Help for render mesh with DrawProceduralIndirect

Hi, i'm trying render 3 triangles with DrawProceduralIndirect(), but it's not rendering anything.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.Rendering;
5.  
6. public class CreateProcedural : MonoBehaviour
7. {
8.     public Material _material;
9.     public ComputeShader shader;
10.    
11.     ComputeBuffer _cBuffer;
12.     ComputeBuffer _argBuffer;
13.  
14.     private void Start()
15.     {
16.         int kernel = shader.FindKernel("CSMain");
17.         _cBuffer = new ComputeBuffer(3, sizeof(float) * 3, ComputeBufferType.Append);
18.         _argBuffer = new ComputeBuffer(4, sizeof(int), ComputeBufferType.IndirectArguments);
19.  
20.         int[] args = new int[] { 0, 1, 0, 0 };
21.         _argBuffer.SetData(args);
22.         ComputeBuffer.CopyCount(_cBuffer, _argBuffer, 0);
23.  
24.         _argBuffer.GetData(args);
25.  
26.         Debug.Log("vertex count " + args[0]);
27.         Debug.Log("instance count " + args[1]);
28.         Debug.Log("start vertex " + args[2]);
29.         Debug.Log("start instance " + args[3]);
30.  
31.         shader.SetBuffer(kernel, "cBuffer", _cBuffer);
32.         shader.Dispatch(kernel, 1,1,1);
33.     }
34.  
35.     void OnRenderObject()
36.     {
37.         Graphics.DrawProceduralIndirect(
38.             _material,
39.             new Bounds(transform.position, transform.lossyScale * 5),
40.             MeshTopology.Triangles,
41.             _cBuffer, 0,
42.             null, null,
43.             ShadowCastingMode.Off, true,
44.             0);
45.     }
46.  
47.     void OnDestroy()
48.     {
49.         _cBuffer.Release();
50.         _argBuffer.Release();
51.     }
52. }

Code (CSharp):

1. #pragma kernel CSMain
2.  
3. AppendStructuredBuffer<float3> cBuffer;
4.  
5. [numthreads(3,3,1)]
6. void CSMain (uint3 id : SV_DispatchThreadID)
7. {
8.     float3 pos = id;
9.    
10.     cBuffer.Append(pos);
11. }

i'm having problem to find any link related.