Re: [osg-users] osgPPU and osgShadow::MinimalShadowMap

[Serge Lages]

Thanks Wojciech,

Currently we're only trying to make it work on NVidia cards (under Windows
7), but you're right that shadows seems to have problems with latest ATI
drivers, I've recently tested one of our application on a ATI and I saw some
strange artifacts.

Cheers,

On Tue, Jul 6, 2010 at 9:38 PM, Wojciech Lewandowski
wrote:

>  Hi Serge,
>
> I am sorry I have no experience with osgPPU. Long ago (2 years ?) we tried
> it  with HDR and it seemed to work with LispSM shadows on our testbed. Have
> not tested since then. I could not help you at the moment, I am on vacations
> and my computer is a netbook. Send me a private email next week if you still
> have a problem, I will try to test it...
>
> Wojtek Lewandowski.
>
> PS. Do you by an chance test on ATI ? All techniques stemming from
> StandardShadowMap do not look good on latest Windows Catalyst drivers due to
> ATI VertexShader bugs (I can prove it).
>
>
>  *From:* Serge Lages 
> *Sent:* Tuesday, July 06, 2010 7:37 PM
> *To:* OpenSceneGraph Users 
> *Subject:* [osg-users] osgPPU and osgShadow::MinimalShadowMap
>
> Hi all,
>
> I am currently having troubles trying to make work osgPPU and specially HDR
> with osgShadow::MinimalShadowMap, you can find my test program attached (it
> comes from the list archive, I've made small modifications). Without
> shadows, it works fine, with MinimalShadowMap, I only have a black model (I
> am using cow.osg, with the teapot I have a white screen). Here is my command
> line :
>  osgppu_viewer.exe Data\hdr.ppu Data\cow.osg
>
> Any idea where it comes from ?
> Thanks !
>
> --
> Serge Lages
> http://www.tharsis-software.com
>
> --
>
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Re: [osg-users] nofity in two files from two differents applications

[David Callu]

Hi Vincent

osg::nofify is a simple log system with only one logger. So you can't expect
have many logger or one logger per thread.



To do this, you need a strongest log library like
log4cpp,
or the
incoming Boost.Log .

HTH
David Callu

2010/7/6 Vincent Bourdier 

> Hi all,
>
> I'm using the osg::notify logs, but in two applications(threads) in the
> same process.
> Each application uses the notify logs of osg that are redirected into a log
> file, but when one application run and the second is started, it redirect
> each logs into a new common file...
> I would like to keep each log into a separate file, but keeping the
> osg::notify usage.
>
> Do you have any idea or suggestion ?
>
> Thanks
>
> Regards,
>   Vincent.
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Re: [osg-users] How to make sure that both the back and the frontside of a polygon are lit...

[Alberto Luaces]

Jason Daly writes:

> Alberto Luaces wrote:
>
> If I reverse the normals the opposite side lights up as expected .. Am I 
> doing something wrong..
>

Just a clarification: I didn't wrote this, it was Sunil :)

Good point, Jason. I didn't thought about the case in that OP's light
could not be facing the surface he wanted to see...

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Re: [osg-users] FBX reading of GL_POLYGON

[Sukender]

Oh, right, sorry I didn't spot this. Thanks.

Sukender
PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/

- "Michael Platings"  a écrit :

