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#include "octree.h" |
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#include "otypes.h" |
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|
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#include "random.h" |
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#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
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extern char *amblist[]; /* ambient include/exclude list */ |
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extern int ambincl; /* include == 1, exclude == 0 */ |
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|
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OBJECT ambset[128]; /* ambient include/exclude set */ |
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#define MAXASET 511 /* maximum number of elements in ambient set */ |
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OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
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|
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double maxarad; /* maximum ambient radius */ |
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double minarad; /* minimum ambient radius */ |
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|
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/* |
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* Since we've defined our vectors as float below to save space, |
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* watch out for changes in the definitions of VCOPY() and DOT(). |
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*/ |
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typedef struct ambval { |
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FVECT pos; /* position in space */ |
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FVECT dir; /* normal direction */ |
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float pos[3]; /* position in space */ |
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float dir[3]; /* normal direction */ |
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int lvl; /* recursion level of parent ray */ |
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float weight; /* weight of parent ray */ |
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COLOR val; /* computed ambient value */ |
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char *afile; |
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{ |
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long ftell(); |
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char **amblp; |
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OBJECT obj; |
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AMBVAL amb; |
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/* set up ambient set */ |
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ambset[0] = 0; |
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for (amblp = amblist; *amblp != NULL; amblp++) { |
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if ((obj = modifier(*amblp)) == OVOID) { |
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sprintf(errmsg, "unknown %s modifier \"%s\"", |
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ambincl ? "include" : "exclude", *amblp); |
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error(WARNING, errmsg); |
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continue; |
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} |
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if (!inset(ambset, obj)) |
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insertelem(ambset, obj); |
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} |
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|
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maxarad = thescene.cusize / 2.0; /* maximum radius */ |
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/* minimum radius */ |
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minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
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/* open ambient file */ |
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if (afile != NULL) |
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if ((ambfp = fopen(afile, "r+")) != NULL) { |
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while (fread(&amb, sizeof(AMBVAL), 1, ambfp) == 1) |
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while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
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avinsert(&amb, &atrunk, thescene.cuorg, |
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thescene.cusize); |
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/* align */ |
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} |
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|
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|
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ambnotify(obj) /* record new modifier */ |
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OBJECT obj; |
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{ |
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static int hitlimit = 0; |
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register OBJREC *o = objptr(obj); |
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register char **amblp; |
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|
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if (hitlimit || !ismodifier(o->otype)) |
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return; |
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for (amblp = amblist; *amblp != NULL; amblp++) |
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if (!strcmp(o->oname, *amblp)) { |
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if (ambset[0] >= MAXASET) { |
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error(WARNING, "too many modifiers in ambient list"); |
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hitlimit++; |
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return; /* should this be fatal? */ |
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} |
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insertelem(ambset, obj); |
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return; |
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} |
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} |
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|
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|
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ambient(acol, r) /* compute ambient component for ray */ |
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COLOR acol; |
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register RAY *r; |
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for (j = 0; j < 3; j++) |
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d += (r->rop[j] - av->pos[j]) * |
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(av->dir[j] + r->ron[j]); |
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< |
if (d < -minarad) |
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> |
if (d*0.5 < -minarad*ambacc) |
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continue; |
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/* |
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* Jittering final test reduces image artifacts. |
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{ |
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extern int ambcmp(); |
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extern double sin(), cos(), sqrt(); |
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int hlist[4]; |
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double phi, xd, yd, zd; |
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double b, b2; |
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register AMBSAMP *div; |
