Trying to figure out what the best way would be to go about this. Say I have a model with 100s of vertices and I need to have the faces that are composed of 9 of those vertices to have a partially transparent color applied on top of the texture already used by those vertices. A good example of this would be something like a grid based tactics game where to denote your movable area, a transparent overlay is placed on top of areas in the map:
My initial thought was to pass a buffer of vertices to the vertex …