--- ray/src/ot/sphere.c	2003/02/22 02:07:26	2.2
+++ ray/src/ot/sphere.c	2016/04/20 18:51:35	2.6
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: sphere.c,v 2.2 2003/02/22 02:07:26 greg Exp $";
+static const char	RCSid[] = "$Id: sphere.c,v 2.6 2016/04/20 18:51:35 greg Exp $";
 #endif
 /*
  *  sphere.c - routines for creating octrees for spheres.
@@ -50,14 +50,16 @@ static const char	RCSid[] = "$Id: sphere.c,v 2.2 2003/
  */
 
 
-o_sphere(o, cu)			/* determine if sphere intersects cube */
-OBJREC  *o;
-register CUBE  *cu;
+int
+o_sphere(			/* determine if sphere intersects cube */
+	OBJREC  *o,
+	CUBE  *cu
+)
 {
 	FVECT  v1;
 	double  d1, d2;
-	register FLOAT  *fa;
-	register int  i;
+	RREAL  *fa;
+	int  i;
 #define  cent		fa
 #define  rad		fa[3]
 					/* get arguments */
@@ -69,8 +71,10 @@ register CUBE  *cu;
 		o->otype = o->otype == OBJ_SPHERE ?
 				OBJ_BUBBLE : OBJ_SPHERE;
 		rad = -rad;
-	} else if (rad <= FTINY)
-		objerror(o, USER, "zero radius");
+	} else if (rad <= FTINY) {
+		objerror(o, WARNING, "zero radius");
+		return(O_MISS);
+	}
 
 	d1 = ROOT3/2.0 * cu->cusize;	/* bounding radius for cube */