[Opensim-users] short avatars make world bounce

[dz]

> From: InuYasha Meiji <inuyasha.meiji at gmail.com>
> To: opensim-users at lists.berlios.de
> Subject: Re: [Opensim-users] short avatars make world bounce
>
>
> Well the last time I felt brave about those numbers was a few versions
> back.  But found it a little rough.  I ened up unable to walk up the
> steps or climb ladders very well.  Maybe ime to try again?
>
> InuYasha.
>
>
>
> On 5/21/2012 4:48 PM, Justin Clark-Casey wrote:
> > If you're extremely brave, you could try adjusting some of the numbers
> > in [ODEPhysicsSettings] (copying from OpenSimDefaults.ini).  Lowering
> > m_avatarobjectcontact_bounce might be interesting, for example.
> > However, I haven't played much with these numbers so I'm not sure what
> > kind of effect that would have.
> >
> > On 20/05/12 06:30, InuYasha Meiji wrote:
> >> I was wondering if anyone else noticed this in 7.3.1, but my shorter
> >> then usual for secondlife avatar seems to make the
> >> world bounce all around it when I walk down my street. I have used
> >> this same AV for a long time and just noticed this
> >> going on. It is as if the world is one big trampoline now. Can
> >> anything be done, besides making taller avatars?
> >>
> >> InuYasha
>


I believe the bouncing is the result of the avatar "physics capsule"
interacting with the ground....
a small enough avatar design would result in the capsule ALWAYS coming in
contact with the ground....

As Justin indicated...there are a couple parameters in OPENSIM.INI related
to the physics of avatars...
I believe the parameter he MEANT to describe was...
    m_terraincontact_bounce = 0.05   ( instead of
"m_OBJECTcontact_bounce"... )

In addition to the one he mentions...   I would experiment with these
parameters in the [ODEPhysicsSettings] section ...

    ;girth of the avatar.  Adds radius to the height also
    av_capsule_radius = 0.37

    (try reducing this parameter to generate a smaller radius avatar
capsule)

I didn't see any reference to how long ago you used your short avatars, but
a while back the default for this parameter changed..
Maybe the old default works better for shorter avatars????

    ; specifies if the capsule should be tilted (=true; old compatibility
mode)
    ; or straight up-and-down (=false; better and more consistent physics
behavior)
    av_capsule_tilted = false

    (Use True instead of False)

You might also look to see what happens if you toggle this parameter  to
true....

    ; Filtering collisions helps keep things stable physics wise, but
sometimes
    ; it can be overzealous.  If you notice bouncing, chances are it's that.
    filter_collisions = false

Please note that these parameters are documented in OLDER versions of the
OPENSIM.INI file..
Apparently they have been removed from more current releases,  to "prevent
confusion"...

While I do agree that it is hard to balance "Ease of Startup" against full
disclosure of ALL the possible parameter changes,
This is one instance where removing them makes it  virtually  impossible
for a developer to do anything other than ask for help
and pray someone "remembers"  one of the now-hidden parameter options...
Personally,  I think that while you classify the
code as BETA, the benefits of exposing new users to ALL of the available
options GREATLY outweighs the difficulties of
documenting what they all impact...
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