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</o:shapelayout></xml><![endif]--></head><body lang=ES link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>In VTK I have derived the vtkAxesActor class in order to fix the trihedron in a fixed place on the screen. For this I have override the RenderOpaqueGeometry() method that is called for each actor when a renderer->render() is invoked and I modify the position of the Axes to display it in the desired position.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>I’m aware of the limitations of this class in VES as it has been discussed in a previous thread but I would like to know if there is a similar way to modify the position of one actor before rendering it with the camera parameters already established. My problem is that I do not fully understand the workflow generated after a renderer->render() call. I have checked the VES code and there are some other classes involved as vesVisitor that I do not understand.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>In VTK I also display an image background using a second camera not related with the interactor but as I understand it is not possible to use a second camera in VES. I’m thinking in using the first approach and modify the image position before rendering it. Does it make sense?<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>Regards,<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>Carlos<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p></div></body></html>