--- ray/doc/ray.1 2007/06/01 19:46:07 1.12 +++ ray/doc/ray.1 2007/08/23 04:13:50 1.13 @@ -1235,8 +1235,7 @@ If no file is needed by a given primitive because all variables are global, a period (`.') can be given in place of the file name. It is also possible to give an expression instead of a straight -variable name in a scene file, although such expressions should -be kept simple if possible. +variable name in a scene file. Also, functions (requiring parameters) must be given as names and not as expressions. .PP