Creating an outline around a 3d mesh

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Caff

Hi everyone

Imagine I am rendering a 3d mesh as a background, then in front of that I would like to place a mesh as a pickable 3d GUI object.

However I would like to create a black 'outline' around the outer edges of the mesh to make it more distinguishable against the background - how should I achieve this? I imagine in involves some sort of trickery?

thanks