Attached Link: http://www.renderosity.com/tut.ez?Form.ViewPages=319

Another approach was shown off in the Poser Forum--the essential point was to set up the scene, then select *everything* (with appropriate grouping) and reduce the z-scale of those items. Check the tute listed in the link; should be easily adaptable to Bryce.

RosemaryR
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"This...this is magnificent!"
"Oh, yeah. Ooooo. Aaaaah. That's how it starts.
Then, later, there's ...running. And....screaming."