| 180 |
|
|
| 181 |
|
hdcell(cp, hp, gc) /* compute cell coordinates */ |
| 182 |
|
register FVECT cp[4]; /* returned (may be passed as FVECT cp[2][2]) */ |
| 183 |
< |
HOLO *hp; |
| 183 |
> |
register HOLO *hp; |
| 184 |
|
register GCOORD *gc; |
| 185 |
|
{ |
| 186 |
– |
register int i; |
| 186 |
|
register FLOAT *v; |
| 187 |
|
double d; |
| 188 |
< |
/* compute each corner */ |
| 189 |
< |
for (i = 0; i < 4; i++) { |
| 190 |
< |
VCOPY(cp[i], hp->orig); |
| 191 |
< |
if (gc->w & 1) { |
| 192 |
< |
v = hp->xv[gc->w>>1]; |
| 194 |
< |
cp[i][0] += *v++; cp[i][1] += *v++; cp[i][2] += *v; |
| 195 |
< |
} |
| 196 |
< |
d = (double)( gc->i[0] + (i&1) ) / hp->grid[wg0[gc->w]]; |
| 197 |
< |
v = hp->xv[wg0[gc->w]]; |
| 198 |
< |
cp[i][0] += d * *v++; cp[i][1] += d * *v++; cp[i][2] += d * *v; |
| 199 |
< |
|
| 200 |
< |
d = (double)( gc->i[1] + (i>>1) ) / hp->grid[wg1[gc->w]]; |
| 201 |
< |
v = hp->xv[wg1[gc->w]]; |
| 202 |
< |
cp[i][0] += d * *v++; cp[i][1] += d * *v++; cp[i][2] += d * *v; |
| 188 |
> |
/* compute common component */ |
| 189 |
> |
VCOPY(cp[0], hp->orig); |
| 190 |
> |
if (gc->w & 1) { |
| 191 |
> |
v = hp->xv[gc->w>>1]; |
| 192 |
> |
cp[0][0] += v[0]; cp[0][1] += v[1]; cp[0][2] += v[2]; |
| 193 |
|
} |
| 194 |
+ |
v = hp->xv[wg0[gc->w]]; |
| 195 |
+ |
d = (double)gc->i[0] / hp->grid[wg0[gc->w]]; |
| 196 |
+ |
VSUM(cp[0], cp[0], v, d); |
| 197 |
+ |
v = hp->xv[wg1[gc->w]]; |
| 198 |
+ |
d = (double)gc->i[1] / hp->grid[wg1[gc->w]]; |
| 199 |
+ |
VSUM(cp[0], cp[0], v, d); |
| 200 |
+ |
/* compute x1 sums */ |
| 201 |
+ |
v = hp->xv[wg0[gc->w]]; |
| 202 |
+ |
d = 1.0 / hp->grid[wg0[gc->w]]; |
| 203 |
+ |
VSUM(cp[1], cp[0], v, d); |
| 204 |
+ |
VSUM(cp[3], cp[0], v, d); |
| 205 |
+ |
/* compute y1 sums */ |
| 206 |
+ |
v = hp->xv[wg1[gc->w]]; |
| 207 |
+ |
d = 1.0 / hp->grid[wg1[gc->w]]; |
| 208 |
+ |
VSUM(cp[2], cp[0], v, d); |
| 209 |
+ |
VSUM(cp[3], cp[3], v, d); |
| 210 |
|
} |
| 211 |
|
|
| 212 |
|
|
| 251 |
|
double |
| 252 |
|
hdray(ro, rd, hp, gc, r) /* compute ray within a beam */ |
| 253 |
|
FVECT ro, rd; /* returned */ |
| 254 |
< |
register HOLO *hp; |
| 255 |
< |
register GCOORD gc[2]; |
| 254 |
> |
HOLO *hp; |
| 255 |
> |
GCOORD gc[2]; |
| 256 |
|
BYTE r[2][2]; |
| 257 |
|
{ |
| 258 |
< |
FVECT p[2]; |
| 259 |
< |
register int i; |
| 260 |
< |
register FLOAT *v; |
| 255 |
< |
double d; |
| 258 |
> |
FVECT cp[4], p[2]; |
| 259 |
> |
register int i, j; |
| 260 |
> |
double d0, d1; |
| 261 |
|
/* compute entry and exit points */ |
| 262 |
|
for (i = 0; i < 2; i++) { |
| 263 |
< |
VCOPY(p[i], hp->orig); |
| 264 |
< |
if (gc[i].w & 1) { |
| 265 |
< |
v = hp->xv[gc[i].w>>1]; |
| 266 |
< |
p[i][0] += *v++; p[i][1] += *v++; p[i][2] += *v; |
| 267 |
< |
} |
| 268 |
< |
d = ( gc[i].i[0] + (1./256.)*(r[i][0]+.5) ) / |
| 264 |
< |
hp->grid[wg0[gc[i].w]]; |
| 265 |
< |
v = hp->xv[wg0[gc[i].w]]; |
| 266 |
< |
p[i][0] += d * *v++; p[i][1] += d * *v++; p[i][2] += d * *v; |
| 267 |
< |
d = ( gc[i].i[1] + (1./256.)*(r[i][1]+.5) ) / |
| 268 |
< |
hp->grid[wg1[gc[i].w]]; |
| 269 |
< |
v = hp->xv[wg1[gc[i].w]]; |
| 270 |
< |
p[i][0] += d * *v++; p[i][1] += d * *v++; p[i][2] += d * *v; |
| 263 |
> |
hdcell(cp, hp, gc+i); |
| 264 |
> |
d0 = (1./256.)*(r[i][0]+.5); |
| 265 |
> |
d1 = (1./256.)*(r[i][1]+.5); |
| 266 |
> |
for (j = 0; j < 3; j++) |
| 267 |
> |
p[i][j] = (1.-d0-d1)*cp[0][j] + |
| 268 |
> |
d0*cp[1][j] + d1*cp[2][j]; |
| 269 |
|
} |
| 270 |
|
VCOPY(ro, p[0]); /* assign ray origin and direction */ |
| 271 |
|
rd[0] = p[1][0] - p[0][0]; |
