23 |
|
hdcompgrid(hp) /* compute derived grid vector and index */ |
24 |
|
register HOLO *hp; |
25 |
|
{ |
26 |
– |
FVECT AxB; |
26 |
|
double d; |
28 |
– |
register FLOAT *v; |
27 |
|
register int i, j; |
28 |
|
/* initialize depth map */ |
29 |
|
if (hd_depthmap[0] < 1.) { |
36 |
|
} |
37 |
|
/* compute grid coordinate vectors */ |
38 |
|
for (i = 0; i < 3; i++) { |
39 |
< |
fcross(AxB, hp->xv[(i+1)%3], v=hp->xv[(i+2)%3]); |
42 |
< |
VCOPY(hp->wn[i], AxB); |
39 |
> |
fcross(hp->wn[i], hp->xv[(i+1)%3], hp->xv[(i+2)%3]); |
40 |
|
if (normalize(hp->wn[i]) == 0.) |
41 |
|
error(USER, "degenerate holodeck section"); |
42 |
|
hp->wo[i<<1] = DOT(hp->wn[i],hp->orig); |
43 |
< |
hp->wo[i<<1|1] = hp->wo[i<<1] + DOT(hp->wn[i],hp->xv[i]); |
44 |
< |
fcross(hp->gv[i][0], v, AxB); |
45 |
< |
d = DOT(v,v) / DOT(hp->gv[i][0],hp->gv[i][0]) * |
49 |
< |
hp->grid[(i+1)%3]; |
50 |
< |
for (j = 0; j < 3; j++) |
51 |
< |
hp->gv[i][0][j] *= d; |
52 |
< |
fcross(hp->gv[i][1], AxB, v=hp->xv[(i+1)%3]); |
53 |
< |
d = DOT(v,v) / DOT(hp->gv[i][1],hp->gv[i][1]) * |
54 |
< |
hp->grid[(i+2)%3]; |
55 |
< |
for (j = 0; j < 3; j++) |
56 |
< |
hp->gv[i][1][j] *= d; |
43 |
> |
d = DOT(hp->wn[i],hp->xv[i]); |
44 |
> |
hp->wo[i<<1|1] = hp->wo[i<<1] + d; |
45 |
> |
hp->wg[i] = (double)hp->grid[i] / d; |
46 |
|
} |
47 |
|
/* compute linear depth range */ |
48 |
|
hp->tlin = VLEN(hp->xv[0]) + VLEN(hp->xv[1]) + VLEN(hp->xv[2]); |
167 |
|
} |
168 |
|
|
169 |
|
|
170 |
+ |
hdcell(cp, hp, gc) /* compute cell coordinates */ |
171 |
+ |
register FVECT cp[4]; /* returned (may be passed as FVECT cp[2][2]) */ |
172 |
+ |
register HOLO *hp; |
173 |
+ |
register GCOORD *gc; |
174 |
+ |
{ |
175 |
+ |
register FLOAT *v; |
176 |
+ |
double d; |
177 |
+ |
/* compute common component */ |
178 |
+ |
VCOPY(cp[0], hp->orig); |
179 |
+ |
if (gc->w & 1) { |
180 |
+ |
v = hp->xv[gc->w>>1]; |
181 |
+ |
cp[0][0] += v[0]; cp[0][1] += v[1]; cp[0][2] += v[2]; |
182 |
+ |
} |
183 |
+ |
v = hp->xv[wg0[gc->w]]; |
184 |
+ |
d = (double)gc->i[0] / hp->grid[wg0[gc->w]]; |
185 |
+ |
VSUM(cp[0], cp[0], v, d); |
186 |
+ |
v = hp->xv[wg1[gc->w]]; |
187 |
+ |
d = (double)gc->i[1] / hp->grid[wg1[gc->w]]; |
188 |
+ |
VSUM(cp[0], cp[0], v, d); |
189 |
+ |
/* compute x1 sums */ |
190 |
+ |
v = hp->xv[wg0[gc->w]]; |
191 |
+ |
d = 1.0 / hp->grid[wg0[gc->w]]; |
192 |
+ |
VSUM(cp[1], cp[0], v, d); |
193 |
+ |
VSUM(cp[3], cp[0], v, d); |
194 |
+ |
/* compute y1 sums */ |
195 |
+ |
v = hp->xv[wg1[gc->w]]; |
196 |
+ |
d = 1.0 / hp->grid[wg1[gc->w]]; |
197 |
+ |
VSUM(cp[2], cp[0], v, d); |
198 |
+ |
VSUM(cp[3], cp[3], v, d); |
199 |
+ |
} |
200 |
+ |
|
201 |
+ |
|
202 |
|
hdlseg(lseg, hp, i) /* compute line segment for beam */ |
203 |
|
register int lseg[2][3]; |
204 |
|
register HOLO *hp; |
237 |
|
} |
238 |
|
|
239 |
|
|
240 |
+ |
hdgrid(gp, hp, wp) /* compute grid coordinates */ |
241 |
+ |
FVECT gp; /* returned */ |
242 |
+ |
register HOLO *hp; |
243 |
+ |
FVECT wp; |
244 |
+ |
{ |
245 |
+ |
FVECT vt; |
246 |
+ |
|
247 |
+ |
vt[0] = wp[0] - hp->orig[0]; |
248 |
+ |
vt[1] = wp[1] - hp->orig[1]; |
249 |
+ |
