Bug [VFX Graph][Shader Graph][URP]Only one particle is drawn at a time in Single Pass Instanced

Verification Environment
- Unity 2021.2.8f1
- Visual Effects Graph 12.1.3
- Shader Graph 12.1.3
- XR Plug-in Management : MockHMD

Problem
When using VFX Graph and Shader Graph in a URP project, only one particle is drawn at a time in Single Pass Instanced environment.


Supplement
The problem does not occur in URP + Multi Pass or HDRP + Single Pass Instanced.

Reproduction Procedure
1. create a URP project
2. create the Shader Graph
3. Create VFX Graph
4. Change to Output Particle Mesh and set the Shader Graph created in step 2.
5. Set XR Plug-in management to MockHMD, and select Single Pass Instanced.
6. play Unity

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検証環境
- Unity 2021.2.8f1
- Visual Effects Graph 12.1.3
- Shader Graph 12.1.3
- XR Plug-in Management : MockHMD

問題
URPのプロジェクトでVFX GraphとShader Graphを使用した場合、Single Pass Instancedの環境では、パーティクルが1個ずつしか描画されない。

補足
URP + Multi Pass、HDRP + Single Pass Instanced では問題が発生しない。

再現手順
1. URPプロジェクトを作成する
2. Shader Graph を作成する
3. VFX Graph を作成する
4. Output Particle Mesh に変更して、2で作ったShader Graphを設定する
5. XR Plug-in management をMockHMDにして、Single Pass Instancedを選択する
6. Unity を再生する

 

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