Bryce doesn't store alpha channels within the images or animations themselves. If you're looking for a photoshop-compatible 4th, 5th, 6th, etc. channel (such as produced by Ray Dream Studio when exporting to Photoshop files when certain render options are turned on), then you're out of luck. Bryce doesn't support this option. The best you can do is a mask animation render, and then composite it with the full animation in a post-processing program, such as AE or Premiere. This should be relatively straightforward... if you export as a TIFF sequence, and use Photoshop version 4 or later, you can automate the process somewhat using the History/Actions tools in Photoshop, and it's just a matter of bringing in each frame and adding the appropriate mask channels to it, from the auxiliary mask render you did in Bryce. I would assume that Premiere and After Effects have a similar capability for animations for importing channels. A Mask Render renders only the silhouettes of any selected objects, including such effects as occlusion (but NOT complex occlusion such as partial transparency, fuzzy render settings, etc). --flick