Atmospherics and Render Effects:

You can have Atmospherics and Render Effects assigned per pass. This is accomplished by RPM controlling the Enabled state of the atmospherics and render effects in the scene on a per pass basis, rather than creating and deleting items.

The basic steps are to create all the atmospherics and render effects you need for the scene, and then enable or disable them for each pass as needed using the Atmospherics or Render Effects rollouts in the RPM interface.

Quicktime Movie demonstrating using per pass Render Effects. 2.1meg (zip 549k)