Re: Quesa/RB3D Question

[Nick Lockwood <nick at charcoaldesign dot co dot uk>]

> Well, that *does* let RB do the math for you (in fact, that's pretty 
> much all a Group3D is -- a way of changing rotating one or more 
> objects relative to some different origin).
In the documentation Group3D's are described as being computationally 
expensive (not a direct quote). I always wondered about this - it seems 
a little vague. Computationally expensive relative to what exactly?
Relative to doing the math to move and rotate multiple objects 
yourself? Seems hard to believe.
Relative to moving a single object? Well duh! But it should still pale 
in comparison to the additional overhead of say, drawing the extra 
objects in the first place.
In either case having done a fair bit of this myself with fairly clunky 
math in places (i.e. sin and cos rather than quaternions or matrices) 
without any significant performance hit I'm struggling to see why this 
would ever be a significant performance issue.
Perhaps Joe could clear this up?

Nick

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