If you create a Description with guides, you can use a Region Map to override how the guides interpolate the placement and behavior of primitives on the mesh.
For example, you can use a Region Map to create a part in a character's hair. Areas set by the map ensure that primitives close to the hair part are not influenced by surrounding guides. Otherwise, the guides would influence the primitive to cross the part in the hair.
Like other maps in XGen, you create a Region Map by generating a PTEX maps on the polygon surface. You can use the Paint 3D tool or Autodesk Mudbox 2012 (or later) to create the map. Region maps work best when you paint individual colors to define the regions on the mesh. Using a hard-edge brush ensures sharp boundaries between each region. For example, if you want to create a hair part on a scalp mesh, paint one side of the mesh blue and the other side red. The map forces primitives originating in red areas to ignore the guide interpolation in the blue areas and vise versa for primitives from the blue area.
You can use Region Maps to control the influence of guides with some Modifiers such as Clumping and Anim Wires.
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