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static_batching [2021/05/02 16:08] 167.114.64.97 old revision restored (2021/02/11 22:12) |
static_batching [2021/12/11 21:43] guycalledfrank [Batching and MaterialPropertyBlocks] |
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- | ====== | + | ====== |
- | * See '' | + | There are a few different ways that Unity can combine meshes together, for optimization: |
+ | | ||
+ | * " | ||
+ | * "SRP Batching" | ||
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+ | Note that none of these options actually combine meshes together. They will all result in the same number of graphics API drawcalls. Instead, the purpose of batching is to optimize the order of drawcalls to avoid changing state between calls. | ||
+ | |||
+ | ===== Static Batching ===== | ||
+ | |||
+ | Static Batching in Unity creates a Read-Only mesh named " | ||
+ | |||
+ | Note that this means Unity does not actually render the entire batch in a single draw call. As they [[https:// | ||
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+ | 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]]. | ||
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+ | Static batching is done at build-time, so mobile developers should be aware that static batching can unexpectedly increase your build size. Static Batching can result in significantly more mesh data being generated, if many batch meshes are created. | ||
+ | |||
+ | ==== 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 '' | ||
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+ | Static batching can actually work with manually provided lightmap scale/ | ||
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+ | ===== Batching and MaterialPropertyBlocks ===== | ||
+ | |||
+ | Static and SRP batching is incompatible with MaterialPropertyBlocks, | ||
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+ | This is the data sent by the SRP batcher for each draw call: https:// | ||
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+ | This data is efficiently managed by the engine and uploaded to the GPU as fast as Unity can. The idea is to abuse some of these built-in values to pass custom data. Good candidates are '' | ||
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+ | When using custom SRP and SRP batching, the recipe is following: | ||
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+ | '' | ||
+ | <br> | ||
+ | '' | ||
+ | <br> | ||
+ | |||
+ | For custom SRPs: '' | ||
+ | <br> | ||
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+ | On the GPU you should have a UnityPerDraw cbuffer with float4 unity_DynamicLightmapST in it, and it will be filled with custom data. | ||
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+ | Note that the " |