TRY THE DEMO!When trying to highlight an object, you'll find out there is no easy way to do that. Yes, there are some solutions out there but they are "image effects" and image effects are not optimized.
Outline Effect;
* Is easy to use
* Is blazingly fast, optimized.
* VR compatible.
* Has no visual difference from Unity Standard materials
* Has alpha channel so outlines can be animated elegantly.
This outline effect is fast, easy to use and controlled by objects themselves instead of camera.
And this outline shader has an identical look with the current Unity Standard Shader in your scenes. So you can use it without visual differences from your other Unity materials.