The source project of this merge request has been removed.
OGL2 : Restore GL blend state after changing it with the Fixed Point Volume Rendering (bug 15838)
This should fix the bug http://www.vtk.org/Bug/view.php?id=15838
The Fixed Point ray cast helper class was changing the blending parameters without restoring its state later on.
Hence, in that case, the function vtkTextureObject::Create2DFromRaw(...) was unable to blend correctly the transparent texture pixels, for example when using a vtkTextActor or a vtkTexturedButtonRepresentation2D