Some filter/renderPass disable GL_BLEND but never restore them
Namely :
-
vtkDepthOfFieldPass.cxx -
vtkEDLShading.cxx -
vtkPointFillPass.cxx -
vtkSobelGradientMagnitudePass.cxx -
vtkSSAAPass.cxx (!3003 (merged))
Hence if used with something like vtkTextActor or vtkBalloonRepresentation the blending is disabled and the rendering incorrect
Edited by Julien Finet