The program I am talking about exactly is POVRayRender.
After I copied the folder from basedir .WolframEngine to /Applications it was fine. Then I had figured out how to set the config-path exactly
ConfigurePOVRayRender["POVRayPath" -> "/usr/local/bin/povray"]
now this seems to work as it should.
I could still need some information how to install MathGl3D now...does it work on the Raspberry Pi at all? I tried to extract the linked mgl2_2linux.exe.tar.gz and copied the MathGl3d-folder to /Applications, too - but did not figured out if thats correct or how to get it to work exactly....
(pic is made with/from Povray-example/tutorial after I got it installed)
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