109 |
|
RAY *r; |
110 |
|
{ |
111 |
|
extern int (*trace)(); |
112 |
– |
int gotmat; |
112 |
|
|
113 |
|
if (localhit(r, &thescene)) |
114 |
< |
gotmat = raycont(r); /* hit local surface, evaluate */ |
114 |
> |
raycont(r); /* hit local surface, evaluate */ |
115 |
|
else if (r->ro == &Aftplane) { |
116 |
|
r->ro = NULL; /* hit aft clipping plane */ |
117 |
|
r->rot = FHUGE; |
118 |
|
} else if (sourcehit(r)) |
119 |
< |
gotmat = rayshade(r, r->ro->omod); /* distant source */ |
119 |
> |
rayshade(r, r->ro->omod); /* distant source */ |
120 |
|
|
122 |
– |
if (r->ro != NULL && !gotmat) |
123 |
– |
objerror(r->ro, USER, "material not found"); |
124 |
– |
|
121 |
|
rayparticipate(r); /* for participating medium */ |
122 |
|
|
123 |
|
if (trace != NULL) |
129 |
|
register RAY *r; |
130 |
|
{ |
131 |
|
if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
132 |
< |
r->ro->omod == OVOID) { |
132 |
> |
!rayshade(r, r->ro->omod)) |
133 |
|
raytrans(r); |
138 |
– |
return(1); |
139 |
– |
} |
140 |
– |
return(rayshade(r, r->ro->omod)); |
134 |
|
} |
135 |
|
|
136 |
|
|
253 |
|
RAY fr, br; |
254 |
|
int foremat, backmat; |
255 |
|
register int i; |
256 |
< |
/* clip coefficient */ |
256 |
> |
/* bound coefficient */ |
257 |
|
if (coef > 1.0) |
258 |
|
coef = 1.0; |
259 |
|
else if (coef < 0.0) |
260 |
|
coef = 0.0; |
261 |
|
/* compute foreground and background */ |
262 |
< |
foremat = backmat = -1; |
262 |
> |
foremat = backmat = 0; |
263 |
|
/* foreground */ |
264 |
|
copystruct(&fr, r); |
265 |
< |
if (fore != OVOID && coef > FTINY) |
265 |
> |
if (coef > FTINY) |
266 |
|
foremat = rayshade(&fr, fore); |
267 |
|
/* background */ |
268 |
|
copystruct(&br, r); |
269 |
< |
if (back != OVOID && coef < 1.0-FTINY) |
269 |
> |
if (coef < 1.0-FTINY) |
270 |
|
backmat = rayshade(&br, back); |
271 |
< |
/* check */ |
272 |
< |
if (foremat < 0) |
273 |
< |
if (backmat < 0) |
274 |
< |
foremat = backmat = 0; |
271 |
> |
/* check for transparency */ |
272 |
> |
if (backmat ^ foremat) |
273 |
> |
if (backmat) |
274 |
> |
raytrans(&fr); |
275 |
|
else |
276 |
< |
foremat = backmat; |
284 |
< |
else if (backmat < 0) |
285 |
< |
backmat = foremat; |
286 |
< |
if ((foremat==0) != (backmat==0)) |
287 |
< |
objerror(r->ro, USER, "mixing material with non-material"); |
276 |
> |
raytrans(&br); |
277 |
|
/* mix perturbations */ |
278 |
|
for (i = 0; i < 3; i++) |
279 |
|
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
282 |
|
scalecolor(br.pcol, 1.0-coef); |
283 |
|
copycolor(r->pcol, fr.pcol); |
284 |
|
addcolor(r->pcol, br.pcol); |
296 |
– |
/* mix returned ray values */ |
297 |
– |
if (foremat) { |
298 |
– |
scalecolor(fr.rcol, coef); |
299 |
– |
scalecolor(br.rcol, 1.0-coef); |
300 |
– |
copycolor(r->rcol, fr.rcol); |
301 |
– |
addcolor(r->rcol, br.rcol); |
302 |
– |
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
303 |
– |
} |
285 |
|
/* return value tells if material */ |
286 |
< |
return(foremat); |
286 |
> |
if (!foremat & !backmat) |
287 |
> |
return(0); |
288 |
> |
/* mix returned ray values */ |
289 |
> |
scalecolor(fr.rcol, coef); |
290 |
> |
scalecolor(br.rcol, 1.0-coef); |
291 |
> |
copycolor(r->rcol, fr.rcol); |
292 |
> |
addcolor(r->rcol, br.rcol); |
293 |
> |
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
294 |
> |
return(1); |
295 |
|
} |
296 |
|
|
297 |
|
|