41 |
|
static AMBTREE atrunk; /* our ambient trunk node */ |
42 |
|
|
43 |
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
44 |
+ |
static int ambheadlen; /* length of ambient file header */ |
45 |
|
|
46 |
+ |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
47 |
+ |
|
48 |
|
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
49 |
|
|
50 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
51 |
|
|
52 |
|
|
53 |
+ |
setambres(ar) /* set ambient resolution */ |
54 |
+ |
int ar; |
55 |
+ |
{ |
56 |
+ |
/* set min & max radii */ |
57 |
+ |
if (ar <= 0) { |
58 |
+ |
minarad = 0.0; |
59 |
+ |
maxarad = thescene.cusize / 2.0; |
60 |
+ |
} else { |
61 |
+ |
minarad = thescene.cusize / ar; |
62 |
+ |
maxarad = 16.0 * minarad; /* heuristic */ |
63 |
+ |
if (maxarad > thescene.cusize / 2.0) |
64 |
+ |
maxarad = thescene.cusize / 2.0; |
65 |
+ |
} |
66 |
+ |
if (maxarad <= FTINY) |
67 |
+ |
maxarad = .001; |
68 |
+ |
} |
69 |
+ |
|
70 |
+ |
|
71 |
|
setambient(afile) /* initialize calculation */ |
72 |
|
char *afile; |
73 |
|
{ |
74 |
< |
long ftell(); |
74 |
> |
extern long ftell(); |
75 |
|
AMBVAL amb; |
76 |
< |
|
77 |
< |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
78 |
< |
/* minimum radius */ |
58 |
< |
minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
59 |
< |
|
60 |
< |
/* open ambient file */ |
76 |
> |
/* init ambient limits */ |
77 |
> |
setambres(ambres); |
78 |
> |
/* open ambient file */ |
79 |
|
if (afile != NULL) |
80 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
81 |
< |
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
81 |
> |
initambfile(0); |
82 |
> |
while (readambval(&amb, ambfp)) |
83 |
|
avinsert(&amb, &atrunk, thescene.cuorg, |
84 |
|
thescene.cusize); |
85 |
|
/* align */ |
86 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); |
87 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
86 |
> |
fseek(ambfp, -((ftell(ambfp)-ambheadlen)%AMBVALSIZ), 1); |
87 |
> |
} else if ((ambfp = fopen(afile, "w")) != NULL) |
88 |
> |
initambfile(1); |
89 |
> |
else { |
90 |
|
sprintf(errmsg, "cannot open ambient file \"%s\"", |
91 |
|
afile); |
92 |
|
error(SYSTEM, errmsg); |
94 |
|
} |
95 |
|
|
96 |
|
|
97 |
+ |
initambfile(creat) /* initialize ambient file */ |
98 |
+ |
int creat; |
99 |
+ |
{ |
100 |
+ |
extern char *progname, *octname; |
101 |
+ |
|
102 |
+ |
setbuf(ambfp, bmalloc(BUFSIZ)); |
103 |
+ |
if (creat) { /* new file */ |
104 |
+ |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
105 |
+ |
progname, colval(ambval,RED), |
106 |
+ |
colval(ambval,GRN), colval(ambval,BLU), |
107 |
+ |
ambounce, ambacc); |
108 |
+ |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
109 |
+ |
ambdiv, ambssamp, ambres, |
110 |
+ |
octname==NULL ? "" : octname); |
111 |
+ |
fputformat(AMBFMT, ambfp); |
112 |
+ |
putc('\n', ambfp); |
113 |
+ |
putambmagic(ambfp); |
114 |
+ |
fflush(ambfp); |
115 |
+ |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
116 |
+ |
error(USER, "ambient file format error"); |
117 |
+ |
ambheadlen = ftell(ambfp); |
118 |
+ |
} |
119 |
+ |
|
120 |
+ |
|
121 |
|
ambnotify(obj) /* record new modifier */ |
122 |
|
OBJECT obj; |
123 |
|
{ |
145 |
|
register RAY *r; |
146 |
|
{ |
147 |
|
static int rdepth = 0; /* ambient recursion */ |
148 |
< |
double wsum; |
148 |
> |
double d; |
149 |
|
|
105 |
– |
rdepth++; /* increment level */ |
106 |
– |
|
150 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
151 |
|
goto dumbamb; |
152 |
|
/* check number of bounces */ |
153 |
< |
if (rdepth > ambounce) |
153 |
> |
if (rdepth >= ambounce) |
154 |
|
goto dumbamb; |
155 |
|
/* check ambient list */ |
156 |
|
if (ambincl != -1 && r->ro != NULL && |
158 |
|
goto dumbamb; |
159 |
|
|
160 |
|
if (ambacc <= FTINY) { /* no ambient storage */ |
161 |
< |
if (doambient(acol, r, NULL, NULL) == 0.0) |
161 |
> |
rdepth++; |
162 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
163 |
> |
rdepth--; |
164 |
> |
if (d == 0.0) |
165 |
|
goto dumbamb; |
166 |
< |
goto done; |
166 |
> |
return; |
167 |
|
} |
168 |
|
/* get ambient value */ |
169 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
170 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
171 |
< |
if (wsum > FTINY) |
172 |
< |
scalecolor(acol, 1.0/wsum); |
173 |
< |
else if (makeambient(acol, r) == 0.0) |
174 |
< |
goto dumbamb; |
175 |
< |
goto done; |
176 |
< |
|
170 |
> |
d = sumambient(acol, r, rdepth, |
171 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
