I updated my raytracer to not cast shadows if the collided object has a texture that has a 0-value alpha channel, which means, I get cooler shadows cast from my textured objects!
Yay!
Next item needing attention is shadow-testing rays.
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awesome
The old picture is http://mt-wudan.com/projects/pySettlers/shot0703.png – I was used to the black squares, but the new pic is how I originally planned it.