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--- static_batching [2021/12/11 21:29] – [Lightmap UV Coordinates] guycalledfrank
+++ static_batching [2025/01/15 04:35] (current) – external edit 127.0.0.1
@@ Line 24: / Line 24: @@
 Static batching can actually work with manually provided lightmap scale/offsets, not coming from Lighting Data Asset. As renderer.lightmapScaleOffset and renderer.lightmapIndex are not serialized, make sure to always set this value every Awake() (and possibly Start()). This approach is used by the Bakery asset.
+===== Batching and MaterialPropertyBlocks =====
+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:
+{{ ::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}}
+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).
+An example, when using SRP batching:
+<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
+// 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. ((This CBuffer is already present in standard shaders of existing RPs.))