I want to create a laser scanning effect similar to this;
I don’t want it to have a waving effect like that one; just a simple flat plane that scans the room. The tricky part is that I want it to outline every mesh object it intersects. Is there a simple way to do this for mobile?
I would use a projector with a cookie constraining it to a line.
A light with soft shadows would do a good job to.
As for the in air glow perhaps you should try and use a asset like Unity3D Extension: Volumetric Light Beam Kit - YouTube
A particle effect with world collision enabled and a submitter on collision?
Now that I write that down it could be rather expensive.