--- ray/src/px/pcond4.c	2004/03/28 20:33:14	3.17
+++ ray/src/px/pcond4.c	2004/11/14 16:57:18	3.19
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: pcond4.c,v 3.17 2004/03/28 20:33:14 schorsch Exp $";
+static const char	RCSid[] = "$Id: pcond4.c,v 3.19 2004/11/14 16:57:18 greg Exp $";
 #endif
 /*
  * Routines for veiling glare and loss of acuity.
@@ -298,7 +298,7 @@ typedef struct {
 
 SCANBAR	*rootbar;		/* root scan bar (lowest resolution) */
 
-float	*inpacuD;		/* input acuity data (cycles/degree) */
+float	*inpacuD = NULL;	/* input acuity data (cycles/degree) */
 
 #define tsampr(x,y)	inpacuD[(y)*fvxr+(x)]
 
@@ -364,6 +364,9 @@ acuscan(		/* get acuity-sampled scanline */
 	double	dx, dy;
 	int	ix, iy;
 	register int	x;
+	
+	if (inpacuD == NULL)
+		return;
 					/* compute foveal y position */
 	iy = dy = (y+.5)/numscans(&inpres)*fvyr - .5;
 	while (iy >= fvyr-1) iy--;
@@ -494,7 +497,7 @@ initacuity(void)			/* initialize variable acuity sampl
 	FVECT	diffx, diffy, cp;
 	double	omega, maxsr;
 	register int	x, y, i;
-
+	
 	compraydir();			/* compute ray directions */
 
 	inpacuD = (float *)malloc(fvxr*fvyr*sizeof(float));