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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal">I am very new to using vtk. I am interested in getting access to the underlying OpenGL texture index from vtkOpenGLTexture. Currently, when I initially create and load a texture, the call to GetIndex() always returns zero. After rendering a frame or more, the GetIndex() appears to become valid and then I can make my OpenGL calls using it. Is there an event that indicates when this index becomes valid, or is there some other way to know exactly when glGenTextures occurs so I can make my modifications?</p></div></body></html>