There are two methods of weight_map type rigging supported in DAZ Studio 4.x :
TriAx™ weight mapping
1) provides an extended flexibility that allows a high degree of creator control over complex, high quality bends. TriAx™ weight mapping allows the creation of :
1 weight map per bone rotation axis (X, Y, Z)
2)
1 weight map for bone scaling
3)
2 weight maps per joint rotation axis for bulge
4)
1 weight map for mesh area rigidity
5)
General, or “traditional”, weight mapping is a method that only allows a single weight map to control all axes of rotation and scale on a bone. This limits the degree of control but has the benefit of easier editing.
The weight mapping method used can be changed by converting a TriAx™ weight mapped figure to a General weight mapped figure by choosing Edit > Figure > Rigging > Convert TriAx Weight to General Weight from the Main Menu Bar.