how to use sub mesh mask in mesh output in Visual Effect Graph?

In my hdrp project, I want to use VEG to make some particles fx. And I find sub mesh mask, it seems can make some particle fx with animation(to my understanding).
But I can't search any information from google, and I download the Unity-Technologies ScriptableRenderPipeline/com.unity.testing.visualeffectgraph in Github, but also nothing helpful.

Is there anyone used this before? could you please give me some advice or instruction?

I'm not a native speaker, feel free to ask me if there is anything confused you.
Welcome to communicate in Chinese.

 

thank you very much! And I figure it out with your instruction. But I hope we could increase the maximum number of submeshs.

 

How do I make a mesh with 2 submeshes?) I literally have no idea! In blender u either output a mesh or several meshes in 1 file.

 

hi here is a Submesh creator, you can use it inside unity to create submeshes.

 

Code (CSharp):

1. using UnityEngine;
2. using UnityEditor;
3. using System.Collections;
4. using System.Collections.Generic;
5.  
6. [ExecuteInEditMode]
7. using UnityEngine;
8. using UnityEditor;
9. using System.Collections;
10. using System.Collections.Generic;
11.  
12. [ExecuteInEditMode]
13. public class SubMeshCreator : MonoBehaviour
14. {
15.    public bool create = false;
16.    private Mesh newMesh;
17.    void Start()
18.    {
19.  
20.    }
21.  
22.  
23.    void Update()
24.    {
25.        if (create)
26.        {
27.            create = false;
28.            Matrix4x4 matrix = transform.worldToLocalMatrix;
29.  
30.            //网格数组
31.            MeshFilter[] meshFilters = this.GetComponentsInChildren<MeshFilter>();
32.            CombineInstance[] combineInstances = new CombineInstance[meshFilters.Length];
33.            Debug.Log(meshFilters.Length);
34.            for (int i = 0; i < meshFilters.Length; ++i)
35.            {
36.                combineInstances[i].mesh = meshFilters[i].sharedMesh;
37.                combineInstances[i].transform = meshFilters[i].transform.localToWorldMatrix * matrix;
38.            }
39.  
40.            //材质数组
41.            Material[] materials = new Material[meshFilters.Length];
42.            MeshRenderer[] meshRenders = this.GetComponentsInChildren<MeshRenderer>();
43.            for (int i = 0; i < meshRenders.Length; ++i)
44.            {
45.                materials[i] = meshRenders[i].sharedMaterial;
46.            }
47.  
48.            //新建网格容器
49.            newMesh = new Mesh();
50.            newMesh.name = "newMesh";
51.            //新网格赋值给当前mesh
52.            MeshFilter mf = this.GetComponent<MeshFilter>();
53.            mf.mesh = newMesh;
54.            //合并网格
55.            newMesh.CombineMeshes(combineInstances, true); //第二个参数的意思，如果为false，则表明有多个材质；如果是true，则表明一个材质。
56.                                                            //如果是false的话，合并完的Mesh，那么就会有多个submesh，理应对应多个Material。
57.                                                            //如果是true的话，那么合并完的mesh就只有一个submesh，理应对对应1个Material。
58.                                                            //材质赋值
59.            MeshRenderer mr = this.GetComponent<MeshRenderer>();
60.            mr.sharedMaterials = materials;
61.  
62.            SaveAsset(newMesh);
63.        }
64.    }
65.  
66.  
67.  
68.    void SaveAsset(Mesh mesh)
69.    {
70.        AssetDatabase.CreateAsset(mesh, "Assets/" + name + ".asset");
71.    }
72. }
73.