>> Has somebody invented a way of placing points in 3D space even though 
>> you only have a 2D edit area yet?
> 
> Most 3D modellers I've seen allow you to split the edit area into 4, 3 
> viewing orthogonally along each axis, and 1 perspective.  This allows 
> you to place points accurately in 3D, and of course check the "real" 
> look of the outcome interactively (yes all views update together in 
> real-time).

Most of the modellers I've seen *only* work in this way. (Blender 
apparently allows you to rejigger the display any way you see fit.)

It's still surprisingly easy to get "lost" in 3D space, or to draw stuff 
and then discover you didn't draw what you thought you drew.

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