--- ray/src/rt/func.c	1993/08/03 12:04:58	2.10
+++ ray/src/rt/func.c	1993/09/29 10:39:40	2.11
@@ -69,6 +69,7 @@ int  dofwd;
 		funset("erf", 1, ':', l_erf);
 		funset("erfc", 1, ':', l_erfc);
 		setnoisefuncs();
+		setprismfuncs();
 		loadfunc(initfile);
 		initfile[0] = '\0';
 	}