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--- static_batching [2021/12/11 21:40]
guycalledfrank [Lightmap UV Coordinates]
+++ static_batching [2021/12/13 19:18] (current)
uninomiconadmin
@@ Line 27: / Line 27: @@
 ===== Batching and MaterialPropertyBlocks =====
-Static and SRP batching is incompatible with MaterialPropertyBlocks, meaning you can't set per-object (not per-material) parameters without losing it. However, there is a hacky workaround, at least tested with SRP batching.
+Static and SRP batching is incompatible with MaterialPropertyBlocks, meaning you can't set per-renderer (not per-material) parameters without breaking batching. However, there is a hacky workaround, at least tested with SRP batching.
-This is the data sent by the SRP batcher for each draw call: https://blog-api.unity.com/sites/default/files/2019/02/Screen-Shot-2019-02-27-at-3.50.52-PM.png
+This is the data sent by the SRP batcher for each draw call:
-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.
+{{ ::screen-shot-2019-02-27-at-3.50.52-pm.png?400 | https://blog-api.unity.com/sites/default/files/2019/02/Screen-Shot-2019-02-27-at-3.50.52-PM.png}}
-When using custom SRP and SRP batching, the recipe is following:
+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 ''unity_DynamicLightmapST'' (Enlighten data, still uploaded even if non-Enlighten lightmaps are used) and ''unity_RenderingLayer'' (its value is directly alterable in MeshRenderer UI).
-''renderer.realtimeLightmapIndex = 0; // forces "real-time lightmapped" behaviour on the renderer (also not really required on objects using a regular static lightmap)''
+An example, when using SRP batching:
-''renderer.realtimeLightmapScaleOffset = Vector4 of custom data''
+<code csharp>
+renderer.realtimeLightmapIndex = 0; // forces "real-time lightmapped"" behaviour on the renderer (also not really required on objects using a regular static lightmap)
+renderer.realtimeLightmapScaleOffset = ...; // Vector4 of custom data
-''drawingSettings.perObjectData = PerObjectData.Lightmaps | otherStuffYouNeed;''
+// For custom SRPs:
+// (Only relevant for custom SRPs; in existing RPs it should likely just work as is, as they all support lightmapping in the main pass)
+drawingSettings.perObjectData = ...; // PerObjectData.Lightmaps or otherStuffYouNeed;
+</code>
-On the GPU you should have a UnityPerDraw cbuffer with float4 unity_DynamicLightmapST in it, and it will be filled with custom data.
+On the GPU you should have a ''UnityPerDraw'' cbuffer with ''float4 unity_DynamicLightmapST'' in it, and it will be filled with custom data. ((This CBuffer is already present in standard shaders of existing RPs.))
-Note that the "drawingSettings" settings is only relevant for custom SRPs; in existing RPs it should likely just work as is, as they all support lightmapping in the main pass anyway.

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