[OpenSCAD] unit of measure

[Hugh Smith]

I'm new to OpenSCAD and am trying to modify some RepRap parts and am having a difficult time understanding the unit of measure used by OpenSCAD.  For instance the command;

cube [1,2,3]

means draw a cube of dimension 1w x 2l x 3h.  1,2,3 what? Are they mm, cm, inches.  What happens when I print a file as meteric vs. sae?

Sorry for appearing so dumb but I can't figure it out or find any documentation explaining the units used.

Hugh
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