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]); |
169 |
|
|
170 |
|
hdcell(cp, hp, gc) /* compute cell coordinates */ |
171 |
|
register FVECT cp[4]; /* returned (may be passed as FVECT cp[2][2]) */ |
172 |
< |
HOLO *hp; |
172 |
> |
register HOLO *hp; |
173 |
|
register GCOORD *gc; |
174 |
|
{ |
186 |
– |
register int i; |
175 |
|
register FLOAT *v; |
176 |
|
double d; |
177 |
< |
/* compute each corner */ |
178 |
< |
for (i = 0; i < 4; i++) { |
179 |
< |
VCOPY(cp[i], hp->orig); |
180 |
< |
if (gc->w & 1) { |
181 |
< |
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; |
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 */ |
202 |
> |
hdlseg(lseg, hp, gc) /* compute line segment for beam */ |
203 |
|
register int lseg[2][3]; |
204 |
|
register HOLO *hp; |
205 |
< |
int i; |
205 |
> |
GCOORD gc[2]; |
206 |
|
{ |
212 |
– |
GCOORD gc[2]; |
207 |
|
register int k; |
208 |
|
|
215 |
– |
if (!hdbcoord(gc, hp, i)) /* compute grid coordinates */ |
216 |
– |
return(0); |
209 |
|
for (k = 0; k < 2; k++) { /* compute end points */ |
210 |
|
lseg[k][gc[k].w>>1] = gc[k].w&1 ? hp->grid[gc[k].w>>1]-1 : 0 ; |
211 |
|
lseg[k][wg0[gc[k].w]] = gc[k].i[0]; |
234 |
|
} |
235 |
|
|
236 |
|
|
237 |
+ |
hdgrid(gp, hp, wp) /* compute grid coordinates */ |
238 |
+ |
FVECT gp; /* returned */ |
239 |
+ |
register HOLO *hp; |
240 |
+ |
FVECT wp; |
241 |
+ |
{ |
242 |
+ |
FVECT vt; |
243 |
+ |
|
244 |
+ |
vt[0] = wp[0] - hp->orig[0]; |
245 |
+ |
vt[1] = wp[1] - hp->orig[1]; |
246 |
+ |
vt[2] = wp[2] - hp->orig[2]; |
247 |
+ |
gp[0] = DOT(vt, hp->wn[0]) * hp->wg[0]; |
248 |
+ |
gp[1] = DOT(vt, hp->wn[1]) * hp->wg[1]; |
249 |
+ |
gp[2] = DOT(vt, hp->wn[2]) * hp->wg[2]; |
250 |
+ |
} |
251 |
+ |
|
252 |
+ |
|
253 |
+ |
hdworld(wp, hp, gp) /* compute world coordinates */ |
254 |
+ |
register FVECT wp; |
255 |
+ |
register HOLO *hp; |
256 |
+ |
FVECT gp; |
257 |
+ |
{ |
258 |
+ |
register double d; |
259 |
+ |
|
260 |
+ |
d = gp[0]/hp->grid[0]; |
261 |
+ |
VSUM(wp, hp->orig, hp->xv[0], d); |
262 |
+ |
|
263 |
+ |
d = gp[1]/hp->grid[1]; |
264 |
+ |
VSUM(wp, wp, hp->xv[1], d); |
265 |
+ |
|
266 |
+ |
d = gp[2]/hp->grid[2]; |
267 |
+ |
VSUM(wp, wp, hp->xv[2], d); |
268 |
+ |
} |
269 |
+ |
|
270 |
+ |
|
271 |
|
double |
272 |
|
hdray(ro, rd, hp, gc, r) /* compute ray within a beam */ |
273 |
|
FVECT ro, rd; /* returned */ |
274 |
< |
register HOLO *hp; |
275 |
< |
register GCOORD gc[2]; |
274 |
> |
HOLO *hp; |
275 |
> |
GCOORD gc[2]; |
276 |
|
BYTE r[2][2]; |
277 |
|
{ |
278 |
< |
FVECT p[2]; |
279 |
< |
register int i; |
280 |
< |
register FLOAT *v; |
255 |
< |
double d; |
278 |
> |
FVECT cp[4], p[2]; |
279 |
> |
register int i, j; |
280 |
> |
double d0, d1; |
281 |
|
/* compute entry and exit points */ |
282 |
|
for (i = 0; i < 2; i++) { |
283 |
< |
VCOPY(p[i], hp->orig); |
284 |
< |
if (gc[i].w & 1) { |
285 |
< |
v = hp->xv[gc[i].w>>1]; |
286 |
< |
p[i][0] += *v++; p[i][1] += *v++; p[i][2] += *v; |
287 |
< |
} |
288 |
< |
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; |
283 |
> |
hdcell(cp, hp, gc+i); |
284 |
> |
d0 = (1./256.)*(r[i][0]+.5); |
285 |
> |
d1 = (1./256.)*(r[i][1]+.5); |
286 |
> |
for (j = 0; j < 3; j++) |
287 |
> |
p[i][j] = (1.-d0-d1)*cp[0][j] + |
288 |
> |
d0*cp[1][j] + d1*cp[2][j]; |
289 |
|
} |
290 |
|
VCOPY(ro, p[0]); /* assign ray origin and direction */ |
291 |
|
rd[0] = p[1][0] - p[0][0]; |
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 |
|
{ |
349 |
|
vt[0] = p[i][0] - hp->orig[0]; |
350 |
|
vt[1] = p[i][1] - hp->orig[1]; |
351 |
|
vt[2] = p[i][2] - hp->orig[2]; |
352 |
< |
if (gc[i].w & 1) { |
353 |
< |
v = hp->xv[gc[i].w>>1]; |
335 |
< |
vt[0] -= *v++; vt[1] -= *v++; vt[2] -= *v; |
336 |
< |
} |
337 |
< |
v = hp->gv[gc[i].w>>1][0]; |
338 |
< |
d = DOT(vt, v); |
352 |
> |
v = hp->wn[wg0[gc[i].w]]; |
353 |
> |
d = DOT(vt, v) * hp->wg[wg0[gc[i].w]]; |
354 |
|
if (d < 0. || (gc[i].i[0] = d) >= hp->grid[wg0[gc[i].w]]) |
355 |
|
return(FHUGE); /* outside wall */ |
356 |
|
r[i][0] = 256. * (d - gc[i].i[0]); |
357 |
< |
v = hp->gv[gc[i].w>>1][1]; |
358 |
< |
d = DOT(vt, v); |
357 |
> |
v = hp->wn[wg1[gc[i].w]]; |
358 |
> |
d = DOT(vt, v) * hp->wg[wg1[gc[i].w]]; |
359 |
|
if (d < 0. || (gc[i].i[1] = d) >= hp->grid[wg1[gc[i].w]]) |
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]; |
352 |
< |
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 |
|
} |