OSPRay Volume Rendering not working with OpenGL-1 interface

Hello, we have compiled ParaView 5.3 with the "old" OpenGL-1 interface enabled. Now when I try to activate "ospray based" volume rendering, I get the message: "vtkSmartVolumeMapper (0xa615410): Invalid Render Mode"

I assume I already found the reason in the sourcecode: its a wrong enum statement in the file VTK/Rendering/VolumeOpenGL/vtkSmartVolumeMapper.h:

enum
{
DefaultRenderMode=0
RayCastAndTextureRenderMode,
RayCastRenderMode,
TextureRenderMode,
GPURenderMode,
OSPRayRenderMode,
UndefinedRenderMode,
InvalidRenderMode
};

OSPRayRenderMode is number 5, but it should be 6 (according to ParaViewCore/ServerManager/SMApplication/Resources/views_and_representations.xml)

Best regards,

Herwig Zilken
Jülich Supercomputing Centre
Research Center Juelich
52428 Juelich, Germany

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