MeshFilter有兩個屬性mesh和sharedMesh，從官方檔案和實際使用來說說這兩者的區別
MeshFilter檔案
Unity的MeshFilter檔案：https://docs.unity3d.com/ScriptReference/MeshFilter.html
| mesh | Returns the instantiated Mesh assigned to the mesh filter. |
|---|---|
| sharedMesh | Returns the shared mesh of the mesh filter. |
mesh訪問的是一個新的object(新實體)
sharedMesh是原始資源，所有實體的屬性共用同一份，也就是說修改它共用屬性全部實體都會發生改變，如果在編輯器下且直接對原始資源的sharedMesh進行修改，則原始資源也會發生改變，
使用情景
如果我們不需要修改mesh中具體的屬性，僅僅是對它賦值的話（比如從ab中加載出來進行設定或替換），那么使用sharedMesh
如果在Editor腳本開發中，需要修改mesh中的資料，則使用mesh
mesh檔案解釋
關于mesh的unity檔案解釋：
Returns the instantiated Mesh assigned to the mesh filter.
If no mesh is assigned to the mesh filter a new mesh will be created and assigned.
If a mesh is assigned to the mesh filter already, then first query of mesh property will create a duplicate of it, and this copy will be returned. Further queries of mesh property will return this duplicated mesh instance. Once mesh property is queried, link to the original shared mesh is lost and MeshFilter.sharedMesh property becomes an alias to mesh. If you want to avoid this automatic mesh duplication, use MeshFilter.sharedMesh instead.
By using mesh property you can modify the mesh for a single object only. The other objects that used the same mesh will not be modified.
It is your responsibility to destroy the automatically instantiated mesh when the game object is being destroyed. Resources.UnloadUnusedAssets also destroys the mesh but it is usually only called when loading a new level.
翻譯成中文如下：
如果一個mesh已經被分配給MeshFilter，那么第一次查詢mesh屬性會創建一個副本，這個副本會被回傳，進一步查詢mesh屬性將回傳這個復制的mesh實體，一旦mesh屬性被查詢，鏈接到原始共享網格會丟失，MeshFilter.sharedMesh屬性成為mesh的別名，如果你想避免這種自動生成副本，使用MeshFilter.sharedMesh代替，
通過使用mesh屬性，您可以僅修改單個物件的mesh，其他使用相同mesh的物件將不會被修改，
當游戲物件被銷毀時，銷毀自動實體化的mesh是你的責任，UnloadUnusedAssets也會破壞mesh，但通常只在Scene.LoadNewLevel時呼叫，
mesh偽代碼
猜測mesh的實作代碼大致如下：
public class MeshFilter ...
{
...
private Mesh _mesh;
public Mesh mesh
{
get
{
if (_mesh == null)
{
_mesh = new Mesh();
Copy(sharedMehs, _mesh);
}
return _mesh;
}
}
...
}
轉載請註明出處，本文鏈接：https://www.uj5u.com/qita/21352.html
標籤：其他