Re: [osg-users] Particle system setInitialRotationalSpeedRange()

2008-12-18 Thread Robert Osfield 
Hi Erik et. al,

I have now fixed osgParticle to behave as it did before w.r.t particle
rotation.  The fix is now checked in to svn/trunk.

I reviewed the changes from Tom, but these would have broken other
functionality so I re-factored ParticleSystem::single_pass_render()
and Particle::render() methods so that the rotation implementation
moved out of the lower level Particle::render() into the
single_pass_render() function.  With this change I also made the
rotation so that it was done in eye coordinates, and made the rotation
operation optional so the cost of computing the rotation matrix was
only applied to particle systems that actually needed it.  This change
should speed up particle systems that don't use rotation.

In investigating this issue I found that the concept of particle
rotation is actually broken in osgParticle, as the particle rotation
really should be done in object coordinates not in eye coordinates,
however billboard doesn't mix well with such a model without doing
something clever with projecting the rotation from local to eye
coordinates.  I will cross this bridge another day though, for now
I've implemented the original, if somewhat conceptually broken,
behviour.

Could you try out svn trunk to see if this fixes it.

Cheers,
Robert.

On Thu, Aug 21, 2008 at 12:07 AM, Erik Johnson r.erik.john...@gmail.com 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@lists.openscenegraph.org
 http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org


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Re: [osg-users] Particle system setInitialRotationalSpeedRange()

2008-12-05 Thread Michael Bach Jensen 
Hi all!

We are having this issue as well in our simulation software, since we
are also rotating our smoke particles to add a nice motion the smoke.
Any idea when it will be fixed? Or does someone know of a workaround?

Kind regards,
Michael

***

Zsa Zsa Gabor  - A man in love is incomplete until he has married.
Then he's finished.


2008/12/5 Michael Bach Jensen [EMAIL PROTECTED]:
 Hi Thom,

 Thanks for the detective work. The change you've suggested as causing
 the regression is r7961.

   http://www.openscenegraph.org/projects/osg/changeset/7961

 It's six months since I code this so it's a bit cold a topic so off
 the top of my head I can't point to anything in a particular as being
 the cause of the problems.  I will have to sit down and step through
 the code.

 Thanks for pointing out that SmokeBox.osg reproduces the problem, with
 the problem in front of me it's very difficult to spot issues in code.

 Robert.


 On Tue, Nov 11, 2008 at 11:21 PM, Jolley, Thomas P
 [EMAIL PROTECTED] wrote:
 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/2008-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 [EMAIL PROTECTED]
 Sent: Thursday, August 21, 2008 10:30 AM
 To: osg-users@lists.openscenegraph.org
 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 osg-users@lists.openscenegraph.org
 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
 
 
  ___
  osg-users mailing list
  osg-users@lists.openscenegraph.org
 
  http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
 
 



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[osg-users] Particle system setInitialRotationalSpeedRange()

2008-12-05 Thread Michael Bach Jensen 
Hi all!

Does anyone know if the bug mentioned in the following post will be
fixed or if there is a workaround?

http://www.mail-archive.com/osg-users@lists.openscenegraph.org/msg18069.html

We use it, like Erik Johnson mentioned, to create a nice motion to
smoke effects.

/Michael

***

Steve Martin  - I've got to keep breathing. It'll be my worst
business mistake if I don't.
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Re: [osg-users] Particle system setInitialRotationalSpeedRange()

2008-12-05 Thread Jolley, Thomas P 
Hi Michael,

You can try one of the following:
1. Fix the problem in ParticleSystem.cpp and submit it to Robert.
2. Backout the 7961 changes to ParticleSystem.cpp.
3. Change the particle rotation axis so particles rotate about the Y
axis instead of the Z axis.

Number 3 is probably not the best as you will need to change it again
once the problem is fixed.


 -Original Message-
 From: Michael Bach Jensen [mailto:[EMAIL PROTECTED] 
 Sent: Friday, December 05, 2008 4:44 AM
 To: osg-users@lists.openscenegraph.org
 Subject: Re: [osg-users] Particle system 
 setInitialRotationalSpeedRange()
 
 Hi all!
 
