That's a good question - fallback to the parallelogram-method might be a 
solution...

But I'm not sure if this is valid anyway, as the renderer will try to 
compute a surface normal on point 0 it would fail, wouldn't it? I have 
to look...

-sascha

ABX wrote:
> On Fri, 18 Jul 2003 08:00:47 +0200, sascha <sas### [at] userssourceforgenet>
> wrote:
> 
>>1.) Set up a plane 0-1-4
> 
> 
> What if 0-1-4 make single line ?
> 
> ABX

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