Cinema4D atlas map

Has anyone figured out a proper workflow for creating an atlas map out of many objects without C4D redistributing the unwrapped UV's it's own way? Its packing method looks incredibly efficient but also makes it impossible to edit the atlas externally.

So far i've resorted to baking each texture separately, tiling them up in a grid in Photoshop and then matching that on the models through the texture offset function which takes forever but also wastes texture space on smaller models.

Any tips will be appreciated.

 

Oh boy. Unfortunately for me, I don't know how to use Cinema 4d.
Hopefully, one of the other Unity users, can help you here.