3D texture mapping doesn't work on OS X
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
The OpenGL on Mac OS X doesn't provide the extension glTexImage3DEXT, but it does provide glTextImage3D as a native OpenGL version 1.4 function. As a result, vtkOpenGLVolumeTextureMapper3D does not detect the 3D texture mapping extension, even though 3D texture mapping is supported.
This has been fixed in CVS: http://public.kitware.com/cgi-bin/viewcvs.cgi/VolumeRendering/vtkOpenGLVolumeTextureMapper3D.cxx.diff?cvsroot=VTK&r1=1.7&r2=1.8
The fix could possibly go into vtkOpenGLExtensionManager instead of vtkOpenGLVolumeTextureMapper3D.