--- ray/src/hd/rhd_odraw.c	1998/12/23 17:42:24	3.6
+++ ray/src/hd/rhd_odraw.c	1998/12/24 08:12:57	3.8
@@ -466,17 +466,12 @@ int	vn;
 			CLR4(odS.redraw, i);
 		}
 #else
-					/* redraw samples at each end */
+					/* redraw samples at beginning */
 	for (i = odView[vn].sfirst; i < odView[vn].sfirst+31; i++)
 		if (CHK4(odS.redraw, i)) {
 			odDrawSamp(vn, i);
 			CLR4(odS.redraw, i);
 		}
-	for (i = odView[vn].snext-31; i < odView[vn].snext; i++)
-		if (CHK4(odS.redraw, i)) {
-			odDrawSamp(vn, i);
-			CLR4(odS.redraw, i);
-		}
 					/* faster flag checks in middle */
 	for (j = odView[vn].snext>>5; j-- > (odView[vn].sfirst+0x1f)>>5; )
 		for (i = 0; odS.redraw[j]; i++)		/* skips faster */
@@ -484,6 +479,12 @@ int	vn;
 				odDrawSamp(vn, (j<<5)+i);
 				odS.redraw[j] &= ~(1L<<i);
 			}
+					/* redraw samples at end */
+	for (i = odView[vn].snext-31; i < odView[vn].snext; i++)
+		if (CHK4(odS.redraw, i)) {
+			odDrawSamp(vn, i);
+			CLR4(odS.redraw, i);
+		}
 #endif
 }
 
@@ -591,15 +592,15 @@ register struct ODview	*vp;
 	n = rise + run;
 	while (n--)			/* run out arm, checking depth */
 		if (run2 > rise2) {
-			if (depthchange(vp, x, y, x+xstep, y))
-				break;
 			x += xstep;
 			rise2 += rise;
-		} else {
-			if (depthchange(vp, x, y, x, y+ystep))
+			if (depthchange(vp, x-xstep, y, x, y))
 				break;
+		} else {
 			y += ystep;
 			run2 += run;
+			if (depthchange(vp, x, y-ystep, x, y))
+				break;
 		}
 	if (n < 0)			/* found something? */
 		return;
@@ -628,10 +629,12 @@ blockedge(vp, bi0, bi1)			/* check for edge between bl
 register struct ODview	*vp;
 register int	bi0, bi1;
 {
+	if (bi1 == bi0)
+		return(0);		/* same block */
 	if (bi1 < 0)
 		return(1);		/* end off view */
 	if (CHK4(vp->emap, bi1))
-		return(1);		/* end has edges */
+		return(1);		/* end block has edges */
 	if (bi1 == bi0+1 || bi1 == bi0-1 ||
 			bi1 == bi0+vp->hlow || bi1 == bi0-vp->hlow)
 		return(0);		/* end in adjacent block -- no edges */