--- ray/src/util/glaresrc.c	1991/03/20 12:18:14	1.7
+++ ray/src/util/glaresrc.c	1991/04/12 10:28:36	1.12
@@ -49,6 +49,11 @@ analyze()			/* analyze our scene */
 		memerr("view span brightness buffer");
 	for (v = vsize; v >= -vsize; v--) {
 		close_sources(v);
+#ifndef DEBUG
+		if (verbose)
+			fprintf(stderr, "%s: analyzing... %3ld%%\r",
+				progname, 100L*(vsize-v)/(2*vsize));
+#endif
 		getviewspan(v, spanbr);
 		left = hsize + 1;
 		for (h = -hsize; h <= hsize; h++) {
@@ -75,7 +80,6 @@ analyze()			/* analyze our scene */
 	}
 	free((char *)spanbr);
 	close_allsrcs();
-	absorb_specks();
 }
 
 
@@ -87,29 +91,29 @@ double	br;
 	register int	i;
 
 	if (h <= -hlim) {			/* left region */
-		d = (double)(h+hlim)/sampdens;
-		if (d <= -1.0+FTINY)
+		d = (double)(-h-hlim)/sampdens;
+		if (d >= 1.0-FTINY)
 			return;
 		tanb = d/sqrt(1.0-d*d);
 		for (i = 0; i < nglardirs; i++) {
 			d = indirect[i].lcos - tanb*indirect[i].lsin;
 			if (d > 0.0) {
 				indirect[i].sum += d * br;
-				indirect[i].n++;
+				indirect[i].n += d;
 			}
 		}
 		return;
 	}
 	if (h >= hlim) {			/* right region */
-		d = (double)(h-hlim)/sampdens;
-		if (d >= 1.0-FTINY)
+		d = (double)(-h+hlim)/sampdens;
+		if (d <= -1.0+FTINY)
 			return;
 		tanb = d/sqrt(1.0-d*d);
 		for (i = 0; i < nglardirs; i++) {
 			d = indirect[i].rcos - tanb*indirect[i].rsin;
 			if (d > 0.0) {
 				indirect[i].sum += d * br;
-				indirect[i].n++;
+				indirect[i].n += d;
 			}
 		}
 		return;
@@ -119,7 +123,7 @@ double	br;
 		d = cos(h_theta(h) - indirect[i].theta);
 		if (d > 0.0) {
 			indirect[i].sum += d * br;
-			indirect[i].n++;
+			indirect[i].n += d;
 		}
 	}
 }
@@ -127,6 +131,7 @@ double	br;
 
 comp_thresh()			/* compute glare threshold */
 {
+	SPANERR	sperr;
 	int	h, v;
 	int	nsamps;
 	double	brsum, br;
@@ -136,13 +141,15 @@ comp_thresh()			/* compute glare threshold */
 				progname);
 	brsum = 0.0;
 	nsamps = 0;
-	for (v = vsize; v >= -vsize; v -= TSAMPSTEP)
+	for (v = vsize; v >= -vsize; v -= TSAMPSTEP) {
+		setspanerr(&sperr, v);
 		for (h = -hsize; h <= hsize; h += TSAMPSTEP) {
-			if ((br = getviewpix(h, v)) < 0.0)
+			if ((br = getviewpix(h, v, &sperr)) < 0.0)
 				continue;
 			brsum += br;
 			nsamps++;
 		}
+	}
 	if (nsamps == 0) {
 		fprintf(stderr, "%s: no viewable scene!\n", progname);
 		exit(1);
@@ -153,7 +160,9 @@ comp_thresh()			/* compute glare threshold */
 		exit(1);
 	}
 	if (verbose) {
+#ifdef DEBUG
 		pict_stats();
+#endif
 		fprintf(stderr,
 			"%s: threshold set to %f cd/m2 from %d samples\n",
 				progname, threshold, nsamps);
@@ -281,10 +290,10 @@ register struct source	*sp;
 	for (ss = sp->first; ss != NULL; ss = ss->next) {
 		sp->brt += ss->brsum;
 		n += ss->r - ss->l;
-		if (compdir(dright, ss->r, ss->v) < 0)
-			compdir(dright, ss->r-2, ss->v);
+		if (compdir(dright, ss->r, ss->v, NULL) < 0)
+			compdir(dright, ss->r-2, ss->v, NULL);
 		for (h = ss->r-1; h >= ss->l; h--)
-			if (compdir(dthis, h, ss->v) == 0) {
+			if (compdir(dthis, h, ss->v, NULL) == 0) {
 				d = dist2(dthis, dright);
 				fvsum(sp->dir, sp->dir, dthis, d);
 				sp->dom += d;
@@ -299,7 +308,7 @@ register struct source	*sp;
 	donelist = sp;
 	if (verbose)
 		fprintf(stderr,
-	"%s: found source at (%.3f,%.3f,%.3f), dw %.5f, br %.1f (%d samps)\n",
+	"%s: source at [%.3f,%.3f,%.3f], dw %.5f, br %.1f (%d samps)\n",
 			progname, sp->dir[0], sp->dir[1], sp->dir[2], 
 			sp->dom, sp->brt, n);
 }
@@ -333,10 +342,10 @@ absorb_specks()			/* eliminate too-small sources */
 		fprintf(stderr, "%s: absorbing small sources...\n", progname);
 	head.next = donelist;
 	last = &head;
-	for (this = donelist; this != NULL; this = this->next)
+	for (this = head.next; this != NULL; this = this->next)
 		if (TOOSMALL(this)) {
 			last->next = this->next;
-			buddy = findbuddy(this, donelist);
+			buddy = findbuddy(this, head.next);
 			if (buddy != NULL)
 				mergesource(buddy, this);
 			else
@@ -352,15 +361,16 @@ absorb(s)			/* absorb a source into indirect */
 register struct source	*s;
 {
 	FVECT	dir;
-	register int	i, n;
+	double	d;
+	register int	i;
 
 	for (i = 0; i < nglardirs; i++) {
 		spinvector(dir, ourview.vdir, ourview.vup, indirect[i].theta);
-		n = DOT(dir,s->dir)*s->dom*(sampdens*sampdens) + 0.5;
-		if (n == 0)
+		d = DOT(dir,s->dir)*s->dom*(sampdens*sampdens);
+		if (d <= 0.0)
 			continue;
-		indirect[i].sum += n * s->brt;
-		indirect[i].n += n;
+		indirect[i].sum += d * s->brt;
+		indirect[i].n += d;
 	}
 	for ( ; s->first != NULL; s->first = s->first->next)
 		free((char *)s->first);