> I was referring to that by "For quads I imagine it would be possible
> to write some fast specialised code to see if they should be split
> across vertices (0,2) or (1,3) so that loading times remain bearable."
> 
> 
> On 6 July 2010 09:02, Sukender < suky0...@free.fr > wrote:
> 
> 
> Oh... What about concave "quads" (I mean 4 points polygons)?
> 
> 
> Sukender
> PVLE - Lightweight cross-platform game engine -
> http://pvle.sourceforge.net/
> 
> - "Sukender" < suky0...@free.fr > a écrit :
> 
> 
> 
> 
> > OK. If you got time for this before I do... :)
> >
> > Sukender
> > PVLE - Lightweight cross-platform game engine -
> > http://pvle.sourceforge.net/
> >
> > - "Michael Platings" < mplati...@gmail.com > a écrit :
> >
> > > Waht you could do is leave all the triangles and quads in one
> > > PrimitiveSet (like it is already), but put each polygon with >=5
> > > vertices in it's own PrimitiveSet with Mode=POLYGON. Then run the
> > > Tesselator on the Geometry which should tesselate the polygons
> > > automagically.
> > >
> > >
> > > On 5 July 2010 13:49, Sukender < suky0...@free.fr > wrote:
> > >
> > >
> > > Hi Michael,
> > >
> > > Yes, sorry about OpenGL interpretation of polygons, I forgot that.
> > >
> > > Well actually, I guess the reader has to handle most (all?) cases.
> > So
> > > I suggest to have something like:
> > > - If number of points <= 4, use current code.
> > > - Else call GLU tesselation.
> > >
> > > Do you agree?
> > > The problem I have is that osgUtil::Tessellator is intended to
> > operate
> > > on osg's structures. Any idea on how to make it work easily in the
> > > reader plugin?
> > >
> > >
> > > Sukender
> > > PVLE - Lightweight cross-platform game engine -
> > > http://pvle.sourceforge.net/
> > >
> > > - "Michael Platings" < mplati...@gmail.com > a écrit :
> > >
> > >
> > >
> > >
> > > > No, 1 to 1 mapping of primitives isn't possible because OpenGL
> > > doesn't
> > > > render concave polygons correctly (in practice GL_POLYGON is the
> > > same
> > > > as GL_TRIANGLE_FAN).
> > > > Tesselation is possible via GLU but very slow so we need to be
> > > careful
> > > > about how we use that. Most models I've come across have many
> > > > triangles and quads but few polygons >=5 vertices. If we apply
> > > > triangulation to those few polygons then most models will be
> > > > unaffected. For quads I imagine it would be possible to write
> some
> > > > fast specialised code to see if they should be split across
> > vertices
> > > > (0,2) or (1,3) so that loading times remain bearable.
> > > > However, if your content provider could just produce models that
> > are
> > > > already suitable for real-time rendering that would be best ;)
> > > >
> > > >
> > > > On 5 July 2010 09:09, Sukender < suky0...@free.fr > wrote:
> > > >
> > > >
> > > > Hi all,
> > > >
> > > > The FBX reader seems to interpret FBX polygons as triangles.
> Well
> > I
> > > > guess this should not be, as 1-to-1 mapping of primitives is
> > > possible
> > > > (as far as I know), but this is not really an issue. What is an
> > > issue
> > > > is that concave polygons are not intepreted the right way. I
> think
> > > > about two solutions:
> > > > 1. Use tessellation code to get correct "splitting"
> > > > 2. Do the 1-to-1 mapping of primitives
> > > >
> > > > Am I right ?
> > > > Other ideas?
> > > > Anyone having time for this?
> > > >
> > > > Thanks folks!
> > > >
> > > > Cheers,
> > > >
> > > > Sukender
> > > > PVLE - Lightweight cross-platform game engine -
> > > > http://pvle.sourceforge.net/
> > > > ___
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> > > >
> > >
> >
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> > > >
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> > > >
> > >
> >
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[osg-users] Intersection with a boundingBox

[Baptiste Souli]

Hello,

I have a scene  and i would like to clip considering a bounding box (i.e
cut the polygon at the border and eliminate the outside elements). 
Does there already exist in osg an implementation to calculate the 
interesection with a boudingbox (or a plane) or must I implement it? 
I have found PolytopeIntersector but I don't know if it calculate the 
intersection or just return the vertex in the boundingbox).

Thanks.
Aerkis.

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Re: [osg-users] PageLOD externals

[Robert Osfield]

Hi Sebastian,

On Tue, Jul 6, 2010 at 9:28 PM, Sebastian Messerschmidt
 wrote:
> But there should be no principal problem including PagedLOD nodes as childs
> of PagedLODs, right?

