[ODE] Generic Surface Contact Properties

[Philip Mayes]

Just did a quick search of q12.org (thanks google!)
and found thise thread from earlier this year :

http://q12.org/pipermail/ode/2005-February/015260.html

and continued here:

http://q12.org/pipermail/ode/2005-March/015263.html

It seems like it has all been done! Hope that answers
your questions.

Phil

--- Matthew Harmon <matt at ev-interactive.com> wrote:
> Hi all: 
> 
> I’m just starting to play with ODE and I’m trying to
> organize my thoughts
> regarding surface contact properties and was
> wondering if anybody had 2c to
> share about this issue. Here’s where I am: 
> 
> In a simple world I’d be able do define different
> surface types with values
> for mu, slip1, slip2, etc. Then, when two objects
> collide, I’d look up their
> surface data and combine them based on some
> algorithm, producing a
> convincing collision. Of course, that's not how the
> world works.  These
> values must be derived empirically on a pair-by-pair
> basis. In other words,
> there isn’t a simple equation to factor two surface
> "mu" values and come up
> with a good resulting mu for the contact. Or is
> there? 
> 
> - Has anybody had luck generating contact parameters
> by somehow combining
> values from two different surface descriptions?
> Something like
> mu=(muA*muB)/(muA+muB). I know an approach like this
> isn’t "correct", but
> perhaps something is close enough to produce a good
> "feel".
> 
> - Has anybody taken the approach of creating a big
> table containing
> hand-tuned values for the interaction of any two
> different surface types?
> 
> - For erp, cfm and bounce values I was thinking it
> may be good to just take
> the larger of the two values and use that.  i.e. a
> contact is always as
> squishy as it's squishiest object.
> 
> Any other thoughts would be most appreciated.
> 
> 
> 
> 
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> 
> 
> 

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