Hi Robert,
I've looked into this a little further. It appears the changes you made
to ParticleSystem.cpp on March 17th is the reason for the behavior
change. I don't have a solution yet other than backing out the changes.
I'm still trying to understand what you're doing in the
single_pass_render function before coming up with a solution.
I think this problem was mentioned in an earlier thread around May. See
http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/2
008-May/011595.html.
To see the problem look at SmokeBox.osg with osgviewer (I'm using osg
2.6.0). The particles are rotating about the wrong axis (or at least a
different axis).
----
Tom Jolley
________________________________
From: Jolley, Thomas P
Sent: Thursday, August 21, 2008 2:11 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Particle system
setInitialRotationalSpeedRange()
Hi Erik,
I noticed the same thing about a week ago while upgrading an
application from osg 1.0 to 2.4. It was on my list of things to look
into.
________________________________
From: Erik Johnson [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 21, 2008 10:30 AM
To: [email protected]
Subject: Re: [osg-users] Particle system
setInitialRotationalSpeedRange()
There is certainly a change in behavior, although I
can't pinpoint the change in code yet.
Setting the rotational speed with (0, 0, 1):
OSG 2.2.0 - particles rotate like fans (pinwheels)
OSG 2.4.0 - particles rotate like a margarita blender
(cork-screw)
OSG 2.6.0 - particles rotate like a margarita blender
(cork-screw)
I guess I'm just wondering if this is the expected
behavior? And I'm surprised nobody has a problem with this.
Thanks,
Erik
Date: Thu, 21 Aug 2008 09:26:52 +0100
From: "Robert Osfield"
<[EMAIL PROTECTED]>
Subject: Re: [osg-users] Particle system
setInitialRotationalSpeedRange()
To: "OpenSceneGraph Users"
<[email protected]>
Message-ID:
<[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1
Hi Erik,
osgParticle has hardly been touched between
OSG-2.2 and 2.6. Use svn
log to check which files have changed.
Robert.
On Thu, Aug 21, 2008 at 1:07 AM, Erik Johnson
<[EMAIL PROTECTED]> wrote:
> Hi all,
>
> It seems to me, back in the OSG 2.2.x time
frame, that I could set the
> initial rotational velocity of the
RadialShooter and have the particles
> "pinwheel" around their center point, while
maintaining their billboard
> orientation and face the Camera. Perhaps it
was a rotation on the "Y"
> axis.
>
> Nowadays with OSG 2.4/2.6, setting the
rotational speed will cause the
> particles to rotate relative to the world axis
and not in the
> camera-relative axis.
>
> Is this a bug? A feature? Is it still posible
to "pinwheel" a particle
> around? Does anyone use
setInitialRotationalSpeedRange()?
>
> This was a cool effect which added a nice
dimension to smoke plumes and
> such.
>
> Thanks for any info!
> -Erik Johnson
>
>
>
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> osg-users mailing list
> [email protected]
>
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g
>
>
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