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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal">There is a class called vtkRendererDelegate that I’m not sure anyone is using. Currently it does nothing in VTK or PV. You could subclass off of vtkRendererDelegate AND subclass off of vtkRenderer to make it do something I suppose. It seems like maybe an early version of render passes. Does anyone know of this being used?</p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal">Ken Martin PhD</p><p class="MsoNormal">Chairman & CFO</p><p class="MsoNormal">Kitware Inc.</p><p class="MsoNormal">28 Corporate Drive</p><p class="MsoNormal">Clifton Park NY 12065</p><p class="MsoNormal"><a href="mailto:ken.martin@kitware.com"><span style="color:blue">ken.martin@kitware.com</span></a></p><p class="MsoNormal">919 869-8871 (w)</p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal">This communication, including all attachments, contains confidential and legally privileged information, and it is intended only for the use of the addressee. Access to this email by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken in reliance on it is prohibited and may be unlawful. If you received this communication in error please notify us immediately and destroy the original message. Thank you.</p><p class="MsoNormal"> </p></div></body></html>