On terrains, IMHO there is little difference between the programs. (Not counting shader/material issues). However, when creating non-organic shapes, at least for me, Bryce is easier to work with for mesh generation from grayscale images. My pet peeve in Carrara is that you can't easily eliminate the square portion of the imported grayscale. In Bryce, you just pull up the slider control and presto, it's gone. Also, lattice generation is easier in Bryce. I wouldn't want to try to generate these wheel objects with booleans. It can be done with spline modeling but is labor intensive. Grayscale mesh generation is by far the easiest way to handle objects like these. I guess this should go on my Carrara Wishing Well list! :) Mark