>> (BTW... Do you know of any real modellers that do? I realise 
>> theoretically somebody could make such a thing, but do you know of any 
>> real programs that do this?)
> 
> http://en.wikipedia.org/wiki/Parametric_feature_based_modeler
> 
> The property you're after is "paremetric modelling", where instead of 
> only being able to assign numerical dimensions, you can apply rules and 
> formulae based on any other dimensions.  Commonly you can do things like 
> "make sure this face remains parallel to this one", or "make this radius 
> half of this dimension" etc.  Then of course when you change one thing, 
> everything else updates.

I see...

The examples given seem to indicate that this is only a feature of 
extremely high-end CAD products though.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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