Unity Game Optimization - Third Edition

Using simpler primitives

Most shapes can be approximated using one of the three primitive colliders. In fact, we do not need to represent the object using only a single collider. We are free to use several colliders if they serve our needs for creating a complex collision shape by attaching additional child GameObjects with their colliders. This is almost always less expensive than using a single Mesh Collider and should be preferred.

The following screenshot shows a handful of complex graphical objects represented by one or more simpler primitive collider shapes:

Using a Mesh Collider for any one of these objects would be significantly more ...