Pre3D doesn't include any "picking" support, mostly because there are
a few different ways you can approach it, and it depends on what
you're trying to do and what your objects are like. The two easiest
strategies are "color picking". This is where you assign each face of
your cube a different color, and draw into an offscreen canvas. You
then just look at the pixel where the mouse was clicked, and you map
the color to the face. If you need to know where on a specific face,
or if you want to do it in another approach, you would generally do a
ray / face interaction test. I would personally try first doing color
picking, I think it should be pretty easy in your situation.
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