| 19 |
|
extern double specthresh; /* specular sampling threshold */ |
| 20 |
|
extern double specjitter; /* specular sampling jitter */ |
| 21 |
|
|
| 22 |
+ |
extern int backvis; /* back faces visible? */ |
| 23 |
+ |
|
| 24 |
|
static agaussamp(), getacoords(); |
| 25 |
|
|
| 26 |
|
/* |
| 203 |
|
nd.v_alpha = m->oargs.farg[5]; |
| 204 |
|
if (nd.u_alpha < FTINY || nd.v_alpha <= FTINY) |
| 205 |
|
objerror(m, USER, "roughness too small"); |
| 206 |
< |
/* reorient if necessary */ |
| 207 |
< |
if (r->rod < 0.0) |
| 208 |
< |
flipsurface(r); |
| 206 |
> |
/* check for back side */ |
| 207 |
> |
if (r->rod < 0.0) { |
| 208 |
> |
if (!backvis && m->otype != MAT_TRANS2) { |
| 209 |
> |
raytrans(r); |
| 210 |
> |
return(1); |
| 211 |
> |
} |
| 212 |
> |
flipsurface(r); /* reorient if backvis */ |
| 213 |
> |
} |
| 214 |
|
/* get modifiers */ |
| 215 |
|
raytexture(r, m->omod); |
| 216 |
|
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
