1 |
– |
/* Copyright (c) 1988 Regents of the University of California */ |
2 |
– |
|
1 |
|
#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
|
#endif |
6 |
– |
|
4 |
|
/* |
5 |
|
* o_instance.c - routines for computing ray intersections with octrees. |
9 |
– |
* |
10 |
– |
* 11/11/88 |
6 |
|
*/ |
7 |
|
|
8 |
+ |
#include "copyright.h" |
9 |
+ |
|
10 |
|
#include "ray.h" |
11 |
|
|
12 |
|
#include "instance.h" |
16 |
|
OBJREC *o; |
17 |
|
register RAY *r; |
18 |
|
{ |
22 |
– |
extern long nrays; |
19 |
|
RAY rcont; |
20 |
< |
register INSTANCE *in; |
20 |
> |
double d; |
21 |
> |
register INSTANCE *ins; |
22 |
|
register int i; |
23 |
|
/* get the octree */ |
24 |
< |
in = getinstance(o, GET_ALL); |
25 |
< |
/* copy old ray */ |
26 |
< |
bcopy(r, &rcont, sizeof(RAY)); |
27 |
< |
/* transform it */ |
28 |
< |
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); |
24 |
> |
ins = getinstance(o, IO_ALL); |
25 |
> |
/* copy and transform ray */ |
26 |
> |
copystruct(&rcont, r); |
27 |
> |
multp3(rcont.rorg, r->rorg, ins->x.b.xfm); |
28 |
> |
multv3(rcont.rdir, r->rdir, ins->x.b.xfm); |
29 |
|
for (i = 0; i < 3; i++) |
30 |
< |
rcont.rdir[i] /= in->b.sca; |
31 |
< |
/* trace it */ |
32 |
< |
if (!localhit(&rcont, &in->obj->scube)) |
33 |
< |
return(0); /* missed */ |
34 |
< |
if (rcont.rot * in->f.sca >= r->rot) |
35 |
< |
return(0); /* not close enough */ |
36 |
< |
/* if we have modifier, use it */ |
37 |
< |
if (o->omod != OVOID) |
30 |
> |
rcont.rdir[i] /= ins->x.b.sca; |
31 |
> |
rcont.rmax *= ins->x.b.sca; |
32 |
> |
/* clear and trace it */ |
33 |
> |
rayclear(&rcont); |
34 |
> |
if (!localhit(&rcont, &ins->obj->scube)) |
35 |
> |
return(0); /* missed */ |
36 |
> |
if (rcont.rot * ins->x.f.sca >= r->rot) |
37 |
> |
return(0); /* not close enough */ |
38 |
> |
|
39 |
> |
if (o->omod != OVOID) { /* if we have modifier, use it */ |
40 |
|
r->ro = o; |
41 |
< |
else { /* else use theirs */ |
41 |
> |
r->rox = NULL; |
42 |
> |
} else { /* else use theirs */ |
43 |
|
r->ro = rcont.ro; |
44 |
< |
multmat4(r->rofx, in->f.xfm, rcont.rofx); |
45 |
< |
r->rofs = in->f.sca * rcont.rofs; |
46 |
< |
multmat4(r->robx, in->b.xfm, rcont.robx); |
47 |
< |
r->robs = in->b.sca * rcont.robs; |
44 |
> |
if (rcont.rox != NULL) { |
45 |
> |
newrayxf(r); /* allocate transformation */ |
46 |
> |
/* NOTE: r->rox may equal rcont.rox! */ |
47 |
> |
multmat4(r->rox->f.xfm, rcont.rox->f.xfm, ins->x.f.xfm); |
48 |
> |
r->rox->f.sca = rcont.rox->f.sca * ins->x.f.sca; |
49 |
> |
multmat4(r->rox->b.xfm, ins->x.b.xfm, rcont.rox->b.xfm); |
50 |
> |
r->rox->b.sca = ins->x.b.sca * rcont.rox->b.sca; |
51 |
> |
} else |
52 |
> |
r->rox = &ins->x; |
53 |
|
} |
54 |
|
/* transform it back */ |
55 |
< |
r->rot = rcont.rot * in->f.sca; |
56 |
< |
multp3(r->rop, rcont.rop, in->f.xfm); |
57 |
< |
multv3(r->ron, rcont.ron, in->f.xfm); |
58 |
< |
for (i = 0; i < 3; i++) |
59 |
< |
r->ron[i] /= in->f.sca; |
55 |
> |
r->rot = rcont.rot * ins->x.f.sca; |
56 |
> |
multp3(r->rop, rcont.rop, ins->x.f.xfm); |
57 |
> |
multv3(r->ron, rcont.ron, ins->x.f.xfm); |
58 |
> |
multv3(r->pert, rcont.pert, ins->x.f.xfm); |
59 |
> |
d = 1./ins->x.f.sca; |
60 |
> |
for (i = 0; i < 3; i++) { |
61 |
> |
r->ron[i] *= d; |
62 |
> |
r->pert[i] *= d; |
63 |
> |
} |
64 |
|
r->rod = rcont.rod; |
65 |
+ |
r->uv[0] = rcont.uv[0]; |
66 |
+ |
r->uv[1] = rcont.uv[1]; |
67 |
|
/* return hit */ |
68 |
|
return(1); |
69 |
|
} |