Real-time soft shadows without stencil buffers

Question

I'm really curious how to do this

_{(source: kortham.net )}

They seem to achieve soft real-time shadows on an iphone that does not have an available stencil buffer. It seems pretty fluid here http://www.youtube.com/watch?v=u5OM6tPoxLU

Does anyone have an idea?

Answer 1

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Answer 2

" ". http://en.wikipedia.org/wiki/Shadow_mapping