Free Bryce 3D Materials Downloads - Free for any use! Download to a temporary folder, unzip and save to a folder of your choice. Open Bryce 3D, create an object and click "Ctrl+M" or the "M" on the attributes menu to open the "Material Lab" Click the down arrow next to the upper left hand window to open the materials library. Click "User" then import and find and sellect the unzipped material file.