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Hello Vtks :)<br><br>this is my question: I would like to make a rendering window where I have a kind of Mask (see mask.jpg in attachment) which simulates the view through a tube/cannula/pipe. In the white are there will be the standard rendering, but how can I superimpose that mask?<br><br>many thanks.<br>GC.<br>                                            <br /><hr />Chiacchiera con i tuoi amici via Webcam su Messenger. <a href='http://www.messenger.it/videoconversazioni.aspx' target='_new'>Videochiamali!</a></body>
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