| 16 |
|
|
| 17 |
|
#include "func.h" |
| 18 |
|
|
| 19 |
+ |
extern int backvis; /* back faces visible? */ |
| 20 |
+ |
|
| 21 |
|
/* |
| 22 |
|
* Arguments to this material include the color and specularity. |
| 23 |
|
* String arguments include the reflection function and files. |
| 351 |
|
/* compute reflectance */ |
| 352 |
|
dtmp = 1.0 - nd.trans - nd.rspec; |
| 353 |
|
setcolor(nd.rdiff, dtmp, dtmp, dtmp); |
| 354 |
< |
/* fix orientation */ |
| 355 |
< |
if (r->rod < 0.0) |
| 356 |
< |
flipsurface(r); |
| 354 |
> |
/* check for back side */ |
| 355 |
> |
if (r->rod < 0.0) { |
| 356 |
> |
if (!backvis && m->otype != MAT_TFUNC |
| 357 |
> |
&& m->otype != MAT_TDATA) { |
| 358 |
> |
raytrans(r); |
| 359 |
> |
return(1); |
| 360 |
> |
} |
| 361 |
> |
flipsurface(r); /* reorient if backvis */ |
| 362 |
> |
} |
| 363 |
|
/* get modifiers */ |
| 364 |
|
raytexture(r, m->omod); |
| 365 |
|
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
