private void saveComposition(string filename)
{
TopoModel model = new TopoModel();
foreach (PrintModel stl in ListObjects(false))
{
stl.UpdateMatrix();
model.Merge(stl.ActiveModel, stl.trans);
}
if (filename.EndsWith(".obj") || filename.EndsWith(".OBJ"))
{
model.exportObj(filename, true);
}
else
{
model.exportSTL(filename, writeSTLBinary);
}
Slicer.lastBox.Clear();
Slicer.lastBox.Add(model.boundingBox);
}