| 19 |
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#if SHADCACHE /* preemptive shadow checking */ |
| 20 |
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|
| 21 |
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|
| 22 |
< |
static void /* cast source ray to first blocker */ |
| 22 |
> |
static int /* cast source ray to first blocker */ |
| 23 |
|
castshadow(int sn, FVECT rorg, FVECT rdir) |
| 24 |
|
{ |
| 25 |
|
RAY rt; |
| 28 |
|
VCOPY(rt.rdir, rdir); |
| 29 |
|
rt.rmax = 0; |
| 30 |
|
rayorigin(&rt, NULL, PRIMARY, 1.0); |
| 31 |
< |
if (!localhit(&rt, &thescene)) |
| 32 |
< |
return; |
| 33 |
< |
/* pretend we were aimed at source */ |
| 34 |
< |
rt.crtype |= rt.rtype = SHADOW; |
| 35 |
< |
rt.rdir[0] = -rt.rdir[0]; |
| 36 |
< |
rt.rdir[1] = -rt.rdir[1]; |
| 37 |
< |
rt.rdir[2] = -rt.rdir[2]; |
| 38 |
< |
rt.rod = -rt.rod; |
| 39 |
< |
VSUB(rt.rorg, rt.rop, rt.rdir); |
| 40 |
< |
rt.rot = 1.; |
| 41 |
< |
rt.rsrc = sn; |
| 31 |
> |
/* check for intersection */ |
| 32 |
> |
while (localhit(&rt, &thescene)) { |
| 33 |
> |
RAY rt1 = rt; /* pretend we were aimed at source */ |
| 34 |
> |
rt1.crtype |= rt1.rtype = SHADOW; |
| 35 |
> |
rt1.rdir[0] = -rt.rdir[0]; |
| 36 |
> |
rt1.rdir[1] = -rt.rdir[1]; |
| 37 |
> |
rt1.rdir[2] = -rt.rdir[2]; |
| 38 |
> |
rt1.rod = -rt.rod; |
| 39 |
> |
VSUB(rt1.rorg, rt.rop, rt.rdir); |
| 40 |
> |
rt1.rot = 1.; |
| 41 |
> |
rt1.rsrc = sn; |
| 42 |
|
/* record blocker */ |
| 43 |
< |
srcblocker(&rt); |
| 43 |
> |
if (srcblocker(&rt1)) |
| 44 |
> |
return(1); |
| 45 |
> |
/* move past failed blocker */ |
| 46 |
> |
VSUM(rt.rorg, rt.rop, rt.rdir, FTINY); |
| 47 |
> |
rayclear(&rt); /* & try again... */ |
| 48 |
> |
} |
| 49 |
> |
return(0); /* found no blockers */ |
| 50 |
|
} |
| 51 |
|
|
| 52 |
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|
| 282 |
|
} |
| 283 |
|
|
| 284 |
|
|
| 285 |
< |
void /* record a source blocker */ |
| 285 |
> |
int /* record a source blocker */ |
| 286 |
|
srcblocker(register RAY *r) |
| 287 |
|
{ |
| 288 |
|
OBJREC *m; |
| 289 |
|
|
| 290 |
|
if (r->robj == OVOID || objptr(r->robj) != r->ro || |
| 291 |
|
isvolume(r->ro->otype)) |
| 292 |
< |
return; /* don't record complex blockers */ |
| 292 |
> |
return(0); /* don't record complex blockers */ |
| 293 |
|
m = findmaterial(r->ro); |
| 294 |
|
if (m == NULL) |
| 295 |
< |
return; /* no material?! */ |
| 295 |
> |
return(0); /* no material?! */ |
| 296 |
|
if (!isopaque(m->otype)) |
| 297 |
< |
return; /* material not a reliable blocker */ |
| 297 |
> |
return(0); /* material not a reliable blocker */ |
| 298 |
|
*srcobstructp(r) = r->robj; /* else record obstructor */ |
| 299 |
+ |
return(1); |
| 300 |
|
} |
| 301 |
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|
| 302 |
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|
