azl is using Bryce3D, and the export feature wasn't added until version 4. The export 'Easter Egg' that Paul refers to is a nifty feature which allows you to export certain objects other than terrains. Those certain objects have to be a polygonal mesh. These include stones, the 'Imported Object' objects in the create menu, and any normal polygon model which you might have imported yourself. The ability to export models that have been imported makes Bryce4 quite a reasonable file converter. Bryce4 does create an mtl file along with an OBJ export. You cannot export Bryce primitives, or Boolean combinations of them. Bryce materials do not export well, and exported terrains with them applied are a pale imitation of the subtlety available in Bryce renders.