I have a method of importing meshes with separate collision meshes. In my import settings I click generate colliders. Before I make them a prefab I drag them in the viewport then I delete the collision meshes from the objects that are not named collision something. But I don't delete the mesh collider component because it says that I will lose my connection with the original model. Does unity discard these null mesh collider when playing or it costs something?
Am I doing it all wrong ?
In short I use one invisible mesh collider for all the objects and I delete from all the rest of the objects the mesh attached to the mesh collider component (but not the mesh collider component itself). I do that so I can keep ovewriting files from 3ds apps and update automatically my prefabs.