| 200 |
|
double coef; |
| 201 |
|
{ |
| 202 |
|
RAY fr, br; |
| 203 |
– |
COLOR ctmp; |
| 203 |
|
int foremat, backmat; |
| 204 |
|
register int i; |
| 205 |
|
/* clip coefficient */ |
| 207 |
|
coef = 1.0; |
| 208 |
|
else if (coef < 0.0) |
| 209 |
|
coef = 0.0; |
| 210 |
+ |
/* compute foreground and background */ |
| 211 |
+ |
foremat = backmat = -1; |
| 212 |
|
/* foreground */ |
| 213 |
|
copystruct(&fr, r); |
| 213 |
– |
fr.pert[0] = fr.pert[1] = fr.pert[2] = 0.0; |
| 214 |
– |
setcolor(fr.pcol, 1.0, 1.0, 1.0); |
| 215 |
– |
setcolor(fr.rcol, 0.0, 0.0, 0.0); |
| 214 |
|
if (fore != OVOID && coef > FTINY) |
| 215 |
|
foremat = rayshade(&fr, fore); |
| 218 |
– |
else |
| 219 |
– |
foremat = 0; |
| 216 |
|
/* background */ |
| 217 |
|
copystruct(&br, r); |
| 222 |
– |
br.pert[0] = br.pert[1] = br.pert[2] = 0.0; |
| 223 |
– |
setcolor(br.pcol, 1.0, 1.0, 1.0); |
| 224 |
– |
setcolor(br.rcol, 0.0, 0.0, 0.0); |
| 218 |
|
if (back != OVOID && coef < 1.0-FTINY) |
| 219 |
|
backmat = rayshade(&br, back); |
| 227 |
– |
else |
| 228 |
– |
backmat = foremat; |
| 220 |
|
/* check */ |
| 221 |
< |
if ((backmat==0) != (foremat==0)) |
| 221 |
> |
if (foremat < 0) |
| 222 |
> |
if (backmat < 0) |
| 223 |
> |
foremat = backmat = 0; |
| 224 |
> |
else |
| 225 |
> |
foremat = backmat; |
| 226 |
> |
else if (backmat < 0) |
| 227 |
> |
backmat = foremat; |
| 228 |
> |
if ((foremat==0) != (backmat==0)) |
| 229 |
|
objerror(r->ro, USER, "mixing material with non-material"); |
| 230 |
< |
/* sum perturbations */ |
| 230 |
> |
/* mix perturbations */ |
| 231 |
|
for (i = 0; i < 3; i++) |
| 232 |
< |
r->pert[i] += coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
| 233 |
< |
/* multiply pattern colors */ |
| 232 |
> |
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
| 233 |
> |
/* mix pattern colors */ |
| 234 |
|
scalecolor(fr.pcol, coef); |
| 235 |
|
scalecolor(br.pcol, 1.0-coef); |
| 236 |
< |
copycolor(ctmp, fr.pcol); |
| 237 |
< |
addcolor(ctmp, br.pcol); |
| 238 |
< |
multcolor(r->pcol, ctmp); |
| 239 |
< |
/* sum returned ray values */ |
| 240 |
< |
scalecolor(fr.rcol, coef); |
| 241 |
< |
scalecolor(br.rcol, 1.0-coef); |
| 242 |
< |
addcolor(r->rcol, fr.rcol); |
| 243 |
< |
addcolor(r->rcol, br.rcol); |
| 246 |
< |
if (foremat) |
| 236 |
> |
copycolor(r->pcol, fr.pcol); |
| 237 |
> |
addcolor(r->pcol, br.pcol); |
| 238 |
> |
/* mix returned ray values */ |
| 239 |
> |
if (foremat) { |
| 240 |
> |
scalecolor(fr.rcol, coef); |
| 241 |
> |
scalecolor(br.rcol, 1.0-coef); |
| 242 |
> |
copycolor(r->rcol, fr.rcol); |
| 243 |
> |
addcolor(r->rcol, br.rcol); |
| 244 |
|
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
| 245 |
+ |
} |
| 246 |
|
/* return value tells if material */ |
| 247 |
|
return(foremat); |
| 248 |
|
} |
