Write a render method for soy.joints.Fixed such that, when a material property is set, a straight square bar is displayed connecting the two bodies. This should use a simple VBO.

While only 8 verticies are needed (ideally more for slightly rounded edges), 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 bar.

This method should be override to a virtual method in soy.joints.Joint. Scene will need a list of joints it contains to render them. As such, the actual render function is easy while setting up the rendering chain with Scene may take a bit longer. Later Joint Visual tasks will not need to do that work but have more complex rendering functions.

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

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