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Hello everybody,<br><br>I have this piece of&nbsp; code:<br><br><br>&nbsp;&nbsp;&nbsp; this-&gt;_ren-&gt;AddActor(imgAct1);<br>&nbsp;&nbsp;&nbsp; this-&gt;_ren-&gt;AddActor(imgAct2);<br>&nbsp;&nbsp;&nbsp; this-&gt;_ren-&gt;AddActor(imgAct3);<br><br>&nbsp;&nbsp;&nbsp; _ren-&gt;Render();<br>&nbsp;&nbsp;&nbsp; _ren-&gt;ResetCamera();<br><br>where imgAct# are objects of vtkImageActor. Now,<br><br>Just after these statements, I call _ren-&gt;GetActors() to retrieve the actorCollection but it returns an empty collection.......why?<br><br>Kind regards.<br>Giancarlo<br><br /><hr />25 GB di spazio gratuito su Internet! <a href='http://clk.atdmt.com/GBL/go/140630366/direct/01/' target='_new'>Prova SkyDrive</a></body>
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