23 |
|
extern double specthresh; /* specular sampling threshold */ |
24 |
|
extern double specjitter; /* specular sampling jitter */ |
25 |
|
|
26 |
+ |
extern int backvis; /* back faces visible? */ |
27 |
+ |
|
28 |
|
static gaussamp(); |
29 |
|
|
30 |
|
/* |
160 |
|
register int i; |
161 |
|
/* easy shadow test */ |
162 |
|
if (r->crtype & SHADOW && m->otype != MAT_TRANS) |
163 |
< |
return; |
163 |
> |
return(1); |
164 |
|
|
165 |
|
if (m->oargs.nfargs != (m->otype == MAT_TRANS ? 7 : 5)) |
166 |
|
objerror(m, USER, "bad number of arguments"); |
175 |
|
nd.alpha2 = m->oargs.farg[4]; |
176 |
|
if ((nd.alpha2 *= nd.alpha2) <= FTINY) |
177 |
|
nd.specfl |= SP_PURE; |
178 |
< |
/* reorient if necessary */ |
179 |
< |
if (r->rod < 0.0) |
180 |
< |
flipsurface(r); |
178 |
> |
/* check for back side */ |
179 |
> |
if (r->rod < 0.0) { |
180 |
> |
if (!backvis && m->otype != MAT_TRANS) { |
181 |
> |
raytrans(r); |
182 |
> |
return(1); |
183 |
> |
} |
184 |
> |
flipsurface(r); /* reorient if backvis */ |
185 |
> |
} |
186 |
|
/* get modifiers */ |
187 |
|
raytexture(r, m->omod); |
188 |
|
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
262 |
|
transtest = 0; |
263 |
|
|
264 |
|
if (r->crtype & SHADOW) /* the rest is shadow */ |
265 |
< |
return; |
265 |
> |
return(1); |
266 |
|
/* diffuse reflection */ |
267 |
|
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
268 |
|
|
269 |
|
if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) |
270 |
< |
return; /* 100% pure specular */ |
270 |
> |
return(1); /* 100% pure specular */ |
271 |
|
|
272 |
|
if (r->ro != NULL && (r->ro->otype == OBJ_FACE || |
273 |
|
r->ro->otype == OBJ_RING)) |
301 |
|
/* check distance */ |
302 |
|
if (transtest > bright(r->rcol)) |
303 |
|
r->rt = transdist; |
304 |
+ |
|
305 |
+ |
return(1); |
306 |
|
} |
307 |
|
|
308 |
|
|