| 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 */ |
| 263 |
|
/* diffuse reflection */ |
| 264 |
|
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
| 265 |
|
|
| 266 |
< |
if (r->ro != NULL && (r->ro->otype == OBJ_FACE || |
| 260 |
< |
r->ro->otype == OBJ_RING)) |
| 266 |
> |
if (r->ro != NULL && isflat(r->ro->otype)) |
| 267 |
|
nd.specfl |= SP_FLAT; |
| 268 |
|
|
| 269 |
|
getacoords(r, &nd); /* set up coordinates */ |
| 272 |
|
agaussamp(r, &nd); |
| 273 |
|
|
| 274 |
|
if (nd.rdiff > FTINY) { /* ambient from this side */ |
| 275 |
< |
ambient(ctmp, r); |
| 275 |
> |
ambient(ctmp, r, nd.pnorm); |
| 276 |
|
if (nd.specfl & SP_RBLT) |
| 277 |
|
scalecolor(ctmp, 1.0-nd.trans); |
| 278 |
|
else |
| 281 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 282 |
|
} |
| 283 |
|
if (nd.tdiff > FTINY) { /* ambient from other side */ |
| 284 |
+ |
FVECT bnorm; |
| 285 |
+ |
|
| 286 |
|
flipsurface(r); |
| 287 |
< |
ambient(ctmp, r); |
| 287 |
> |
bnorm[0] = -nd.pnorm[0]; |
| 288 |
> |
bnorm[1] = -nd.pnorm[1]; |
| 289 |
> |
bnorm[2] = -nd.pnorm[2]; |
| 290 |
> |
ambient(ctmp, r, bnorm); |
| 291 |
|
if (nd.specfl & SP_TBLT) |
| 292 |
|
scalecolor(ctmp, nd.trans); |
| 293 |
|
else |
