[Opensim-dev] Megaregions

[Oren Hurvitz]

Strong -1.

Varregions don't support ODE, therefore megaregions must remain.

It's important to keep support for ODE because it has significant benefits
over BulletSim:

Most importantly, ODE has consistently good performance, whereas BulletSim
sometimes gets into pathological states where it consumes extremely high
CPU and makes every avatar in the simulator freeze in place. I reported
this bug here: http://opensimulator.org/mantis/view.php?id=6789#c26617 ,
but it's still happening (I checked again last month). This is a huge
problem and it's the reason Kitely still uses ODE as the default physics
engine. (We provide BulletSim as an option, but we warn users against using
it.)

Second, BulletSim has some strange behavior that ODE doesn't. E.g., in
BulletSim my avatar can walk vertically up some large prims! That doesn't
happen with ODE.

Third, some users prefer ODE's behavior, and they have many scripts that
are fine-tuned for ODE. Switching to BulletSim would kill their scripts.

If Varregions supported ODE then it would be ok to eliminate megaregions.
But until that happens, megaregions are important and need to remain.

Oren


On Sat, Sep 5, 2015 at 2:35 AM, Diva Canto <diva at metaverseink.com> wrote:

> Yeah, don't worry, there's no rush. We'll wait for people's input.
> Eventually support for megaregions will be dropped. The question is whether
> to drop it on the next release or wait a few more months.
>
>
> On 9/4/2015 4:29 PM, Nicky Perian wrote:
>
> Diva,
> I don't have any technical input but, I don't think a complete input
> cannot be provided by posting this at the beginning of a 3 day holiday
> weekend in the US. Hopefully, a decision will not be made over this
> weekend.
> Nicky
>
> On Fri, Sep 4, 2015 at 5:34 PM, R.Gunther <rigun at rigutech.nl> wrote:
>
>> Yes, am fine with it when it get removed. it's not good.
>> But i expect some people that get sad because the still say megaregions
>> work betetr and use that.
>>
>> But Kill it ! :)
>>
>>
>> On 2015-09-05 00:29, Trinity wrote:
>>
>> KILL IT! KILL IT WITH FIRE!
>>
>> Trinity93
>>
>> On Fri, Sep 4, 2015 at 5:00 PM, Diva Canto < <diva at metaverseink.com>
>> diva at metaverseink.com> wrote:
>>
>>> Hi everyone,
>>>
>>> We're cleaning up a few things in the code, and came across megaregions.
>>> Now that we have varregions, there is a strong will among core devs to
>>> remove support for megaregions, because they were just a temporary hack for
>>> when viewers didn't understand spaces greater than 256m. Now that they do,
>>> the hack seems unnecessary moving forward. Megaregions implementation is
>>> contrived and makes a lot code unnecessarily complicated.
>>>
>>> Any objections to its removal?
>>>
>>> Diva
>>> _______________________________________________
>>> Opensim-dev mailing list
>>> Opensim-dev at opensimulator.org
>>> http://opensimulator.org/cgi-bin/mailman/listinfo/opensim-dev
>>>
>>
>>
>>
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-- 
Oren Hurvitz
VP R&D
Kitely Ltd.

Email: orenh at kitely.com <ilan at kitely.com>
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