There shouldn't be a problem.  I doubt that such a scene graph will be
ideally balanced for paging, as paging really should be based on a
LOD'd quad tree hierarchy where the different branches are well
balanced in terms of geometry and texture complexity.

> The point is all source files are located in the same source in the same
> path and the external references are loaded if the sub-tile is loaded
> individually. But anyways, I'll go on and see what the parser is trying to
> pull.

I'm afraid only you will be able to debug this as your the only one
with the data and the application you are working with.

Robert.
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Re: [osg-users] Usage of the command line of osgTerrain

[Robert Osfield]

Hi Ting,

On Tue, Jul 6, 2010 at 10:37 PM, ting zhang  wrote:
>    Thank you very much. But I heard that the osgTerrain OSG example in osg 
> 2.8.0 or even higher version has some features about the real-time generation 
> of terrains. Is this true or not? thank you again.

It all depends upon what you mean by "real-time generation of
terrains" as this is so open ended it could mean many different
things.  osgTerrain builds it's geometry and state it uses for
rendering from height fields and imagery, this is all done
automatically for you.  You can also control various parameters like
sample density and vertical exaggeration at runtime via the
osgTerrain::Terrain control node.

osgTerrain also works well with paged databases, either ones that are
created offline by the likes of VirtualPlanetBuilder, or on the fly by
3rd party NodeKits like osgEarth.

Whether this answers your question I have no idea.

Robert.
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Re: [osg-users] nofity in two files from two differents applications

[Robert Osfield]

Hi Vincent,

As David says osg::Notify is relatively simple and not designed to
handling multiple threads logging to different outputs.  You
potentially you write custom NotifyHandler (available in svn/trunk and
the 2.9.x series)  that checks the current thread using
OpenThreads::Thread::CurrentThread() and then redirect to the
appropriate user logging file.

Robert.

On Tue, Jul 6, 2010 at 10:02 PM, Vincent Bourdier
 wrote:
> Hi all,
>
> I'm using the osg::notify logs, but in two applications(threads) in the same
> process.
> Each application uses the notify logs of osg that are redirected into a log
> file, but when one application run and the second is started, it redirect
> each logs into a new common file...
> I would like to keep each log into a separate file, but keeping the
> osg::notify usage.
>
> Do you have any idea or suggestion ?
>
> Thanks
>
> Regards,
>   Vincent.
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Re: [osg-users] Intersection with a boundingBox

[Robert Osfield]

Hi Aerkis,

There is a osgUtil::PlaneIntersector that gives you the intersection
polygon between a plane and a scene, there is also the
PolytopIntersector but this tells you whether the scene contains any
geometry that has at least part of it in the polytop - it doesn't give
the intersection.

However, given your email I'm not sure either of these is what you are
after, and if you actually want to cut the polygons and create a whole
new geometry from the result then the OSG doesn't support this.
However, if you just want to do this for rendering then there is
OpenGL support for clip planes in the OSG so perhaps this is
sufficient.

Might I suggest explaining what you are after as a result rather than
focusing too much on the low level as doing so doesn't give us an idea
of what you are trying to do and why - advice for you will be much
more useful if you can provide a clearer to others.

Robert.

On Wed, Jul 7, 2010 at 9:14 AM, Baptiste Souli  wrote:
> Hello,
>
> I have a scene  and i would like to clip considering a bounding box (i.e
> cut the polygon at the border and eliminate the outside elements).
> Does there already exist in osg an implementation to calculate the 
> interesection with a boudingbox (or a plane) or must I implement it?
> I have found PolytopeIntersector but I don't know if it calculate the 
> intersection or just return the vertex in the boundingbox).
>
> Thanks.
> Aerkis.
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=29772#29772
>
>
>
>
>
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Re: [osg-users] Intersection with a boundingBox

[Riccardo Corsi]

Hi Aerkis,

all the intersection routines you find under osgUtil are meant just to
find intersection (picking being the most common usage), not to clip
polygons.
For that purpose you should instead look at osg::ClipPlane/ClipNode
which implement GL clipping.

