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VolMeshNode: compute normals to avoid runtime warning

Martin Heistermann requested to merge fix-missing-normals into master

Fixes

warning: missing normals for lighting in renderobject: VolumeMeshNodeFaces
         Set shadeMode to SG_SHADE_UNLIT or provide normals!
warning: missing normals for lighting in renderobject: VolumeMeshNodeFaces
         Set shadeMode to SG_SHADE_UNLIT or provide normals!
warning: missing normals for lighting in renderobject: VolumeMeshNodeFaces
         Set shadeMode to SG_SHADE_UNLIT or provide normals!
[...]

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