As far as traditional multi-pass rendering,............Bryce doesn't do that.  I believe you are refering to apps like C4D, Lightwave, 3D Studio Max and the like,..........which may use seperate passes for such things as radiosity calculations, shadow maps, lens effects,  post render  effects and such,.............Bryce does not do this. With bryce you will have to render each layer by itself and composite them in the image editor of your choice(like Photoshop) with Object Mask renders. Hope this is what you are refering to.

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