Rendering only shadows (blending the object out)

[melmaniace]

I want to render only the shadows, to blur them in the post. Or can I also blur it in XSI?
Raytracing looks good, but the rendertime is too high. Is it also possible to blur it?
Thomas123

[richard-sher]

The easiest way to render just the shadows is to create a shadow pass, or turn the objects primary rays off.

You can then blur that render in the FX tree.