FastMeshCopy

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Zero-allocation copying of Meshes using the new MeshData functionality in Unity 2020.1+ .

FastMeshCopy 최신버젼 다운로드

최종 버전 다운로드 (.zip)

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# FastMeshCopy
Zero-allocation copying of Meshes using the new [**MeshData**](https://docs.unity3d.com/2020.1/Documentation/ScriptReference/Mesh.AllocateWritableMeshData.html) functionality in Unity **2020.1+**.

## JULY 2025 UPDATE
- **Testedwith Unity 6000.0.52f1 LTS**
- **BREAKING CHANGES:**
  - Refactored the project structure to conform to Unity package naming and folder conventions. The package must be added using a different name and path (See below).
  - The `CopyReplicate` method no longer creates a new Mesh. It accepts a reference to a Mesh object, just like the `CopyTo` method.

## API
The code comes in the form of the static class [`FastMeshCopy`](UnityProject/Assets/FastMeshCopy/Runtime/FastMeshCopy.cs) with the 
```csharp
public static void CopyTo(this Mesh inMesh, ref Mesh outMesh){...}
``` 
and
```csharp
public static void CopyReplicate(this Mesh inMesh, ref Mesh outMesh, NativeArray<float4x4> matrices) {...}
```
extension methods.  
Simply call this method on a Mesh instance to perform either a **Single Copy**, or a **Multi-Copy** based on an array of transformations + **Merge**.

## Add as a Unity Package
Add this line to your `Packages/manifest.json` file
```js
"com.ulc.fast-mesh-copy": "https://github.com/GeorgeAdamon/FastMeshCopy.git?path=/UnityProject/Packages/com.ulc.fast-mesh-copy#v2.0.0",
```

## Usage of the Single Copy example
- Attach the [MeshCopyExample.cs](UnityProject/Assets/Scripts/MeshCopyExample.cs) to a GameObject, and reference a Mesh in the inMesh field.
- Run the game, and press the **Spacebar** to perform the mesh copy.

## Limitations
Accessing BlendShapes and BoneWeights without GC allocations is not supported by Unity's API, so this zero-allocation effort **ignores** them for the time being. See the [**discussion**](https://forum.unity.com/threads/feedback-wanted-mesh-scripting-api-improvements.684670/page-3#post-5800297)

## Performance Example
Copying of a 98 MB mesh, creating only 80 Bytes of allocations for the Garbage Collector to clean-up.
![](https://raw.githubusercontent.com/g-adamopoulos/FastMeshCopy/master/img/profiler_result.jpg)

FastMeshCopy

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