Highlighting selected polygons on mesh at runtime

Hi all;

I’m just looking for guidance on the best path to follow for highlighting individual polygons on a mesh.

I can select the polygons and slap a texture mapped plane on there but I’m worried there’s a better, simpler, more performant way to do this than spawning a bunch of polygons, orienting them and then destroying them.

I’m wondering if there’s an easy way to change UVs, or change the vertex colors or something at runtime.