Refactor pysoy/src/models/Billboard.pym into a new soy.bodies.Billboard class. The purpose of this special body is to display a material which always faces any Camera that renders it.

Beside overriding Body.mult_model_matrix, you'll have to build a small VBO of triangles (see Box.gs) as OpenGL ES1 does not support glBegin()/glEnd() style rendering or quads. You will need to support subdivision based on the size.

Update or write an example in Python which uses a Billboard and two cameras with two projectors side-by-side to show your work.

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When you've done, commit your work and post the resulting changeset url to this task.