vt[2] = wp[2] - hp->orig[2]; |
250 |
+ |
gp[0] = DOT(vt, hp->wn[0]) * hp->wg[0]; |
251 |
+ |
gp[1] = DOT(vt, hp->wn[1]) * hp->wg[1]; |
252 |
+ |
gp[2] = DOT(vt, hp->wn[2]) * hp->wg[2]; |
253 |
+ |
} |
254 |
+ |
|
255 |
+ |
|
256 |
+ |
hdworld(wp, hp, gp) /* compute world coordinates */ |
257 |
+ |
register FVECT wp; |
258 |
+ |
register HOLO *hp; |
259 |
+ |
FVECT gp; |
260 |
+ |
{ |
261 |
+ |
register double d; |
262 |
+ |
|
263 |
+ |
d = gp[0]/hp->grid[0]; |
264 |
+ |
VSUM(wp, hp->orig, hp->xv[0], d); |
265 |
+ |
|
266 |
+ |
d = gp[1]/hp->grid[1]; |
267 |
+ |
VSUM(wp, wp, hp->xv[1], d); |
268 |
+ |
|
269 |
+ |
d = gp[2]/hp->grid[2]; |
270 |
+ |
VSUM(wp, wp, hp->xv[2], d); |
271 |
+ |
} |
272 |
+ |
|
273 |
+ |
|
274 |
|
double |
275 |
|
hdray(ro, rd, hp, gc, r) /* compute ray within a beam */ |
276 |
|
FVECT ro, rd; /* returned */ |
277 |
< |
register HOLO *hp; |
278 |
< |
register GCOORD gc[2]; |
277 |
> |
HOLO *hp; |
278 |
> |
GCOORD gc[2]; |
279 |
|
BYTE r[2][2]; |
280 |
|
{ |
281 |
< |
FVECT p[2]; |
282 |
< |
register int i; |
283 |
< |
register FLOAT *v; |
229 |
< |
double d; |
281 |
> |
FVECT cp[4], p[2]; |
282 |
> |
register int i, j; |
283 |
> |
double d0, d1; |
284 |
|
/* compute entry and exit points */ |
285 |
|
for (i = 0; i < 2; i++) { |
286 |
< |
VCOPY(p[i], hp->orig); |
287 |
< |
if (gc[i].w & 1) { |
288 |
< |
v = hp->xv[gc[i].w>>1]; |
289 |
< |
p[i][0] += *v++; p[i][1] += *v++; p[i][2] += *v; |
290 |
< |
} |
291 |
< |
d = ( gc[i].i[0] + (1./256.)*(r[i][0]+.5) ) / |
238 |
< |
hp->grid[wg0[gc[i].w]]; |
239 |
< |
v = hp->xv[wg0[gc[i].w]]; |
240 |
< |
p[i][0] += d * *v++; p[i][1] += d * *v++; p[i][2] += d * *v; |
241 |
< |
d = (gc[i].i[1] + (1./256.)*(r[i][1]+.5)) / |
242 |
< |
hp->grid[wg1[gc[i].w]]; |
243 |
< |
v = hp->xv[wg1[gc[i].w]]; |
244 |
< |
p[i][0] += d * *v++; p[i][1] += d * *v++; p[i][2] += d * *v; |
286 |
> |
hdcell(cp, hp, gc+i); |
287 |
> |
d0 = (1./256.)*(r[i][0]+.5); |
288 |
> |
d1 = (1./256.)*(r[i][1]+.5); |
289 |
> |
for (j = 0; j < 3; j++) |
290 |
> |
p[i][j] = (1.-d0-d1)*cp[0][j] + |
291 |
> |
d0*cp[1][j] + d1*cp[2][j]; |
292 |
|
} |
293 |
|
VCOPY(ro, p[0]); /* assign ray origin and direction */ |
294 |
|
rd[0] = p[1][0] - p[0][0]; |
351 |
|
vt[0] = p[i][0] - hp->orig[0]; |
352 |
|
vt[1] = p[i][1] - hp->orig[1]; |
353 |
|
vt[2] = p[i][2] - hp->orig[2]; |
354 |
< |
if (gc[i].w & 1) { |
355 |
< |
v = hp->xv[gc[i].w>>1]; |
309 |
< |
vt[0] -= *v++; vt[1] -= *v++; vt[2] -= *v; |
310 |
< |
} |
311 |
< |
v = hp->gv[gc[i].w>>1][0]; |
312 |
< |
d = DOT(vt, v); |
354 |
> |
v = hp->wn[wg0[gc[i].w]]; |
355 |
> |
d = DOT(vt, v) * hp->wg[wg0[gc[i].w]]; |
356 |
|
if (d < 0. || (gc[i].i[0] = d) >= hp->grid[wg0[gc[i].w]]) |
357 |
|
return(FHUGE); /* outside wall */ |
358 |
|
r[i][0] = 256. * (d - gc[i].i[0]); |
359 |
< |
v = hp->gv[gc[i].w>>1][1]; |
360 |
< |
d = DOT(vt, v); |
359 |
> |
v = hp->wn[wg1[gc[i].w]]; |
360 |
> |
d = DOT(vt, v) * hp->wg[wg1[gc[i].w]]; |
361 |
|
if (d < 0. || (gc[i].i[1] = d) >= hp->grid[wg1[gc[i].w]]) |
362 |
|
return(FHUGE); /* outside wall */ |
363 |
|
r[i][1] = 256. * (d - gc[i].i[1]); |