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/* Copyright (c) 1991 Regents of the University of California */ |
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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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/* |
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short nt, np; /* number of theta and phi directions */ |
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} AMBHEMI; /* ambient sample hemisphere */ |
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extern double sin(), cos(), sqrt(); |
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static int |
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ambcmp(d1, d2) /* decreasing order */ |
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AMBSAMP *d1, *d2; |
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multisamp(spt, 2, urand(ilhash(hlist,3)+dp->n)); |
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zd = sqrt((dp->t + spt[0])/h->nt); |
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phi = 2.0*PI * (dp->p + spt[1])/h->np; |
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xd = cos(phi) * zd; |
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yd = sin(phi) * zd; |
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xd = tcos(phi) * zd; |
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yd = tsin(phi) * zd; |
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zd = sqrt(1.0 - zd*zd); |
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for (i = 0; i < 3; i++) |
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ar.rdir[i] = xd*h->ux[i] + |
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rayvalue(&ar); |
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ndims--; |
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addcolor(dp->v, ar.rcol); |
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if (ar.rt > FTINY && ar.rt < FHUGE) |
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dp->r += 1.0/ar.rt; |
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/* be conservative and use rot */ |
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if (ar.rot > FTINY && ar.rot < FHUGE) |
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dp->r += 1.0/ar.rot; |
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/* (re)initialize error */ |
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if (dp->n++) { |
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b2 = bright(dp->v)/dp->n - bright(ar.rcol); |
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dp->n = 0; |
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if (divsample(dp, &hemi, r) < 0) |
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goto oopsy; |
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arad += dp->r; |
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if (div != NULL) |
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dp++; |
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else { |
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else |
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addcolor(acol, dp->v); |
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arad += dp->r; |
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} |
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} |
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if (ns > 0) { /* perform super-sampling */ |
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if (ns > 0 && arad > FTINY && ndivs/arad < minarad) |
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ns = 0; /* close enough */ |
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else if (ns > 0) { /* else perform super-sampling */ |
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comperrs(div, &hemi); /* compute errors */ |
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qsort(div, ndivs, sizeof(AMBSAMP), ambcmp); /* sort divs */ |
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/* super-sample */ |
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} |
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/* compute returned values */ |
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if (div != NULL) { |
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arad = 0.0; |
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for (i = ndivs, dp = div; i-- > 0; dp++) { |
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arad += dp->r; |
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if (dp->n > 1) { |
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scalecolor(acol, b); |
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if (arad <= FTINY) |
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arad = maxarad; |
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else { |
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else |
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arad = (ndivs+ns)/arad; |
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if (arad > maxarad) |
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arad = maxarad; |
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} |
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if (pg != NULL) { /* reduce radius if gradient large */ |
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d = DOT(pg,pg); |
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if (d*arad*arad > 1.0) |
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pg[i] *= d; |
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} |
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} |
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return(arad/sqrt(wt)); |
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if ((arad /= sqrt(wt)) > maxarad) |
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arad = maxarad; |
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return(arad); |
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oopsy: |
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if (div != NULL) |
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free((char *)div); |
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} |
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mag0 *= 2.0*PI / hp->np; |
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phi = 2.0*PI * (double)j/hp->np; |
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cosp = cos(phi); sinp = sin(phi); |
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cosp = tcos(phi); sinp = tsin(phi); |
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xd += mag0*cosp - mag1*sinp; |
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yd += mag0*sinp + mag1*cosp; |
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} |
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dp += hp->np; |
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} |
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phi = 2.0*PI * (j+.5)/hp->np + PI/2.0; |
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xd += mag * cos(phi); |
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yd += mag * sin(phi); |
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xd += mag * tcos(phi); |
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yd += mag * tsin(phi); |
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} |
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for (i = 0; i < 3; i++) |
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gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/(hp->nt*hp->np); |
