Unity SRP Batcher报错

在写SRP（unity版本2021.3.16）时出现了这样的报错内容

 Builtin property offset in cbuffer overlap other stages

多次尝试发现是因为UnityPerDraw只定义了unity_ObjectToWorld

CBUFFER_START(UnityPerDraw)
float4x4 unity_ObjectToWorld;
CBUFFER_END

 需要加上完整的定义，这每一条都不能少

CBUFFER_START(UnityPerDraw)
float4x4 unity_ObjectToWorld;
float4x4 unity_WorldToObject;
float4 unity_LODFade;
real4 unity_WorldTransformParams;
CBUFFER_END

猜测原因是需要保持和UnityShaderVariables.cginc保持一致，否则会覆盖原配置导致错误

建议是直接从UnityShaderVariables.cginc把这段拷贝出来

 注：UnityShaderVariables.cginc在{Unity安装目录}\Editor\Data\CGIncludes目录下