some nodes cleanup

[Alessandro Padovani]

Usually normal and radius values are hidden for node inputs. It makes little sense to expose the vector values since they’re not for manual input.

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[Thomas Larsson]

Implemented for normals, but not for radius. The only node that has a radius input is the translucency group, and tweaking it is not totally meaningless, so I think it should be left unhidden.

[Alessandro Padovani]

Commit 86649b3 works fine.