Hi… just to know
Can I, manually, select the polygons for each group?
to make my own polygroups (COLOR POLYGONS ZONES).
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picture attach
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Defining polygroups is usually done with a combination of using the mesh visibility functions:
http://docs.pixologic.com/user-guide/3d-modeling/modeling-basics/mesh-visibility/
and the Tool > Polygroup > Group Visible command. Hide everything you dont want, and group the visible polygons. There are a number of other commands in the Polygroup menu that can be useful in different situations to create polygroups.
For low-poly meshes, you can also use ZModeler with the “Polygroup” operation to manually assign the selected target to a polygroup.