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div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
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if (div == NULL) |
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error(SYSTEM, "out of memory in doambient"); |
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< |
} |
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> |
} else |
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> |
div = NULL; |
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/* make axes */ |
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uy[0] = uy[1] = uy[2] = 0.0; |
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for (k = 0; k < 3; k++) |
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fcross(ux, r->ron, uy); |
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normalize(ux); |
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fcross(uy, ux, r->ron); |
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/* set up urand */ |
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hlist[0] = r->rno; |
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/* sample divisions */ |
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arad = 0.0; |
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ne = 0; |
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< |
for (i = 0; i < nt; i++) |
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> |
for (i = 0; i < nt; i++) { |
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> |
hlist[1] = i; |
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for (j = 0; j < np; j++) { |
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rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
330 |
< |
zd = sqrt((i+frandom())/nt); |
331 |
< |
phi = 2.0*PI * (j+frandom())/np; |
330 |
> |
hlist[2] = j; |
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> |
hlist[3] = 0; |
332 |
> |
zd = sqrt((i+urand(ilhash(hlist,4)))/nt); |
333 |
> |
hlist[3] = 1; |
334 |
> |
phi = 2.0*PI * (j+urand(ilhash(hlist,4)))/np; |
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xd = cos(phi) * zd; |
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yd = sin(phi) * zd; |
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zd = sqrt(1.0 - zd*zd); |
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for (k = 0; k < 3; k++) |
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ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
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+ |
dimlist[ndims++] = i*np + j + 38813; |
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rayvalue(&ar); |
342 |
+ |
ndims--; |
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if (ar.rot < FHUGE) |
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arad += 1.0 / ar.rot; |
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< |
if (ns > 0) { /* save division */ |
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> |
if (div != NULL) { /* save division */ |
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div[ne].k = 0.0; |
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copycolor(div[ne].v, ar.rcol); |
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div[ne].n = 0; |
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} else |
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addcolor(acol, ar.rcol); |
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} |
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+ |
} |
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for (k = 0; k < ne; k++) { /* compute errors */ |
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if (div[k].n > 1) |
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div[k].k /= div[k].n; |
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/* super-sample */ |
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for (i = ns; i > 0; i--) { |
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rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
396 |
< |
zd = sqrt((div[0].t+frandom())/nt); |
397 |
< |
phi = 2.0*PI * (div[0].p+frandom())/np; |
396 |
> |
hlist[1] = div[0].t; |
397 |
> |
hlist[2] = div[0].p; |
398 |
> |
hlist[3] = 0; |
399 |
> |
zd = sqrt((div[0].t+urand(ilhash(hlist,4)+div[0].n))/nt); |
400 |
> |
hlist[3] = 1; |
401 |
> |
phi = 2.0*PI * (div[0].p+urand(ilhash(hlist,4)+div[0].n))/np; |
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xd = cos(phi) * zd; |
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yd = sin(phi) * zd; |
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zd = sqrt(1.0 - zd*zd); |
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for (k = 0; k < 3; k++) |
406 |
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ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
407 |
+ |
dimlist[ndims++] = div[0].t*np + div[0].p + 38813; |
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rayvalue(&ar); |
409 |
+ |
ndims--; |
410 |
+ |
rayvalue(&ar); |
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if (ar.rot < FHUGE) |
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arad += 1.0 / ar.rot; |
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/* recompute error */ |
420 |
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dnew.k = b2/(dnew.n*dnew.n); |
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/* reinsert */ |
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for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++) |
423 |
< |
bcopy(&div[k+1], &div[k], sizeof(AMBSAMP)); |
424 |
< |
bcopy(&dnew, &div[k], sizeof(AMBSAMP)); |
423 |
> |
copystruct(&div[k], &div[k+1]); |
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> |
copystruct(&div[k], &dnew); |
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|
426 |
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if (ne >= i) { /* extract darkest division */ |
427 |
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ne--; |
428 |
< |
if (div[ne].n > 1) |
429 |
< |
scalecolor(div[ne].v, 1.0/div[ne].n); |
428 |
> |
if (div[ne].n > 1) { |
429 |
> |
b = 1.0/div[ne].n; |
430 |
> |
scalecolor(div[ne].v, b); |
431 |
> |
div[ne].n = 1; |
432 |
> |
} |
433 |
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addcolor(acol, div[ne].v); |
434 |
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} |
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} |
442 |
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arad = maxarad; |
443 |
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else if (arad < minarad) |
444 |
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arad = minarad; |
445 |
< |
if (ns > 0) |
445 |
> |
if (div != NULL) |
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free((char *)div); |
447 |
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return(arad); |
448 |
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} |
469 |
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#endif |
470 |
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if (ambfp == NULL) |
471 |
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return; |
472 |
< |
if (fwrite(av, sizeof(AMBVAL), 1, ambfp) != 1) |
472 |
> |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
473 |
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goto writerr; |
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#ifdef AMBFLUSH |
475 |
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if (++nunflshed >= AMBFLUSH) { |
498 |
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|
499 |
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if ((av = newambval()) == NULL) |
500 |
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goto memerr; |
501 |
< |
bcopy(aval, av, sizeof(AMBVAL)); |
501 |
> |
copystruct(av, aval); |
502 |
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VCOPY(ck0, c0); |
503 |
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while (s*(OCTSCALE/2) > av->rad*ambacc) { |
504 |
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if (at->kid == NULL) |