| 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 point, so decide... */ |
| 534 |
+ |
if (o == r->ro) |
| 535 |
+ |
return(1); /* shouldn't happen */ |
| 536 |
+ |
if (r->ro == NULL) |
| 537 |
+ |
return(0); /* ditto */ |
| 538 |
+ |
mnew = findmaterial(o); |
| 539 |
+ |
mray = findmaterial(r->ro); /* check material transparencies */ |
| 540 |
+ |
if (mnew == NULL) { |
| 541 |
+ |
if (mray != NULL) |
| 542 |
+ |
return(1); /* new has no material */ |
| 543 |
+ |
} else if (mray == NULL) { |
| 544 |
+ |
return(0); /* old has no material(!) */ |
| 545 |
+ |
} else if (istransp(mnew->otype)) { |
| 546 |
+ |
if (!istransp(mray->otype)) |
| 547 |
+ |
return(1); /* new is transparent */ |
| 548 |
+ |
} else if (istransp(mray->otype)) { |
| 549 |
+ |
return(0); /* old is transparent */ |
| 550 |
+ |
} |
| 551 |
+ |
/* weakest priority to later modifier definition */ |
| 552 |
+ |
return (r->ro->omod >= o->omod); |
| 553 |
+ |
} |
| 554 |
+ |
|
| 555 |
|
void |
| 556 |
|
rayhit( /* standard ray hit test */ |
| 557 |
|
OBJECT *oset, |
