If you take a blank Bryce doc and create a basic terrain, you get a mountain 20.48 units high. Gives a scale of roughly 1 unit = 150 m. If instead you import a basic human figure, you get a figure standing 40.96 units high. Gives a scale of roughly 1 unit = 0.05 m. I'm curious as to whether other people try to work to a standard scale, and if so, which. Does anyone know if the Bryce designers had a standard scale in mind? My guess is that the first scale is closer to the intentional one, since with the second scale, an "eye-level" camera is actually toe-level. Personally I tend to work to the second scale.

Depends on the scale of the piece. High detail - 1 unit = 1 cm/inch depending. Low detail - 1 Unit = 100m I tend to try and keep to ratios simple to work with using mental arithmatic. Just decide whether to work in feet/inches or cm/m. Would be nice facility to set a scale default as part of the preferences - B5 feature maybe? Similar facility to Lightwave and 3ds. Dead simple and would save my poor brainf from all those nasty sums!