Write a render method for soy.joints.Slider such that, when a material property is set, two straight cylinders are displayed connecting the two bodies, one inside the other. This should use a VBO and should look something like this:

They should provide proper normals, texcoords, and tangents such that many different kinds of materials can be used. The texcoords and tangents should wrap around the tubes, the two halves each getting half the texcoords.

Update the PySoy bindings for soy.joints.Slider for the new material property so this can be easily shown and tested.

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