Lightmaps are pre-calculated lighting textures that store illumination for static geometry. Unity generates them via a multi-step process that transforms 3D mesh data into optimized 2D textures. Both the Realtime Global Illumination system and the Baked Global Illumination system use lightmaps, and therefore need lightmap UVs.
| Page | Description |
|---|---|
| Lightmap generation process | Learn how Unity generates lightmaps. |
| Baked lightmap UVs | Learn how baked lightmap UVs are per-mesh so all instances share the same UVs. |
| Real-time lightmap UVs | Learn how Unity computes real-time lightmap UVs. |
| Generating lightmap UVs | Generate lightmap UVs on import or use your own. |
| Lightmap packing | Learn how Unity packs lightmaps and select the Unity lightmap packer. |
| Check lightmap UVs | Check real-time and baked lightmap UVs. |
| Lightmap UVs reference | Learn about the model import settings. |