Well, it depends on how much you want to add to the worth of the model. We try now to add a texture map to all our models, we have many that do not have a texture map, but they have templates. Some, like our headstones, have no template or map. Those would be the 3ds, but they have the ability to have material. We are trying to keep up with things, but when we have time we are redoing all of our models. We want them all to have texture maps of their own someday...but it is slow going. So, it does depend on what you feel your time is worth and what do you think your model is worth, how easy it is to manipulate for others that may only have one software application....must try to think of others and what they have to be able to use your model. Well that sure was lengthy, sorry. Hope this helped a little...Sharen PS: my opionion, all should have maps and materials