--- ray/src/rt/text.c	1994/01/12 17:14:42	2.12
+++ ray/src/rt/text.c	1998/08/10 18:37:06	2.18
@@ -1,13 +1,11 @@
-/* Copyright (c) 1992 Regents of the University of California */
+/* Copyright (c) 1998 Silicon Graphics, Inc. */
 
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static char SCCSid[] = "$SunId$ SGI";
 #endif
 
 /*
  *  text.c - functions for text patterns and mixtures.
- *
- *     11/12/86
  */
 
 #include  "ray.h"
@@ -45,8 +43,10 @@ static char SCCSid[] = "$SunId$ LBL";
  *		[spacing]
  *
  *  Colortext is identical, except colors are given rather than
- *  brightnesses.  Mixtext has foreground and background modifiers:
+ *  brightnesses.
  *
+ *  Mixtext has foreground and background modifiers:
+ *
  *	modifier mixtext id
  *	4+ foremod backmod fontfile text..
  *	0
@@ -77,7 +77,7 @@ typedef struct {
 	TLINE  tl;			/* line list */
 }  TEXT;
 
-extern char  *libpath;
+extern char  *getlibpath();
 
 extern char  *fgetword();
 
@@ -86,7 +86,7 @@ TEXT  *gettext();
 TLINE  *tlalloc();
 
 
-text(m, r)
+do_text(m, r)
 register OBJREC  *m;
 RAY  *r;
 {
@@ -105,7 +105,7 @@ RAY  *r;
 		char  *modname = m->oargs.sarg[foreground ? 0 : 1];
 		if (!strcmp(modname, VOIDID))
 			omod = OVOID;
-		else if ((omod = modifier(modname)) == OVOID) {
+		else if ((omod = lastmod(objndx(m), modname)) == OVOID) {
 			sprintf(errmsg, "undefined modifier \"%s\"", modname);
 			objerror(m, USER, errmsg);
 		}
@@ -114,8 +114,7 @@ RAY  *r;
 				objerror(m, USER, "inappropriate modifier");
 			return(1);
 		}
-	}
-	if (m->otype == PAT_BTEXT) {
+	} else if (m->otype == PAT_BTEXT) {
 		if (foreground)
 			scalecolor(r->pcol, m->oargs.farg[9]);
 		else
@@ -180,7 +179,10 @@ register OBJREC  *tm;
 						/* compute vectors */
 	fcross(DxR, D, R);
 	fcross(t->right, DxR, D);
-	d = DOT(D,D)/DOT(t->right,t->right);
+	d = DOT(t->right,t->right);
+	if (d <= FTINY*FTINY)
+		objerror(tm, USER, "illegal motion vector");
+	d = DOT(D,D)/d;
 	for (i = 0; i < 3; i++)
 		t->right[i] *= d;
 	fcross(t->down, R, DxR);
@@ -201,7 +203,7 @@ register OBJREC  *tm;
 		tlp = tlp->next;
 	} else {				/* text file */
 		if ((s = getpath(tm->oargs.sarg[tndx(tm)],
-				libpath, R_OK)) == NULL) {
+				getlibpath(), R_OK)) == NULL) {
 			sprintf(errmsg, "cannot find text file \"%s\"",
 					tm->oargs.sarg[tndx(tm)]);
 			error(USER, errmsg);
@@ -225,7 +227,7 @@ register OBJREC  *tm;
 						/* compute character spacing */
 	i = sndx(tm);
 	d = i < tm->oargs.nfargs ? tm->oargs.farg[i] : 0.0;
-	i = d * 256.0;
+	i = d * 255.0;
 	t->tl.width = 0;
 	for (tlp = t->tl.next; tlp != NULL; tlp = tlp->next) {
 		if (i < 0)
@@ -281,15 +283,15 @@ OBJREC  *m;
 	x = DOT(v, tp->right);
 	i = sndx(m);
 	if (i < m->oargs.nfargs)
-		x *= tp->f->mwidth + 256.*fabs(m->oargs.farg[i]);
+		x *= tp->f->mwidth + 255.*fabs(m->oargs.farg[i]);
 	else
-		x *= 256.;
+		x *= 255.;
 	h = x;
 	i = y = DOT(v, tp->down);
 	if (x < 0.0 || y < 0.0)
 		return(0);
 	x -= (double)h;
-	y = ((i+1) - y)*256.;
+	y = ((i+1) - y)*255.;
 				/* find the line position */
 	for (tlp = tp->tl.next; tlp != NULL; tlp = tlp->next)
 		if (--i < 0)
@@ -297,7 +299,7 @@ OBJREC  *m;
 	if (tlp == NULL || h >= tlp->width)
 		return(0);
 	for (i = 0; (h -= tlp->spc[i]) >= 0; i++)
-		if (h < 256 && inglyph(h+x, y,
+		if (h < 255 && inglyph(h+x, y,
 				tp->f->fg[TLSTR(tlp)[i]&0xff]))
 			return(1);
 	return(0);
@@ -305,7 +307,7 @@ OBJREC  *m;
 
 
 inglyph(x, y, gl)		/* (x,y) within font glyph gl? */
-double  x, y;		/* real coordinates in range [0,256) */
+double  x, y;		/* real coordinates in range [0,255) */
 register GLYPH  *gl;
 {
 	int  n, ncross;