I don't think there's a routine which clips by a bb extents, you
should implement that by using 6 different clipping planes yourself.
See osgClip example for a reference.

HTH,
Ricky

On Wed, Jul 7, 2010 at 10:14, Baptiste Souli  wrote:
> Hello,
>
> I have a scene  and i would like to clip considering a bounding box (i.e
> cut the polygon at the border and eliminate the outside elements).
> Does there already exist in osg an implementation to calculate the 
> interesection with a boudingbox (or a plane) or must I implement it?
> I have found PolytopeIntersector but I don't know if it calculate the 
> intersection or just return the vertex in the boundingbox).
>
> Thanks.
> Aerkis.
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=29772#29772
>
>
>
>
>
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Re: [osg-users] 3D terrain navigation query

[Sanat Talmaki]

Hi,

I looed the the tutorial on Billboards intersection in the tutorials section 
and that was really helpful in getting me along my way. 
http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials/Intersections

Thanks for the help to everyone.

Sanat.

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[osg-users] Human 3d model animation/motion

[Sanat Talmaki]

Hi,

I am trying to create a scene in which I want to add 3d models of humans and 
control their motion through keyboard and/or automated.

However I am having trouble starting off as I'm not sure what exactly to do. 
This is what I've done so far:

1) I looked at the DOF node and tutorial and figured that I would need a human 
model with DOF nodes at the hands and legs linkages. I looked at 
http://www.makehuman.org/ but was not sure if this was the way to go to obtain 
3d human models with DOF nodes in them.

2) So far the models of other vehiclces I'm using in my scene are composed of a 
number of .lwo files that I link using PAT nodes and can move each part 
individually. But I believe that with models having DOF nodes, I would get a 
single file but with those nodes specified in them. Is my understanding correct 
?

3) I tried to convert a .flt model to .osg from the tutorials dataset using 
osgconv but got this message:

C:\tools\OpenSceneGraph-2.8.2_Release\bin>osgconv.exe  C:\Users\Sanat\Desktop\CE
M_Res_Software\OSG Code\NPS_Tutorials_src\NPS_Data\Models\t72-tank\t72-tank_des.
flt C:\Users\Sanat\Desktop\CEM_Res_Software\OSG Code\NPS_Tutorials_src\NPS_Data\
Models\t72-tank\tank.osg
Warning: Could not find plugin to read objects from file "C:\Users\Sanat\Desktop
\CEM_Res_Software\OSG".
Error no data loaded.


So I was hoping to get some pointers as to how I can proceed ? (I have my 3d 
scene ready but just finding it hard to figure out how to get a human model to 
move)

Thanks

Regards,
Sanat

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Re: [osg-users] FBX reading of GL_POLYGON

[Sukender]

Alright. I started working on it.

Sukender
PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/

- "Sukender"  a écrit :

