Attached Link: http://www.best.com/~calyxa/pearl/materialtut/picts.html

any material that you have "imported into the mat section" was originally made with Bryce. a material is made up of a set of optical properties and anywhere from 0 to 4 texture components. 3d "procedural" texture components are edited in the Deep Texture Editor. 2d texture components can be composited into materials (and that's what the tutorial link is about, my tutorial on using picts in Bryce materials). once you have a material you like, you can save it to your material presets. once you've saved a material as a preset, you can then select it and click on 'export' to create a .mat file which other Bryce users can then "import into the mat section" of their Bryce... -calyxa

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Check out my Elemental Hexagons deck, created with Photoshop, Bryce, MojoWorld, and Poser