[vtkusers] Volume Rendering: PreRender6 Error

[Giancarlo Amati]

Good afternoon Users! I'm using the volume rendering (MIP) thing and for some reasons I get this message:

PreRender6 ERROR (x502) Invalid operation

which doesn't stop my software working but...it's an error!.

Anyway can enlight me!? 

Many thanks 
Giancarlo

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