This is a quick method for highlighting objects in-game without the need for post-process outlining.

When the player highlights an object (in this example by mousing over); the materials on the mesh are replaced by a duplicate highlight shader, in this case with some horizontal lines mapped in world space for a hologram kind of effect.

I’ve also put together a simple script which uses circuit-board style nodes which highlight specific points on an object and add an information box in screen space.