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Assets/ThirdParty/Tools/CombineMeshs/CombineMeshs.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class CombineMeshs : MonoBehaviour
+{
+    public Transform root;
+    public bool isCombineSubmesh;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+}

Assets/ThirdParty/Tools/CombineMeshs/CombineMeshs.cs.meta

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Assets/ThirdParty/Tools/CombineMeshs/Editor.meta

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Assets/ThirdParty/Tools/CombineMeshs/Editor/CombineMeshsEditor.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEditor;
+using UnityEngine;
+
+[CustomEditor(typeof(CombineMeshs))]
+public class CombineMeshsEditor : Editor
+{
+    CombineMeshs inst;
+
+    private void OnEnable()
+    {
+        inst = (CombineMeshs)target;
+    }
+
+    public override void OnInspectorGUI()
+    {
+        base.OnInspectorGUI();
+
+        //
+        if(GUILayout.Button("CombineMeshs", GUILayout.Height(50)))
+        {
+            if(!inst.isCombineSubmesh)
+            {
+                AAA();
+            }
+            else
+            {
+                AAB();
+            }
+        }
+    }
+
+    void AAA()
+    {
+        List< CombineInstance > combineInstances = new List< CombineInstance >();
+        List<Material> materials = new List< Material >();
+        foreach(Transform t in inst.root.GetComponent<Transform>())
+        {
+            if(t.gameObject.activeSelf && t.GetComponent<MeshFilter>())
+            {
+                CombineInstance combineInstance = new CombineInstance();
+
+                combineInstance.mesh = t.GetComponent<MeshFilter>().sharedMesh;
+                combineInstance.transform = inst.root.worldToLocalMatrix * t.localToWorldMatrix;
+                combineInstances.Add(combineInstance);
+
+                materials.AddRange(t.GetComponent<MeshRenderer>().sharedMaterials);
+
+                t.gameObject.SetActive(false);
+            }
+        }
+
+        Mesh mesh = new Mesh();
+        mesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
+        mesh.CombineMeshes(combineInstances.ToArray(), false);
+
+        GameObject obj = new GameObject();
+        obj.transform.position = inst.root.transform.position;
+        obj.transform.SetParent(inst.root.transform);
+        obj.AddComponent<MeshFilter>();
+        obj.AddComponent<MeshRenderer>();
+
+        obj.GetComponent<MeshFilter>().sharedMesh = mesh;
+        obj.GetComponent<MeshRenderer>().sharedMaterials = materials.ToArray();
+    }
+
+    void AAB()
+    {
+        List<CombineInstance> combineInstances = new List<CombineInstance>();
+        List<Material> materials = new List<Material>();
+        foreach (Transform t in inst.root.GetComponentsInChildren<Transform>())
+        {
+            if (t.gameObject.activeSelf && t.GetComponent<MeshFilter>() && t.GetComponent<MeshFilter>().sharedMesh)
+            {
+                CombineInstance combineInstance = new CombineInstance();
+
+                for (int i = 0; i < t.GetComponent<MeshFilter>().sharedMesh.subMeshCount; ++i)
+                {
+                    combineInstance.mesh = t.GetComponent<MeshFilter>().sharedMesh;
+                    combineInstance.transform = inst.root.worldToLocalMatrix * t.localToWorldMatrix;
+                    combineInstance.subMeshIndex = i;
+                    combineInstances.Add(combineInstance);
+                }
+
+                //
+                for (int i = 0; i < t.GetComponent<MeshRenderer>().sharedMaterials.Length; ++i)
+                {
+                    if (!materials.Contains(t.GetComponent<MeshRenderer>().sharedMaterials[i]))
+                    {
+                        materials.Add(t.GetComponent<MeshRenderer>().sharedMaterials[i]);
+                    }
+                }
+
+                t.gameObject.SetActive(false);
+            }
+        }
+
+        Mesh mesh = new Mesh();
+        mesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
+        mesh.CombineMeshes(combineInstances.ToArray(), true);
+
+        GameObject obj = new GameObject();
+        obj.transform.position = inst.root.transform.position;
+        obj.transform.SetParent(inst.root.transform);
+        obj.AddComponent<MeshFilter>();
+        obj.AddComponent<MeshRenderer>();
+
+        obj.GetComponent<MeshFilter>().sharedMesh = mesh;
+        obj.GetComponent<MeshRenderer>().sharedMaterials = materials.ToArray();
+
+        Debug.Log("Done!");
+    }
+}

Assets/ThirdParty/Tools/CombineMeshs/Editor/CombineMeshsEditor.cs.meta

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