| 296 |
|
|
| 297 |
|
|
| 298 |
|
double |
| 299 |
< |
hdinter(gc, r, hp, ro, rd) /* compute ray intersection with section */ |
| 299 |
> |
hdinter(gc, r, ed, hp, ro, rd) /* compute ray intersection with section */ |
| 300 |
|
register GCOORD gc[2]; /* returned */ |
| 301 |
|
BYTE r[2][2]; /* returned */ |
| 302 |
+ |
double *ed; /* returned (optional) */ |
| 303 |
|
register HOLO *hp; |
| 304 |
|
FVECT ro, rd; /* rd should be normalized */ |
| 305 |
|
{ |
| 360 |
|
return(FHUGE); /* outside wall */ |
| 361 |
|
r[i][1] = 256. * (d - gc[i].i[1]); |
| 362 |
|
} |
| 363 |
< |
/* return distance from entry point */ |
| 364 |
< |
vt[0] = ro[0] - p[0][0]; |
| 365 |
< |
vt[1] = ro[1] - p[0][1]; |
| 366 |
< |
vt[2] = ro[2] - p[0][2]; |
| 366 |
< |
return(DOT(vt,rd)); |
| 363 |
> |
|
| 364 |
> |
if (ed != NULL) /* assign distance to exit point */ |
| 365 |
> |
*ed = t1; |
| 366 |
> |
return(t0); /* return distance to entry point */ |
| 367 |
|
} |