> Oh, right, sorry I didn't spot this. Thanks.
> 
> Sukender
> PVLE - Lightweight cross-platform game engine -
> http://pvle.sourceforge.net/
> 
> - "Michael Platings"  a écrit :
> 
> > I was referring to that by "For quads I imagine it would be possible
> > to write some fast specialised code to see if they should be split
> > across vertices (0,2) or (1,3) so that loading times remain
> bearable."
> >
> >
> > On 6 July 2010 09:02, Sukender < suky0...@free.fr > wrote:
> >
> >
> > Oh... What about concave "quads" (I mean 4 points polygons)?
> >
> >
> > Sukender
> > PVLE - Lightweight cross-platform game engine -
> > http://pvle.sourceforge.net/
> >
> > - "Sukender" < suky0...@free.fr > a écrit :
> >
> >
> >
> >
> > > OK. If you got time for this before I do... :)
> > >
> > > Sukender
> > > PVLE - Lightweight cross-platform game engine -
> > > http://pvle.sourceforge.net/
> > >
> > > - "Michael Platings" < mplati...@gmail.com > a écrit :
> > >
> > > > Waht you could do is leave all the triangles and quads in one
> > > > PrimitiveSet (like it is already), but put each polygon with >=5
> > > > vertices in it's own PrimitiveSet with Mode=POLYGON. Then run
> the
> > > > Tesselator on the Geometry which should tesselate the polygons
> > > > automagically.
> > > >
> > > >
> > > > On 5 July 2010 13:49, Sukender < suky0...@free.fr > wrote:
> > > >
> > > >
> > > > Hi Michael,
> > > >
> > > > Yes, sorry about OpenGL interpretation of polygons, I forgot
> that.
> > > >
> > > > Well actually, I guess the reader has to handle most (all?)
> cases.
> > > So
> > > > I suggest to have something like:
> > > > - If number of points <= 4, use current code.
> > > > - Else call GLU tesselation.
> > > >
> > > > Do you agree?
> > > > The problem I have is that osgUtil::Tessellator is intended to
> > > operate
> > > > on osg's structures. Any idea on how to make it work easily in
> the
> > > > reader plugin?
> > > >
> > > >
> > > > Sukender
> > > > PVLE - Lightweight cross-platform game engine -
> > > > http://pvle.sourceforge.net/
> > > >
> > > > - "Michael Platings" < mplati...@gmail.com > a écrit :
> > > >
> > > >
> > > >
> > > >
> > > > > No, 1 to 1 mapping of primitives isn't possible because OpenGL
> > > > doesn't
> > > > > render concave polygons correctly (in practice GL_POLYGON is
> the
> > > > same
> > > > > as GL_TRIANGLE_FAN).
> > > > > Tesselation is possible via GLU but very slow so we need to be
> > > > careful
> > > > > about how we use that. Most models I've come across have many
> > > > > triangles and quads but few polygons >=5 vertices. If we apply
> > > > > triangulation to those few polygons then most models will be
> > > > > unaffected. For quads I imagine it would be possible to write
> > some
> > > > > fast specialised code to see if they should be split across
> > > vertices
> > > > > (0,2) or (1,3) so that loading times remain bearable.
> > > > > However, if your content provider could just produce models
> that
> > > are
> > > > > already suitable for real-time rendering that would be best ;)
> > > > >
> > > > >
> > > > > On 5 July 2010 09:09, Sukender < suky0...@free.fr > wrote:
> > > > >
> > > > >
> > > > > Hi all,
> > > > >
> > > > > The FBX reader seems to interpret FBX polygons as triangles.
> > Well
> > > I
> > > > > guess this should not be, as 1-to-1 mapping of primitives is
> > > > possible
> > > > > (as far as I know), but this is not really an issue. What is
> an
> > > > issue
> > > > > is that concave polygons are not intepreted the right way. I
> > think
> > > > > about two solutions:
> > > > > 1. Use tessellation code to get correct "splitting"
> > > > > 2. Do the 1-to-1 mapping of primitives
> > > > >
> > > > > Am I right ?
> > > > > Other ideas?
> > > > > Anyone having time for this?
> > > > >
> > > > > Thanks folks!
> > > > >
> > > > > Cheers,
> > > > >
> > > > > Sukender
> > > > > PVLE - Lightweight cross-platform game engine -
> > > > > http://pvle.sourceforge.net/
> > > > > ___
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> > > > >
> > > >
> > >
> >
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> > > > >
> > > > >
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> > >
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Re: [osg-users] Human 3d model animation/motion

[Martin Scheffler]

Hi nerazzuri,

You can check out Delta3D (www.delta3d.org).
It is a game engine based on OSG that has a lot of functionality for
controlling animated persons. The animations use the Cal3D format btw.
In the examples/ folder of the delta3d distro there are some examples on how to 
create and control animations.

Thank you!

