[Opensim-dev] llDetectedType and NPC's

[Dahlia Trimble]

So what happens when LL defines "NPC" and it means something different that
what is defined in OpenSimulator?

And yes, I believe the probability is quite high that they will eventually
define it.


On Wed, Jul 11, 2012 at 5:01 PM, Justin Clark-Casey <
jjustincc at googlemail.com> wrote:

> That's a neat solution, Argus.  Since the intention of
> OS_NPC_SENSE_AS_AGENT was to provide compatibility rather than 'fool', I
> think returning both NPC and AGENT flags would be perfectly acceptable.
>  Let's see if there are any other comments, otherwise I think we can
> proceed along those lines.  I'm still not that happy with extending
> llDetectedType() but leakage has already occurred and I suspect its
> inevitable.
>
> On another note, I'm not sure what 'plausibility' checks you're referring
> to.
>
>
> On 11/07/12 13:04, Argus wrote:
>
>> I am fully aware of the open source factor and that in each open grid
>> everything can be changed, which is why one always
>> needs backend function to make sure no fals information is passed on to
>> the central service. One can however filter 99%
>> of the fals data in the local sim which helps the central service because
>> it does not need to process every single
>> plausability checks. In a multi grid environment with closed grids we
>> even have a lower chance of false data beeing
>> passed than in a open grid only environment.
>>
>>   We have the same situations in opensim were the simulator often does
>> some local plausability checks before it send
>> data to the gridservers. The gridservers again do a plausability check
>> combined with other methods which are not
>> available on the local sim. Only if all steps are plausable the data gets
>> processed further.
>>
>> Anyway, I added a new patch for llDetectedType were NPCs always return
>> NPC and useing OS_NPC_SENSE_AS_AGENT will returns
>> AGENT + NPC. I think that is an acceptable compromize... I also added an
>> example script were the true NPC detection
>> always makes sense  ;)
>>
>>
>> Am 11.07.2012 02:01, schrieb Justin Clark-Casey:
>>
>>> Argus, if your system relies on always reliably identifying unique
>>> avatars then that is simply not possible in any
>>> OpenSimulator environment where simulators are controlled by third
>>> parties or where hypergrid travel is allowed.
>>>
>>> Even if OS_NPC_SENSE_AS_AGENT did not exist, then people would be able
>>> to compile a version of the code that did have
>>> that functionality. This is not about ideology - it's about what is
>>> physically possible!
>>>
>>> Equally, it is perfectly possible to create duplicate HG details -
>>> anything can be put in the agent data that comes
>>> from a foreign grid (justin at hg.osgrid.org or whatever).  You cannot
>>> rely on these to be unique either.
>>>
>>> Without any central authority (like DNS, the secure certificate
>>> infrastructure of something like Bitcoin block chains)
>>> it is simply not possible to uniquely identify avatars.
>>>
>>> I don't see this as much different from the web where one has to get
>>> people to create unique accounts with passwords
>>> in order to identify them later.  Such a thing has to be done in some
>>> authority system outside of OpenSimulator itself.
>>>
>>> If your point is that without OS_NPC_SENSE_AS_AGENT then the vast
>>> majority of systems would always present NPCs as
>>> NPCs (rather than agents) then I would agree.  In fact, in practice most
>>> people won't use OS_NPC_SENSE_AS_AGENT anyway
>>> as it's the option rather than the default.  But you cannot rely on
>>> uniquely identifying avatars on any environment
>>> outside those that you directly control.
>>>
>>> On a minor note, script functions that don't make any sense for NPCs
>>> should behave as if the UUID they received did
>>> not relate to a valid entity for that function.
>>>
>>>
>>
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>>
>>
>
> --
> Justin Clark-Casey (justincc)
> http://justincc.org/blog
> http://twitter.com/justincc
>
>
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