |
| 19 |
|
|
OBJREC *o; |
| 20 |
|
|
register RAY *r; |
| 21 |
|
|
{ |
| 22 |
|
|
extern long nrays; |
| 23 |
|
|
RAY rcont; |
| 24 |
|
|
register INSTANCE *in; |
| 25 |
|
|
register int i; |
| 26 |
|
|
/* get the octree */ |
| 27 |
|
|
in = getinstance(o, GET_ALL); |
| 28 |
|
|
/* copy old ray */ |
| 29 |
|
|
bcopy(r, &rcont, sizeof(RAY)); |
| 30 |
|
|
/* transform it */ |
| 31 |
|
|
rcont.rno = nrays; |
| 32 |
|
|
rcont.ro = NULL; |
| 33 |
|
|
rcont.rot = FHUGE; |
| 34 |
|
|
rcont.rno = nrays; |
| 35 |
|
|
multp3(rcont.rorg, r->rorg, in->b.xfm); |
| 36 |
|
|
multv3(rcont.rdir, r->rdir, in->b.xfm); |
| 37 |
|
|
for (i = 0; i < 3; i++) |
| 38 |
|
|
rcont.rdir[i] /= in->b.sca; |
| 39 |
|
|
/* trace it */ |
| 40 |
|
|
if (!localhit(&rcont, &in->obj->scube)) |
| 41 |
|
|
return(0); /* missed */ |
| 42 |
|
|
if (rcont.rot * in->f.sca >= r->rot) |
| 43 |
|
|
return(0); /* not close enough */ |
| 44 |
greg |
1.4 |
|
| 45 |
|
|
if (o->omod != OVOID) { /* if we have modifier, use it */ |
| 46 |
greg |
1.1 |
r->ro = o; |
| 47 |
greg |
1.4 |
r->rofs = 1.0; setident4(r->rofx); |
| 48 |
|
|
r->robs = 1.0; setident4(r->robx); |
| 49 |
|
|
} else { /* else use theirs */ |
| 50 |
greg |
1.1 |
r->ro = rcont.ro; |
| 51 |
greg |
1.3 |
multmat4(r->rofx, rcont.rofx, in->f.xfm); |
| 52 |
|
|
r->rofs = rcont.rofs * in->f.sca; |
| 53 |
greg |
1.2 |
multmat4(r->robx, in->b.xfm, rcont.robx); |
| 54 |
|
|
r->robs = in->b.sca * rcont.robs; |
| 55 |
greg |
1.1 |
} |
| 56 |
|
|
/* transform it back */ |
| 57 |
|
|
r->rot = rcont.rot * in->f.sca; |
| 58 |
|
|
multp3(r->rop, rcont.rop, in->f.xfm); |
| 59 |
|
|
multv3(r->ron, rcont.ron, in->f.xfm); |
| 60 |
|
|
for (i = 0; i < 3; i++) |
| 61 |
|
|
r->ron[i] /= in->f.sca; |
| 62 |
|
|
r->rod = rcont.rod; |
| 63 |
|
|
/* return hit */ |
| 64 |
|
|
return(1); |
| 65 |
|
|
} |
