There's a lot of rotation axis in the hand so I needed to have an easy way for posing it.

With a clever group hierarchy (parent/children relation) it's possible to achieve a simple rigging system. But of course this system doesn't allow for Inverse Kinematics (IK) because it's only strictly hierarchical. So for animation purpose it wouldn't be well adapted. But I'm only doing posing in SketchUp... It's not an animation software.

At each rotation axis I added a "rotation handle" with a "default angle" and a "max angle" marks.
And I put all my handles on a different layer named "Rotations" so I can easily hide them by just hiding the layer.

Hand

In the "Ouliner" window on the left, you can see how my hierarchy is done.

I have expanded the hierarchy of the smallest finger (Auriculaire3) so you can completely see it.

Each nodes with a name starting with "CN_" are my "Control Nodes".
And each nodes starting with "RH_" are my "Rotation Handles".

Each "Control Node" contains the corresponding geometry of the model and the corresponding "Rotation Handle" to control it.

Let's take an example...

Have a look at "CN_Auric_C" (last phalange of the little finger). It contains :

  • the geometry of the phalange "Auric_C" wich is composed of two parts
    • "Auriculaire3_Ca" (red)
    • "Auriculaire3_Cb" (white)
  • the rotation handle to control it "RH_Auric_C"

I hope this will help you understand how to setup such a rigging system in your own SketchUp projects...

Hand
Right hand rigged with its "Rotation Handles"

With such a setup I'm able to pose the hand very easily and in a very short time.
All I have to do is rotate an handle and the corresponding geometry will rotate accordingly...

HandHandHand
The hand can now be posed very easily...

And here are 2 Kerkythea renders :

HandHand