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====== Renderer Batching ======

There are a few different ways that Unity can combine meshes together, for optimization:
 - "Static Batching" - The checkbox in the Unity Player Settings
 - "Dynamic Batching" - A now-outdated mode of runtime batching. Not recommended. ((I can no longer find a player settings checkbox to even enable this feature))
 - "SRP Batching" - A [[https://blogs.unity3d.com/2019/02/28/srp-batcher-speed-up-your-rendering/|new]] runtime batcher for the SRP.

* See ''StaticBatchingUtility.Combine'' to batch meshes at runtime.

Static Batching in Unity creates a Read-Only mesh named "Combined Mesh (root: <root-game-object>)", with a [[Submesh]] for each batched renderer. Unity invokes a separate draw call for each range of indices within the combined mesh buffer.

Note that this means Unity does not actually render the entire batch in a single draw call. As they [[https://docs.unity3d.com/ScriptReference/StaticBatchingUtility.html|mention]], truly merging all meshes would make culling vastly less effective.

Instead, the performance comes from issuing fewer material / mesh change state operations (in OpenGL at least). In a lot of ways, this ends up being more similar to SRP [[Dynamic Batching]].

===== Lightmap UV Coordinates =====

The lightmap coordinates from [[lightingdataasset|Lighting Data Asset]] are baked into the Combined Mesh UV coordinates when the scene loads((I think this also happens **during** standalone build, not at runtime, but I'm not sure)). Afterwards, querying ''meshRenderer.lightmapScaleOffset'' **will** return the old scale and transform, even though it has been baked into the mesh. Technically, in the render pipeline, all of these meshes have a lightmapST (scale/transform) of '(1,1,0,0)'. ((It shows the scale and transform it loaded from the LightingDataAsset file for that renderer.))

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