private static extern void INTERNAL_CALL_GetInterpolatedNormal(TerrainData self, float x, float y, out Vector3 value); [MethodImpl(MethodImplOptions.InternalCall)]
public Vector3 GetInterpolatedNormal(float x, float y) { Vector3 result; TerrainData.INTERNAL_CALL_GetInterpolatedNormal(this, x, y, out result); return(result); }