 We are having this issue as well in our simulation software, 
 since we are also rotating our smoke particles to add a nice 
 motion the smoke.
 Any idea when it will be fixed? Or does someone know of a workaround?
 
 Kind regards,
 Michael
 
 ***
 
 Zsa Zsa Gabor  - A man in love is incomplete until he has married.
 Then he's finished.
 
 
 2008/12/5 Michael Bach Jensen [EMAIL PROTECTED]:
  Hi Thom,
 
  Thanks for the detective work. The change you've suggested 
 as causing 
  the regression is r7961.
 
http://www.openscenegraph.org/projects/osg/changeset/7961
 
  It's six months since I code this so it's a bit cold a topic so off 
  the top of my head I can't point to anything in a 
 particular as being 
  the cause of the problems.  I will have to sit down and 
 step through 
  the code.
 
  Thanks for pointing out that SmokeBox.osg reproduces the 
 problem, with 
  the problem in front of me it's very difficult to spot 
 issues in code.
 
  Robert.
 
 
  On Tue, Nov 11, 2008 at 11:21 PM, Jolley, Thomas P [EMAIL 
 PROTECTED] 
  wrote:
  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-opensceneg
 raph.org/2008-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 [EMAIL PROTECTED]
  Sent: Thursday, August 21, 2008 10:30 AM
  To: osg-users@lists.openscenegraph.org
  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 osg-users@lists.openscenegraph.org
  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
  
  
   ___
   osg-users mailing list
   osg-users@lists.openscenegraph.org
  
   
 http://lists.openscenegraph.org/listinfo.cgi/osg

Re: [osg-users] Particle system setInitialRotationalSpeedRange()

2008-11-12 Thread Robert Osfield 
Hi Thom,

Thanks for the detective work. The change you've suggested as causing
the regression is r7961.

   http://www.openscenegraph.org/projects/osg/changeset/7961

It's six months since I code this so it's a bit cold a topic so off
the top of my head I can't point to anything in a particular as being
the cause of the problems.  I will have to sit down and step through
the code.

Thanks for pointing out that SmokeBox.osg reproduces the problem, with
the problem in front of me it's very difficult to spot issues in code.

Robert.


On Tue, Nov 11, 2008 at 11:21 PM, Jolley, Thomas P
[EMAIL PROTECTED] wrote:
 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/2008-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: osg-users@lists.openscenegraph.org
 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 osg-users@lists.openscenegraph.org
 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
 
 
  ___
  osg-users mailing list
  osg-users@lists.openscenegraph.org
 
  http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
 
 



 ___
 osg-users mailing list
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 http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org


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Re: [osg-users] Particle system setInitialRotationalSpeedRange()

2008-11-11 Thread Jolley, Thomas P 
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: osg-users@lists.openscenegraph.org
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
osg-users@lists.openscenegraph.org
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



___
 osg-users mailing list
 osg-users@lists.openscenegraph.org

http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or
g






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osg-users@lists.openscenegraph.org
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Re: [osg-users] Particle system setInitialRotationalSpeedRange()

2008-08-21 Thread Robert Osfield 
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


 ___
 osg-users mailing list
 osg-users@lists.openscenegraph.org
 http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org


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osg-users@lists.openscenegraph.org
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Re: [osg-users] Particle system setInitialRotationalSpeedRange()

2008-08-21 Thread Erik Johnson 
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 osg-users@lists.openscenegraph.org
 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
 
 
  ___
  osg-users mailing list
  osg-users@lists.openscenegraph.org
 
 http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
 
 


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Re: [osg-users] Particle system setInitialRotationalSpeedRange()

2008-08-21 Thread Jolley, Thomas P 
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: osg-users@lists.openscenegraph.org
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
osg-users@lists.openscenegraph.org
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


 ___
 osg-users mailing list
 osg-users@lists.openscenegraph.org

http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or
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[osg-users] Particle system setInitialRotationalSpeedRange()

2008-08-20 Thread Erik Johnson 
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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