| 183 |
|
} |
| 184 |
|
|
| 185 |
|
|
| 186 |
+ |
sourcehit(r) /* check to see if ray hit distant source */ |
| 187 |
+ |
register RAY *r; |
| 188 |
+ |
{ |
| 189 |
+ |
int first, last; |
| 190 |
+ |
register int i; |
| 191 |
+ |
|
| 192 |
+ |
if (r->rsrc >= 0) { /* check only one if aimed */ |
| 193 |
+ |
first = last = r->rsrc; |
| 194 |
+ |
} else { /* otherwise check all */ |
| 195 |
+ |
first = 0; last = nsources-1; |
| 196 |
+ |
} |
| 197 |
+ |
for (i = first; i <= last; i++) |
| 198 |
+ |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
| 199 |
+ |
/* |
| 200 |
+ |
* Check to see if ray is within |
| 201 |
+ |
* solid angle of source. |
| 202 |
+ |
*/ |
| 203 |
+ |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
| 204 |
+ |
<= source[i].ss2) { |
| 205 |
+ |
r->ro = source[i].so; |
| 206 |
+ |
if (!(source[i].sflags & SSKIP)) |
| 207 |
+ |
break; |
| 208 |
+ |
} |
| 209 |
+ |
|
| 210 |
+ |
if (r->ro != NULL) { |
| 211 |
+ |
for (i = 0; i < 3; i++) |
| 212 |
+ |
r->ron[i] = -r->rdir[i]; |
| 213 |
+ |
r->rod = 1.0; |
| 214 |
+ |
r->rox = NULL; |
| 215 |
+ |
return(1); |
| 216 |
+ |
} |
| 217 |
+ |
return(0); |
| 218 |
+ |
} |
| 219 |
+ |
|
| 220 |
+ |
|
| 221 |
|
static int |
| 222 |
|
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
| 223 |
|
register CNTPTR *sc1, *sc2; |