protected override void OnClearAllGeometryData()
{
base.OnClearAllGeometryData();
Normals?.Clear();
Normals?.TrimExcess();
TextureCoordinates?.Clear();
TextureCoordinates?.TrimExcess();
Tangents?.Clear();
Tangents?.TrimExcess();
BiTangents?.Clear();
BiTangents?.TrimExcess();
}