How to pass different colors to instances when using BatchRendererGroup?

Hi guys,
I just downloaded 2019.3.b7,I found unity had extended the APIs of BatchRendererGroup. Such as GetBatchVectorArray(batchid,paramName) .....I guessed it means to fetch a array that should be passed to the shader's param.I filled the returned array with different colors on every instance. But nothing happend. What's wrong?

Here's my codes:

Code (CSharp):

1. var    _batchIndex = _batchRendererGroup.AddBatch(
2.             mesh,
3.             0,
4.             material,
5.             0,
6.             ShadowCastingMode.Off,
7.             false,
8.             false,
9.             new Bounds(Vector3.zero, Vector3.one*2000  ),
10.             InstanceCount,
11.             property,
12.             gameObject);
13.  
14.   var colors = _batchRendererGroup.GetBatchVectorArray(_batchIndex, "_Color");
15.   for (int i = 0; i < InstanceCount; i++)
16.     {
17.             colors[i] = new float4( i/ (float)InstanceCount  ,
18.                                     i/ (float)InstanceCount  ,
19.                                     i/ (float)InstanceCount  , 1.0f);    
20.   }

[Wrong result:]

 

Does this code even compile? I guess it should the emit an error like:

PS: If you post code, please use code tags to make it easier to read.

 

The property you are setting must be set up for instancing in the shader. Shader Graph support should come with 7.2 and DOTS will use this in 0.2.

There are implicit conversions between float4 and Vector4.

 

Thanks for reply.

 

The original code assigned a float4 to a NativeArray, rather than to a NativeArray index. That's why I was skeptical if the code even compiles. I guess the forum just screwed up the code due to the missing code-tags in the original post, but he/she edited the post in the meantime and the syntax looks fine to me now.