Cheers,
Martin

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Re: [osg-users] automatically minimize the viewer window

[Trajce (Nick) Nikolov]

are you under windows? If so there is a way to do that by setting a new
style with WS_MINIMIZE

http://msdn.microsoft.com/en-us/library/ms633591(VS.85).aspx


-Nick


On Wed, Jul 7, 2010 at 3:45 AM, Thomas Canipel wrote:

> Hi,
>
> Is there a way to modify the behavior of the window, like minimize it ,
> programmatically ?
>
>
> Thank you!
>
> Cheers,
> Thomas
>
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Re: [osg-users] osgviewerd cow.osg ---no data loaded

[Jean-Sébastien Guay]

Hi Randy,


Thanks for your explicit response!
Yes, I've solved this problem and the cow could appear.
But another question now:
The command line shows an error after "osgviewerd cow.osg": Error: [Screen #0] 
ChooseMatchingPixelFormat<>  -Unable to choose the requested pixel format
Any suggestion?
Thanks again!


Do you have OpenGL drivers installed for whatever graphics hardware your 
machine has? That should not happen for the window that osgviewer tries 
to open - it specifies a basic pixel format that should work pretty much 
everywhere.


Also - I notice you're using debug binaries, which won't be what causes 
the above problem, but for performance in the future you should also 
compile OSG in release, and generally use its own applications and 
examples in release mode, it gives a better impression of what OSG can do.


Hope this helps,

J-S
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Re: [osg-users] Human 3d model animation/motion

[Mourad Boufarguine]

Hi Sanat,

A quick answer to the 3rd point :

On Wed, Jul 7, 2010 at 2:04 PM, Sanat Talmaki wrote:

> Hi,
>
> I am trying to create a scene in which I want to add 3d models of humans
> and control their motion through keyboard and/or automated.
>
> However I am having trouble starting off as I'm not sure what exactly to
> do. This is what I've done so far:
>
> 1) I looked at the DOF node and tutorial and figured that I would need a
> human model with DOF nodes at the hands and legs linkages. I looked at
> http://www.makehuman.org/ but was not sure if this was the way to go to
> obtain 3d human models with DOF nodes in them.
>
> 2) So far the models of other vehiclces I'm using in my scene are composed
> of a number of .lwo files that I link using PAT nodes and can move each part
> individually. But I believe that with models having DOF nodes, I would get a
> single file but with those nodes specified in them. Is my understanding
> correct ?
>
> 3) I tried to convert a .flt model to .osg from the tutorials dataset using
> osgconv but got this message:
>
> C:\tools\OpenSceneGraph-2.8.2_Release\bin>osgconv.exe
>  C:\Users\Sanat\Desktop\CE
> M_Res_Software\OSG
> Code\NPS_Tutorials_src\NPS_Data\Models\t72-tank\t72-tank_des.
> flt C:\Users\Sanat\Desktop\CEM_Res_Software\OSG
> Code\NPS_Tutorials_src\NPS_Data\
> Models\t72-tank\tank.osg
> Warning: Could not find plugin to read objects from file
> "C:\Users\Sanat\Desktop
> \CEM_Res_Software\OSG".
> Error no data loaded.
>
> 
>
>
The spaces in your paths are causing the problem. try this :

osgconv.exe  "C:\Users\Sanat\Desktop\CE
M_Res_Software\OSG
Code\NPS_Tutorials_src\NPS_Data\Models\t72-tank\t72-tank_des.
flt" "C:\Users\Sanat\Desktop\CEM_Res_Software\OSG
Code\NPS_Tutorials_src\NPS_Data\
Models\t72-tank\tank.osg"


> So I was hoping to get some pointers as to how I can proceed ? (I have my
> 3d scene ready but just finding it hard to figure out how to get a human
> model to move)
>
> Thanks
>
> Regards,
> Sanat
>
>

Mourad
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Re: [osg-users] 3D Scene emulating a 2D environment

[Jean-Sébastien Guay]

Hi Theo,


I'll have a camera that will be still for the whole time. 2D objects will be 
put in front of the camera as it was a 2D application. Although, sometimes 
these 2D objects will spin around an axis in 3D. So, I cannot use the Ortho 
projection.


Why not? Your objects are still in 3D space when you use an ortho 
projection, the difference is only that objects that are farther away 
from the camera will not become smaller. If all your objects will always 
be positioned on the same plane from the camera, and you just need to be 
able to rotate them, you can still use an ortho projection.


