Resolved NativeArray<>.Copy corrupts Data

I tried using the 2020.1 Mesh Api to create meshes and was wondering why the output is corrupt. after some digging i found that NativeArray Copy is the reason for this.

Code (CSharp):

1.  
2.                 meshdata.SetVertexBufferParams(vertexCount, MemoryLayout);
3.                 meshdata.SetIndexBufferParams(vertexCount, IndexFormat.UInt16);
4.  
5.                 var outputVertices = meshdata.GetVertexData<VertexData>();
6.                 var outputIndices = meshdata.GetIndexData<ushort>();
7.  
8.                 // Working Data
9.                 for (int i = 0; i < vertexCount; i++) {
10.                     outputVertices[i] = VertexDatas[i];
11.                     outputIndices[i] = Triangles[i];
12.                 }
13.  
14.                 // Corrupt Data
15.                 NativeArray<VertexData>.Copy(VertexDatas, outputVertices, vertexCount);
16.                 NativeArray<ushort>.Copy(Triangles, outputIndices, vertexCount);

using the Copy i get errors like

ArgumentException: Index buffer element #835 (value 16518) is out of bounds; mesh only has 8259 vertices.

UnityEngine.Mesh+MeshDataArray.ApplyToMeshAndDispose (UnityEngine.Mesh mesh, UnityEngine.Rendering.MeshUpdateFlags flags)

 

you are passing outputIndices twice instead of Triangles?

 

the fact i checked it multiple times and tried alternative without noticing this simple issue is more than just embarrassing... need to work on my focus

anyway thanks for the help