kaom, Agent Smith in Bryce forum looked into this for Bryce. As you'd be working with texture maps you might be able to convert his ideas here as the modeler shouldn't matter as long as it is capable of mapping a texture map to an object. Bear in mind there's two ways to go: a texture map of your object, or a large "universe globe" with the hdri texture on it . For non commercial use only you could check out hdrishop to create fake hdri textures. Perhaps It's a bit much to expect it to work the same way in Bryce and Carrara, but it would give you some ideas to play with anyway. - TJ