As far as the shadows being too sharp - it would be good to do some sort of pass (anti-aliasing) to "fuzzy them up" a bit to make it look better. But in terms of light penetration they are dead accurate.
As for being reusable, that''s definitely the case. After writing up the HTML I found it pretty easy to convert the code to render Milkshape models with shadows.
That''s all available in PortaLib3D... I think gamedev need a little plug icon at the top for me to put on all my posts
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Cheers!
Brett Porter
PortaLib3D : A portable 3D game/demo libary for OpenGL
