Project a small alphablended circle shadow

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What's the fastest way to project a small alpha blended circle shape shadow on a nonflat 3d object?
I don't need stencil of course.
Thank you :)

Don't know what's the fastest way, but in the archives there are several approaches. And sswifts shadow lib could handle this too.

http://www.blitzbasic.com/codearcs/codearcs.php?code=214

^ This works very well, but be careful with very complex floor geometry.

I tried flex method today and it worked!
But to achieve a good effect I have to segment the shadow face a little more...I have to think what is better.