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134 行
3.3 KiB
134 行
3.3 KiB
using System;
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using UnityEngine;
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#if UNITY_EDITOR
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using UnityEditor.Experimental.SceneManagement;
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#endif
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[ExecuteAlways, DisallowMultipleComponent]
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public abstract class MeshInstanceBehaviour : MonoBehaviour
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{
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public const string meshInstanceSuffix = "(MeshInstance)";
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[HideInInspector]
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public Mesh meshAsset;
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[NonSerialized]
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public Mesh meshInstance;
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protected virtual void OnMeshInstanceCreated() { }
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protected virtual void OnMeshInstanceDeleted() { }
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public void EnsureMeshInstance()
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{
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var smr = GetComponent<SkinnedMeshRenderer>();
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if (smr != null)
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{
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if (smr.sharedMesh == null || (smr.sharedMesh.GetInstanceID() < 0 && smr.sharedMesh != meshInstance))
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smr.sharedMesh = meshAsset;
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if (smr.sharedMesh != null && smr.sharedMesh.GetInstanceID() >= 0)
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smr.sharedMesh = EnsureMeshInstanceAux(smr.sharedMesh);
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return;
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}
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var mf = GetComponent<MeshFilter>();
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if (mf != null)
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{
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if (mf.sharedMesh == null || (mf.sharedMesh.GetInstanceID() < 0 && mf.sharedMesh != meshInstance))
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mf.sharedMesh = meshAsset;
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if (mf.sharedMesh != null && mf.sharedMesh.GetInstanceID() >= 0)
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mf.sharedMesh = EnsureMeshInstanceAux(mf.sharedMesh);
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return;
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}
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}
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Mesh EnsureMeshInstanceAux(Mesh mesh)
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{
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if (meshInstance != null)
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{
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Mesh.DestroyImmediate(meshInstance);
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meshInstance = null;
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}
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meshAsset = mesh;
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meshInstance = Mesh.Instantiate(meshAsset);
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meshInstance.name = meshAsset.name + meshInstanceSuffix;
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meshInstance.hideFlags = HideFlags.HideAndDontSave & ~HideFlags.DontUnloadUnusedAsset;
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meshInstance.MarkDynamic();
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//Debug.Log("ensureMeshInstance " + meshAsset.name + " -> " + meshInstance.name);
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OnMeshInstanceCreated();
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return meshInstance;
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}
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public void RemoveMeshInstance()
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{
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var smr = GetComponent<SkinnedMeshRenderer>();
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if (smr != null)
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{
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if (smr.sharedMesh == null || smr.sharedMesh.GetInstanceID() < 0)
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smr.sharedMesh = meshAsset;
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RemoveMeshInstanceAux();
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return;
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}
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var mf = GetComponent<MeshFilter>();
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if (mf != null)
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{
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if (mf.sharedMesh == null || mf.sharedMesh.GetInstanceID() < 0)
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mf.sharedMesh = meshAsset;
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RemoveMeshInstanceAux();
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return;
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}
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}
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void RemoveMeshInstanceAux()
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{
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if (meshInstance != null)
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{
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Mesh.DestroyImmediate(meshInstance);
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meshInstance = null;
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}
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OnMeshInstanceDeleted();
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}
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#if UNITY_EDITOR
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static MeshInstanceBehaviour()
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{
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PrefabStage.prefabSaving += (GameObject prefab) =>
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{
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var prefabStage = PrefabStageUtility.GetCurrentPrefabStage();
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if (prefabStage != null)
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{
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var meshInstanceBehaviours = prefab.GetComponentsInChildren<MeshInstanceBehaviour>(includeInactive: true);
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foreach (var meshInstanceBehaviour in meshInstanceBehaviours)
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{
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meshInstanceBehaviour.RemoveMeshInstance();
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//Debug.Log("reverted mesh instance for " + meshInstanceBehaviour.ToString());
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}
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}
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};
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PrefabStage.prefabSaved += (GameObject prefab) =>
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{
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var prefabStage = PrefabStageUtility.GetCurrentPrefabStage();
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if (prefabStage != null)
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{
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var meshInstanceBehaviours = prefab.GetComponentsInChildren<MeshInstanceBehaviour>(includeInactive: false);
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foreach (var meshInstanceBehaviour in meshInstanceBehaviours)
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{
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meshInstanceBehaviour.EnsureMeshInstance();
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//Debug.Log("reinstated mesh instance for " + meshInstanceBehaviour.ToString());
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}
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}
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};
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}
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#endif
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}
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