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Selecting "Generate Lightmap UVs" in the import settings of a model does what?

Creates new materials

Creates an additional set of UV coordinates for Lightmap data

Selecting "Generate Lightmap UVs" in the import settings of a model creates an additional set of UV coordinates specifically for lightmapping. Lightmaps are pre-calculated textures that store static lighting information, allowing for realistic lighting effects without the computational load during runtime.

When you enable this setting, Unity automatically generates a second UV layout that is used solely for lightmapping purposes. This is especially important to ensure that the lightmap can accurately represent the lighting and shadows on the model without interfering with the original UV layout, which is typically used for placing textures on the model.

The creation of these additional UV coordinates helps prevent texture seams and ensures that lightmaps cover the model correctly, optimizing the overall visual quality and performance of the game when it comes to static lighting.

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Merges mesh with lightmap

Optimizes textures

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