ingo wrote:
> 
> During writing mesh generation macros I often wished there woud be a try 
> except thingy. There are cases where POV-Ray just continues parsing 
> although the results are wrong, for example nomalising a zero length 
> vector.

But this is not the kind of situation a try .. except block should be 
used for.  You can easily solve this with a simple #if.

A try .. except would be useful for something like what Peter mentioned 
if you do not only want to check for the existence of a file but also 
want to handle the case the file exists but is not a valid png image.

Christoph

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