/// <summary>
/// Clean the content of the structure fields to get ready for next export.
/// </summary>
public void Clean()
{
scene = null;
meshes.Clear();
progress.Clean();
}
/// <summary>
/// Clean the content of the structure fields to get ready for next import.
/// </summary>
public void Clean()
{
filename = null;
path = null;
scene = null;
id = 0;
progress.Clean();
}