I don't have the code but I do know what he did. Basically he used the second set of UV coordinates and applied the shadow with those UVs, adjusting the second set of UVs every frame according to a mapping plane facing the camera. It's a clever approach and makes a cool demo but is mostly useless in a full game for a couple reasons, such as you can only do one shadow.
SOFT SHADOW by Peter Scheutz
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