Copy from native array to managed ECS utility snippet

fastcopy.cs

public static unsafe void CopyToFast<T>(this NativeArray<T> nativeArray, T[] array) where T : struct {
    int byteLength = nativeArray.Length * UnsafeUtility.SizeOf(typeof(T));
    void* managedBuffer = UnsafeUtility.AddressOf(ref array[0]);
    void* nativeBuffer = nativeArray.GetUnsafePtr();
    UnsafeUtility.MemCpy(managedBuffer, nativeBuffer, byteLength);
}
 
// Usage
NativeArray<Vector3> nativeVertices = new NativeArray<Vector3>(vertexCount, Allocator.Persistent);
Vector3[] managedVertices = new Vector3[vertexCount];
nativeVertices.CopyToFast(managedVertices);

//From https://coffeebraingames.wordpress.com/2018/10/14/some-ecs-utility-scripts/