Lightmapping Prefabs in Unity 2018

My fork of Joachim Ante's solution for attaching lightmaps to runtime instantiated prefabs in Unity 5+, posted on the Unity forums here: https://forum.unity.com/threads/problems-with-instantiating-baked-prefabs.324514/

The goal is to make something more organized and robust out of it.

Baking lightmaps into prefabs can be a major optimization for mobile and VR runtime procedural environments.

• Tested with Unity 2018.2.6f1

  • Unknown if it will work in other versions.

• Add PrefabLightmapData.cs to the top level of a prefab.

  • Prefab must be have all Static flags except Batching Static.

• Put the prefab in a scene and bake a non-directional lightmap.

  • Bake scene should have the same Lighting settings as the scene you intent to instantiate the prefab into.
  • Bake scene must have auto baking off.
  • Bake scene must be included in the build scenes list.

• Still in the bake scene, run Assets > Bake Prefab Lightmaps

• Instantiate the prefab at runtime in any scene you want.