517 |
|
} |
518 |
|
|
519 |
|
|
520 |
+ |
int |
521 |
+ |
rayreject( /* check if candidate hit is worse than current */ |
522 |
+ |
OBJREC *o, |
523 |
+ |
RAY *r, |
524 |
+ |
double t |
525 |
+ |
) |
526 |
+ |
{ |
527 |
+ |
OBJREC *mnew, *mray; |
528 |
+ |
|
529 |
+ |
if ((t <= FTINY) | (t > r->rot + FTINY)) |
530 |
+ |
return 1; |
531 |
+ |
if (t < r->rot - FTINY) /* is new hit significantly closer? */ |
532 |
+ |
return 0; |
533 |
+ |
/* coincident, so decide... */ |
534 |
+ |
if (o == r->ro) |
535 |
+ |
return 1; /* shouldn't happen */ |
536 |
+ |
if (r->ro == NULL) |
537 |
+ |
return 0; /* ditto */ |
538 |
+ |
if ((mnew = findmaterial(o)) == NULL) |
539 |
+ |
return 1; /* new has no material */ |
540 |
+ |
if ((mray = findmaterial(r->ro)) == NULL) |
541 |
+ |
return 0; /* old has no material(!) */ |
542 |
+ |
if (istransp(mnew->otype)) |
543 |
+ |
return 1; /* new is transparent */ |
544 |
+ |
|
545 |
+ |
return !istransp(mray->otype); /* reject unless old is */ |
546 |
+ |
} |
547 |
+ |
|
548 |
|
void |
549 |
|
rayhit( /* standard ray hit test */ |
550 |
|
OBJECT *oset, |