172 |
> |
if (d > FTINY) |
173 |
> |
scalecolor(acol, 1.0/d); |
174 |
> |
else { |
175 |
> |
d = makeambient(acol, r, rdepth++); |
176 |
> |
rdepth--; |
177 |
> |
} |
178 |
> |
if (d > FTINY) |
179 |
> |
return; |
180 |
|
dumbamb: /* return global value */ |
181 |
|
copycolor(acol, ambval); |
133 |
– |
done: /* must finish here! */ |
134 |
– |
rdepth--; |
182 |
|
} |
183 |
|
|
184 |
|
|
185 |
|
double |
186 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
186 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
187 |
|
COLOR acol; |
188 |
|
register RAY *r; |
189 |
+ |
int al; |
190 |
|
AMBTREE *at; |
191 |
|
FVECT c0; |
192 |
|
double s; |
202 |
|
wsum = 0.0; |
203 |
|
for (av = at->alist; av != NULL; av = av->next) { |
204 |
|
/* |
205 |
< |
* Ray strength test. |
205 |
> |
* Ambient level test. |
206 |
|
*/ |
207 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
207 |
> |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
208 |
|
continue; |
209 |
|
/* |
210 |
|
* Ambient radius test. |
231 |
|
for (j = 0; j < 3; j++) |
232 |
|
d += (r->rop[j] - av->pos[j]) * |
233 |
|
(av->dir[j] + r->ron[j]); |
234 |
< |
if (d*0.5 < -minarad*ambacc) |
234 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
235 |
|
continue; |
236 |
|
/* |
237 |
|
* Jittering final test reduces image artifacts. |
238 |
|
*/ |
239 |
|
wt = sqrt(e1) + sqrt(e2); |
240 |
< |
wt *= .9 + .2*frandom(); |
240 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
241 |
|
if (wt > ambacc) |
242 |
|
continue; |
243 |
|
if (wt <= 1e-3) |
245 |
|
else |
246 |
|
wt = 1.0 / wt; |
247 |
|
wsum += wt; |
248 |
< |
copycolor(ct, av->val); |
248 |
> |
extambient(ct, av, r->rop, r->ron); |
249 |
|
scalecolor(ct, wt); |
250 |
|
addcolor(acol, ct); |
251 |
|
} |
264 |
|
break; |
265 |
|
} |
266 |
|
if (j == 3) |
267 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
267 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
268 |
|
} |
269 |
|
return(wsum); |
270 |
|
} |
271 |
|
|
272 |
|
|
273 |
|
double |
274 |
< |
makeambient(acol, r) /* make a new ambient value */ |
274 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
275 |
|
COLOR acol; |
276 |
|
register RAY *r; |
277 |
+ |
int al; |
278 |
|
{ |
279 |
|
AMBVAL amb; |
280 |
|
FVECT gp, gd; |
281 |
< |
|
282 |
< |
amb.rad = doambient(acol, r, gp, gd); /* compute ambient */ |
281 |
> |
/* compute weight */ |
282 |
> |
amb.weight = pow(AVGREFL, (double)al); |
283 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
284 |
> |
amb.weight = r->rweight; |
285 |
> |
/* compute ambient */ |
286 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
287 |
|
if (amb.rad == 0.0) |
288 |
|
return(0.0); |
289 |
|
/* store it */ |
290 |
|
VCOPY(amb.pos, r->rop); |
291 |
|
VCOPY(amb.dir, r->ron); |
292 |
< |
amb.lvl = r->rlvl; |
240 |
< |
amb.weight = r->rweight; |
292 |
> |
amb.lvl = al; |
293 |
|
copycolor(amb.val, acol); |
294 |
|
VCOPY(amb.gpos, gp); |
295 |
|
VCOPY(amb.gdir, gd); |
300 |
|
} |
301 |
|
|
302 |
|
|
303 |
+ |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
304 |
+ |
COLOR cr; |
305 |
+ |
register AMBVAL *ap; |
306 |
+ |
FVECT pv, nv; |
307 |
+ |
{ |
308 |
+ |
FVECT v1, v2; |
309 |
+ |
register int i; |
310 |
+ |
double d; |
311 |
+ |
|
312 |
+ |
d = 1.0; /* zeroeth order */ |
313 |
+ |
/* gradient due to translation */ |
314 |
+ |
for (i = 0; i < 3; i++) |
315 |
+ |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
316 |
+ |
/* gradient due to rotation */ |
317 |
+ |
VCOPY(v1, ap->dir); |
318 |
+ |
fcross(v2, v1, nv); |
319 |
+ |
d += DOT(ap->gdir, v2); |
320 |
+ |
if (d <= 0.0) { |
321 |
+ |
setcolor(cr, 0.0, 0.0, 0.0); |
322 |
+ |
return; |
323 |
+ |
} |
324 |
+ |
copycolor(cr, ap->val); |
325 |
+ |
scalecolor(cr, d); |
326 |
+ |
} |
327 |
+ |
|
328 |
+ |
|
329 |
|
static |
330 |
|
avsave(av) /* save an ambient value */ |
331 |
|
AMBVAL *av; |
332 |
|
{ |
255 |
– |
#ifdef AMBFLUSH |
333 |
|
static int nunflshed = 0; |
334 |
< |
#endif |
334 |
> |
|
335 |
|
if (ambfp == NULL) |
336 |
|
return; |
337 |
< |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
337 |
> |
if (writambval(av, ambfp) < 0) |
338 |
|
goto writerr; |
262 |
– |
#ifdef AMBFLUSH |
339 |
|
if (++nunflshed >= AMBFLUSH) { |
340 |
|
if (fflush(ambfp) == EOF) |
341 |
|
goto writerr; |
342 |
|
nunflshed = 0; |
343 |
|
} |
268 |
– |
#endif |
344 |
|
return; |
345 |
|
writerr: |
346 |
|
error(SYSTEM, "error writing ambient file"); |