Shadow on a transparent background?

I’d like to render a model, complete with shadows, on a surface that is transparent so the shadow has a partial transparency.

If that makes sense :wink: is it possible?

Thanks

Another way to put it is how do you retain the shadows on a surface that isn’t there?

If i understand you want the shadow only button in materials.

That sounds ideal but I can’t see that option when cycles render is selected?

I’m doing some searching and found this…

http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=45242

Is that what I want?

Apparently shadows only render is in the latest version by default. Just got to find it :frowning: