Unity Game Optimization - Third Edition

Mesh scaling

The documentation clearly states that using negative scaling has a strange effect on dynamic batching. Negative scaling is often a quick way to mirror a mesh in our scene, which can save us from having to create and import a completely different mesh for something that's only flipped on one axis. This trick is commonly used for pairs of doors, or just to make a scene look more varied. However, if we only negatively scale the mesh on one or three axes, then it will be placed into a different dynamic batch than meshes that are negatively scaled on zero or two axes. It does not matter which of the three values (x, y, or z) are negative, only whether the total number of negative values is odd or even.

Another strange property of ...