| 84 |
|
* The ray directions that define the pyramid in visit_cells() needn't |
| 85 |
|
* be normalized, but they must be given in clockwise order as seen |
| 86 |
|
* from the pyramid's apex (origin). |
| 87 |
+ |
* If no cell centers fall within the domain, the closest cell is visited. |
| 88 |
|
*/ |
| 89 |
|
int |
| 90 |
|
visit_cells(orig, pyrd, hp, vf, dp) /* visit cells within a pyramid */ |
| 91 |
|
FVECT orig, pyrd[4]; /* pyramid ray directions in clockwise order */ |
| 92 |
< |
HOLO *hp; |
| 92 |
> |
register HOLO *hp; |
| 93 |
|
int (*vf)(); |
| 94 |
|
char *dp; |
| 95 |
|
{ |
| 96 |
< |
int n = 0; |
| 96 |
> |
int ncalls = 0, n = 0; |
| 97 |
|
int inflags = 0; |
| 98 |
|
FVECT gp, pn[4], lo, ld; |
| 99 |
|
double po[4], lbeg, lend, d, t; |
| 100 |
< |
GCOORD gc; |
| 100 |
> |
GCOORD gc, gc2[2]; |
| 101 |
|
register int i; |
| 102 |
|
/* figure out whose side we're on */ |
| 103 |
|
hdgrid(gp, hp, orig); |
| 143 |
|
if (lbeg >= lend) |
| 144 |
|
continue; |
| 145 |
|
i = lend + .5; /* visit cells on this scan */ |
| 146 |
< |
for (gc.i[0] = lbeg + .5; gc.i[0] < i; gc.i[0]++) |
| 146 |
> |
for (gc.i[0] = lbeg + .5; gc.i[0] < i; gc.i[0]++) { |
| 147 |
|
n += (*vf)(&gc, dp); |
| 148 |
+ |
ncalls++; |
| 149 |
+ |
} |
| 150 |
|
} |
| 151 |
|
} |
| 152 |
< |
return(n); |
| 152 |
> |
if (ncalls) /* got one at least */ |
| 153 |
> |
return(n); |
| 154 |
> |
/* else find closest cell */ |
| 155 |
> |
VSUM(ld, pyrd[0], pyrd[1], 1.); |
| 156 |
> |
VSUM(ld, ld, pyrd[2], 1.); |
| 157 |
> |
VSUM(ld, ld, pyrd[3], 1.); |
| 158 |
> |
#if 0 |
| 159 |
> |
if (normalize(ld) == 0.0) /* technically not necessary */ |
| 160 |
> |
return(0); |
| 161 |
> |
#endif |
| 162 |
> |
d = hdinter(gc2, NULL, &t, hp, orig, ld); |
| 163 |
> |
if (d >= FHUGE || t <= 0.) |
| 164 |
> |
return(0); |
| 165 |
> |
return((*vf)(gc2+1, dp)); /* visit it */ |
| 166 |
|
} |
| 167 |
|
|
| 168 |
|
|
| 294 |
|
{ |
| 295 |
|
register int hd, w, i; |
| 296 |
|
int g0, g1; |
| 297 |
< |
FVECT wp[2]; |
| 297 |
> |
FVECT wp[2], mov; |
| 298 |
|
double d; |
| 299 |
|
/* do each wall on each section */ |
| 300 |
|
for (hd = 0; hdlist[hd] != NULL; hd++) |
| 301 |
|
for (w = 0; w < 6; w++) { |
| 302 |
|
g0 = ((w>>1)+1)%3; |
| 303 |
|
g1 = ((w>>1)+2)%3; |
| 304 |
< |
for (i = hdlist[hd]->grid[g0]; i--; ) { /* g0 lines */ |
| 305 |
< |
d = (double)i/hdlist[hd]->grid[g0]; |
| 304 |
> |
d = 1.0/hdlist[hd]->grid[g0]; |
| 305 |
> |
mov[0] = d * hdlist[hd]->xv[g0][0]; |
| 306 |
> |
mov[1] = d * hdlist[hd]->xv[g0][1]; |
| 307 |
> |
mov[2] = d * hdlist[hd]->xv[g0][2]; |
| 308 |
> |
if (w & 1) { |
| 309 |
|
VSUM(wp[0], hdlist[hd]->orig, |
| 291 |
– |
hdlist[hd]->xv[g0], d); |
| 292 |
– |
if (w & 1) |
| 293 |
– |
VSUM(wp[0], wp[0], |
| 310 |
|
hdlist[hd]->xv[w>>1], 1.); |
| 311 |
< |
VSUM(wp[1], wp[0], hdlist[hd]->xv[g1], 1.); |
| 311 |
> |
VSUM(wp[0], wp[0], mov, 1.); |
| 312 |
> |
} else |
| 313 |
> |
VCOPY(wp[0], hdlist[hd]->orig); |
| 314 |
> |
VSUM(wp[1], wp[0], hdlist[hd]->xv[g1], 1.); |
| 315 |
> |
for (i = hdlist[hd]->grid[g0]; ; ) { /* g0 lines */ |
| 316 |
|
(*f)(wp); |
| 317 |
+ |
if (!--i) break; |
| 318 |
+ |
wp[0][0] += mov[0]; wp[0][1] += mov[1]; |
| 319 |
+ |
wp[0][2] += mov[2]; wp[1][0] += mov[0]; |
| 320 |
+ |
wp[1][1] += mov[1]; wp[1][2] += mov[2]; |
| 321 |
|
} |
| 322 |
< |
for (i = hdlist[hd]->grid[g1]; i--; ) { /* g1 lines */ |
| 323 |
< |
d = (double)i/hdlist[hd]->grid[g1]; |
| 322 |
> |
d = 1.0/hdlist[hd]->grid[g1]; |
| 323 |
> |
mov[0] = d * hdlist[hd]->xv[g1][0]; |
| 324 |
> |
mov[1] = d * hdlist[hd]->xv[g1][1]; |
| 325 |
> |
mov[2] = d * hdlist[hd]->xv[g1][2]; |
| 326 |
> |
if (w & 1) |
| 327 |
|
VSUM(wp[0], hdlist[hd]->orig, |
| 301 |
– |
hdlist[hd]->xv[g1], d); |
| 302 |
– |
if (w & 1) |
| 303 |
– |
VSUM(wp[0], wp[0], |
| 328 |
|
hdlist[hd]->xv[w>>1], 1.); |
| 329 |
< |
VSUM(wp[1], wp[0], hdlist[hd]->xv[g0], 1.); |
| 329 |
> |
else |
| 330 |
> |
VSUM(wp[0], hdlist[hd]->orig, mov, 1.); |
| 331 |
> |
VSUM(wp[1], wp[0], hdlist[hd]->xv[g0], 1.); |
| 332 |
> |
for (i = hdlist[hd]->grid[g1]; ; ) { /* g1 lines */ |
| 333 |
|
(*f)(wp); |
| 334 |
+ |
if (!--i) break; |
| 335 |
+ |
wp[0][0] += mov[0]; wp[0][1] += mov[1]; |
| 336 |
+ |
wp[0][2] += mov[2]; wp[1][0] += mov[0]; |
| 337 |
+ |
wp[1][1] += mov[1]; wp[1][2] += mov[2]; |
| 338 |
|
} |
| 339 |
|
} |
| 340 |
|
} |
