I could be wrong, but I swear I saw somewhere an official measurement for a bryce unit.  Granted, it's all relative, but I'm wondering if it makes things like field of view, haze thickness, etc. easier to estimate.

Yes there is an actual Bryce Unit .I am at work at the moment and can't remember what it is. If you have the Bryce Bible (Real World Bryce 4) it's in there. If no one posts before I get home I'll post it then.

Cheers

GG 

It's (among other things) the dimensional unit (x,y,z axes) that an imported object will assume...;)

Bryce Units (BUs) are in the Bryce artist guide as:

Bryce Units Bryce maintains an invisible, absolute, infinite 3D grid internally. This grid is comprised of 3D cube increments, each of which is 20.48 x 20.48 x 20.48 "Bryce Units" (or BUs) in size. Most of the primitive objects (spheres, cubes, etc.) are created at the same size as a 3D cube.

is this what you are asking?

Attached Link: http://http://documentation.daz3d.com/bryce/Bryce_61_Artist_Guide_122807.pdf

Cheers

GG

corrected link:

http://documentation.daz3d.com/bryce/Bryce_61_Artist_Guide_122807.pdf

Unless something has changed, as far as I know it has no real world units.  I think this is what you were asking.

Thanks Annie, it was around 5.30am here when I done that.

Cheers

GG

Good Lord, my eyes are still crossed at 5:30 am    lol

you're very welcome.

Attached Link: http://forum.daz3d.com/viewtopic.php?t=125244&highlight=bryce+unit

Ok.  I'll let the default terrain be a thousand feet high, and therefore a cube, and a Bryce unit will be a thousand feet high.  Good luck with getting any good results with atmosphere, haze, etc.  How about if I make a Bryce unit equal one foot?  That's better but how accurate is the view from a 30 degree Bryce camera with that scale?

Granted, all these things are scalable, but there must be some very, very general guideline for scale, not that I'm going to adhere to that religiously.  Even Poser has it's Poser units which are equal to a certain amount.  Oddly enough, that means that most of the Poser figures are very tall in their default state.

Then again, and I really mean this, I could have dreamed that I read about what a Bryce unit equals!  But I'm still going to keep looking.  Someone got the figure of 8 feet here:

Speaking of Bryce Units and scale, I noticed right off in Bryce 7 Pro that when I create a terrain, it comes in small. I create a tree and it comes in much larger than the terrain! Bryce terrain and Bryce tree. Go figure.