[ODE] Generic springs for soft body dynamics

[Rob Ruck]

ball/socket joints are about the only ones that don't have some level of 
springiness. The hinge & universal joints have a bounciness factor, which 
might be all you need.

Otherwise, you can write your own spring constraint, seriously, it isn't very 
hard. I did a spring system (source code lost, or i'd send you it) for a cloth 
demo in a few hours, and I had barely started using ODE. There are loads of 
spring examples on the net that measure the distance between the two 
objects and apply forces to try and keep that distance. You will probably find, 
that a homemade one will also be faster, as it will not need to process 
anywhere near as much (I had a contraint density of 10x10 for my cloth demo, 
and that ran at 60+ fps, without any proper optimisations).

On 21 Mar 2004 at 2:01, W.J. van der Laan wrote:

> Hello,
> 
> I'm trying to model a mass/spring system in ODE, (for a cloth
> simulation) but I'm kind of confused by all the joint types. I assume the
> ball/socket joint models a 'spring' best? (it needs to be able to be
> stretched, but return to it's normal length in a 'springy' soft way..)
> 
> But I don't see a way to set the springyness of BallSocket joints.
> 
> Am I missing something obvious? (probably, as I'm kind of new to this
> stuff)
> 
> Please help...
> 
> Greetings, Wladimir
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--
Rob Ruck
mailto:bobruck at btinternet.com