UnityEngine.Terrain.INTERNAL_CALL_AddTreeInstance C# (CSharp) Method

        private static extern void INTERNAL_CALL_AddTreeInstance(Terrain self, ref TreeInstance instance);
        [MethodImpl(MethodImplOptions.InternalCall)]

 public void AddTreeInstance(TreeInstance instance)
 {
     Terrain.INTERNAL_CALL_AddTreeInstance(this, ref instance);
 }