Here are - for me the best way - from a skinned model. It only shows the Skinn. I prefer to seperate the head from the rest of the body.

When I try to create the skin mapping with atlas mapping, I get only this:



What settings do you use?

Me too! In the Skin Editor i can´t see the model skinned!

Atlas Mapping with the whole model selected makes only sense for a shadow map.
For a character, you should choose pieces of the model, f.i. the face including the ears, the chin, the forehead and throat. Then you should get a reasonable mapping of it. Same with a hand or a leg choose one half of it.
This way your skin is separated in different bitmaps.
You can reduce the amount of needed place by erasing one half of the model, layout its UVs and afterwards copy, paste and mirror the other half to re-complete the model.
An absolutely different way is to export it to blender, where you select and save seams to get proper chunks of the mesh for mapping.

I tried once making the mappings for one part at a time, but when I for example select a hand, and use 2-side: front mapping on it, it will create mapping from the whole model... ?

Yes, 2sided mapping relates always to the whole model, not to the selected part. You need to use 6sided Mapping two times, one for the Upper' part of the hand, one for the 'inner' part of it.

Okay so it's 6 sided then? I will try it. Thank you a lot.