I´ve got the problem that some small rings appear on the surface of objects, which are placed very near to the centre of pointlights.
But this happens only when exported to a windows standalone.
Is there something I can do to avoid this effect?
Yes, they have. Shouldn´t they have shadows turned on?
I thougt, it would be nice, when the player can see his own shadow on the wall next to him.
The rings do not appear when running under OSX.
What you see is a self-shadowing artefact when the light is close to a flat surface (on some hardware it’s more visible than on other hardware). There’s just no easy way around that.
Oh, and point light shadows are really expensive to render. If you only need a shadow from a character, using something like Projector component would work much faster.