| 626 |
|
int |
| 627 |
|
m_bsdf(OBJREC *m, RAY *r) |
| 628 |
|
{ |
| 629 |
< |
int hasthick = (m->otype == MAT_BSDF); |
| 630 |
< |
int hitfront; |
| 629 |
> |
const int hasthick = (m->otype == MAT_BSDF); |
| 630 |
> |
const int hitfront = (r->rod > 0); |
| 631 |
|
SCOLOR sctmp; |
| 632 |
|
SDError ec; |
| 633 |
|
FVECT upvec, vtmp; |
| 634 |
|
MFUNC *mf; |
| 635 |
|
BSDFDAT nd; |
| 636 |
+ |
/* check backface visibility */ |
| 637 |
+ |
if (!hitfront & !backvis) { |
| 638 |
+ |
raytrans(r); |
| 639 |
+ |
return(1); |
| 640 |
+ |
} |
| 641 |
|
/* check arguments */ |
| 642 |
|
if ((m->oargs.nsargs < hasthick+5) | (m->oargs.nfargs > 9) | |
| 643 |
|
(m->oargs.nfargs % 3)) |
| 644 |
|
objerror(m, USER, "bad # arguments"); |
| 640 |
– |
/* record surface struck */ |
| 641 |
– |
hitfront = (r->rod > 0); |
| 645 |
|
/* load cal file */ |
| 646 |
|
mf = hasthick ? getfunc(m, 5, 0x1d, 1) |
| 647 |
|
: getfunc(m, 4, 0xe, 1) ; |
| 651 |
|
nd.thick = evalue(mf->ep[0]); |
| 652 |
|
if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) |
| 653 |
|
nd.thick = 0; |
| 651 |
– |
} |
| 652 |
– |
/* check backface visibility */ |
| 653 |
– |
if (!hitfront & !backvis) { |
| 654 |
– |
raytrans(r); |
| 655 |
– |
return(1); |
| 654 |
|
} |
| 655 |
|
/* check other rays to pass */ |
| 656 |
|
if (nd.thick != 0 && (r->crtype & SHADOW || |
