[sldev] Hacking the wind

[Vector Hastings]

The big limitation is that llSetLinkPrimitiveParams pauses the script for .2
seconds, so there would need to be multiple scripts running in the base prim
to modify something with as many prims as hair (sometimes over a hundred
flexis), and that's not only cumbersome but lag-inducing for general use.

That said, I am planning a hair script to do much this idea, but for
explosions -- stuff that's violent, because I think even the best scripted
solution probably will have a hard time creating the smoothness of wind.
(Also, wind blows in the same direction for everyone, but explosions blow
out from a source.)

(If you know of a script that would do this, I'd be happy to purchase and
save the coding time for something else.)

Thanks,

Vector

-----Original Message-----
From: sldev-bounces at lists.secondlife.com
[mailto:sldev-bounces at lists.secondlife.com]On Behalf Of Tigro
Spottystripes
Sent: Sunday, July 26, 2009 8:29 AM
To: Vector Hastings
Cc: Second Life Developer Mailing List; Sheet Spotter
Subject: Re: [sldev] Hacking the wind


just changing the force for all flexies with llSetLinkPrimitiveParams
wouldn't give the effect you want? or there are some prims in the
linkset that aren't flexies?

Vector Hastings escreveu:
> thank you sooo much Sheet. This is very helpful.
>
> I probably need to noodle on which way to go with the value, a constant
will
> be easy but crude, and might help my current circumstance.
>
> Ultimately I'd like to cue the wind to blow an actress' hair at just the
> right moment. So I have to think out how to communicate the right moment
to
> the viewer.
>
> Thanks again,
>
> Vector
>
> -----Original Message-----
> From: Sheet Spotter [mailto:sheet.spotter at gmail.com]
> Sent: Saturday, July 25, 2009 3:18 PM
> To: 'Vector Hastings'
> Subject: RE: [sldev] Hacking the wind
>
>
> All of the comments below are based on the source code from Linden Lab's
> Snowglobe viewer. The Snowglobe viewer is very similar to their main
viewer,
> so all of the same comments should apply to the main viewer.
>
> Wind effects on flex-prims are likely added in this line...
>     mSection[i].mPosition += gAgent.getRegion()->mWind.getVelocity(
> mSection[i].mPosition ) * wind_factor;
>
> ...in the LLVolumeImplFelxible::doFlexibleUpdate method within the
> "indra/newview/llfexibleobject.cpp" file.
>
> If you want the wind to have a constant velocity and direction you could
try
> replacing the
"gAgent.getRegion()->mWind.GetVelocity(mSection[i].mPosition)"
> portion with a constant.
>
> The only place I could find that modified the wind value for the region
was
> this line...
>     datap->mRegionp->mWind.decompress(bit_pack, &goph);
> ...in the LLVLManager::unpackData method within the
> "indra/newview/llvlmanager.cpp" file. Modifying this line would ensure the
> same wind effect applied to every type of object (flexi, sky, trees,
etc.).
>
> If you wanted to get really fancy, you might even be able to do cool
tricks,
> like simulate a tornado. LOL
>
> I hope this helps. Enjoy!
>
>
> Sheet Spotter
>
>
> -----Original Message-----
> From: Vector Hastings [mailto:vector at leafpile.com]
> Sent: July 25, 2009 4:07 PM
> To: Sheet Spotter
> Subject: RE: [sldev] Hacking the wind
>
> Great, Thanks.
>
> Knowing what to look for is half my battle.
>
> I'm trying to control the direction flexi-prims are waving (hair and flags
> for filming machinima).
>
> Thanks again,
>
> Vector
>
> -----Original Message-----
> From: Sheet Spotter [mailto:sheet.spotter at gmail.com]
> Sent: Saturday, July 25, 2009 12:09 PM
> To: 'Vector Hastings'
> Subject: RE: [sldev] Hacking the wind
>
>
> A global search through the code for "gWindVec" identified a few
interesting
> areas of the code. A search for "mWind" found other interesting areas.
>
> It depends really on what you are trying to achieve.
>
>
> Sheet Spotter
>
> -----Original Message-----
> From: sldev-bounces at lists.secondlife.com
> [mailto:sldev-bounces at lists.secondlife.com] On Behalf Of Vector Hastings
> Sent: July 25, 2009 5:23 AM
> To: Second Life Developer Mailing List
> Subject: [sldev] Hacking the wind
>
> Does anyone know where wind direction and speed could be hacked in the
> viewer?
>
> Thanks to any and all,
>
> Vector
>
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