"Thorsten Froehlich"  wrote:
>BTW, do  you by any chance know how (if possible at all) to 
>implement a 'difference'?  the link you provided suggests it is 
>possible.  SO if it would be a really simple implementation I might 
>be able to add it as well...

This is really simple as Christoph pointed out.
See POV Help 3.4.4.5. 
(The operators in these documents should be also fixed.)

R. Suzuki.

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