yes you can import bryce4 into bryce5, and bryce supports the following formats: TrueSpace (.cob) Versions up to 4.0 are supported. Material properties are supported. VideoScape (.vsa) All versions are fully supported. VRML1 (.wrl) Imports all properties relevant to Bryce, including camera, light, and surface and material textures. LightWave (.lwo or .lws) Both objects and scenes are supported. The camera, lights, and all objects (with material information) are imported. Versions 6 and up are not supported. Heightfield (.hf) Used to import descriptions of heightfields (terrains). USGS DEM (.dem) All forms of DEM files are supported. USGS SDTS (.ddf) This format is the new USGS format which will replace DEM files. Portable Greyscale Map (.pgm) Used to import descriptions of heightfields (terrains). 3d Studio Objects (.3ds) 3DMF (.3mf) AutoCad (.dfx) Direct 3D (.x) Wavefront (.obj) WCS Elev (.elev) WorldToolKit (.nff)