If you want three non-disjoint 'parts' in Poser, you'll need to make it a figure.  Otherwise, it would need to be like a robot and be three separate parented props.  Poser doesn't have an inbetween - a prop that bends at groups.  You make each group a body part of a figure and the parts are welded which should remove the issue with color (which is an issue involving phong shading and continuity).

For something like this, PhiBuilder 2 is your easiest avenue.  You specify the hierarchy simply by number and indentation - for example:

objFile :Runtime:Geometries:MyGeometries:myobject.obj
1 shoulder yxz
        2 forearm yxz
               3 hand yxz

* Note that the group names must match the names in the .phi file!

Load the geometry, apply the .phi file using 'File->Convert Hier File' and you have your rough figure (you will need to configure the Joint Parameters with the Joint Editor to get the desired bending properties).  Welding should be automatic - that is, it is the default thing Poser does to body part groups is weld them.  You can check and control this in the Parameters window - Properties tab "Bend" enabled to weld.

I should also mention that some phong shading errors are the result of the facetting of the polygons.  UV Mapper is good for removing these shading errors using its Vertex and Normal menu actions.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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