But perhaps you want to see perspective within your objects too, in 
which case you're right, you'll have to use a perspective projection.



However, I can't find out how to set the projection matrix so that I can work 
with my coordinates right. I need to know what are the maximum coordinates that 
fit my window, how many pixels there are, what real size are the objects, 
etc... Because I'm getting some window coordinates from screen touchs! As these 
coordinates are relative to the window I don't know how to relate them to my 
OSG objects!


To transform screen position to world position, use this code:

osg::Matrix MVPW( camera->getViewMatrix() *
  camera->getProjectionMatrix() *
  camera->getViewport()->computeWindowMatrix());

osg::Matrixd inverseMVPW = osg::Matrixd::inverse(MVPW);

osg::Vec3 near_point = osg::Vec3(x,y,0.0f) * inverseMVPW;
osg::Vec3 far_point  = osg::Vec3(x,y,1.0f) * inverseMVPW;

Note that what you get is actually a line that goes from the near plane 
to the far plane, since you're transforming 2D coordinates into 3D it 
means that a point in 2D becomes a line in 3D.


To transform a 3D position into 2D window coordinates you would just do 
the opposite of that, using the same MVPW as above:


osg::Vec3 posIn2D = posIn3D * MVPW;

Just make sure the posIn3D is in world space and not in some object's 
local coordinate system.


Hope this helps,

J-S
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[osg-users] osgAnimation : keyframe osg::Switch

[Peter Wrobrl]

Hi,

i need to switch on and off objects through an animation clip. The Idea is to 
use a switch node, but there is no boolean "interpolator" type, and also no 
keyword name for this kind of channel if I'm not wrong.

More over my constraint is to use osg 2.8.3 as it is, and I need to write out 
the animation data into an osg file.

How can this be accomplished ? 

Thank you!

Cheers,
PP

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Re: [osg-users] Human 3d model animation/motion

[Jean-Sébastien Guay]

Hello Sanat,


I am trying to create a scene in which I want to add 3d models of humans and 
control their motion through keyboard and/or automated.

However I am having trouble starting off as I'm not sure what exactly to do.


You should look into osgAnimation. It is a sub-library of OSG (node kit) 
which provides animation functionality, and in particular it can animate 
skinned human meshes.


Before you can do anything with osgAnimation you need some human model 
it can work with. For this you can go two ways: either get a model that 
is rigged and animated already, or create one in a modeling tool 
(Blender is open source and can save Collada files, Softimage XSI Mod 
Tool can be used for non-commercial uses and can export Collada and FBX 
files, and then there are commercial modeling tools like XSI, Maya, 3DS 
Max etc). Then you would use one of the OSG plugins that supports 
animation to load it (the FBX and Collada plugins can load animations, 
not sure if others can too).


On the other hand, if you already have a human 3D model, you could 
either load it up in a modeling program to add bones and skinning to it, 
or do it programmatically based on any kind of transform nodes your 
model has (note that DOF nodes are not really different than other 
transform nodes (PAT, MatrixTransform, etc), the way you work with them 
is different but they're all transforms, their goal is to specify a 
local coordinate system).


Once your data can be loaded (you can use the osganimationviewer example 
to test if OSG and the plugin can load your model and animations 
correctly) you can programmatically start animations when events happen, 
such as input or some AI routines you would write.


It looks daunting, many things to do, but take it one step at a time and 
you'll get there :-)


Another thing:


3) I tried to convert a .flt model to .osg from the tutorials dataset using 
osgconv but got this message:

C:\tools\OpenSceneGraph-2.8.2_Release\bin>osgconv.exe  C:\Users\Sanat\Desktop\CE
M_Res_Software\OSG Code\NPS_Tutorials_src\NPS_Data\Models\t72-tank\t72-tank_des.
flt C:\Users\Sanat\Desktop\CEM_Res_Software\OSG Code\NPS_Tutorials_src\NPS_Data\
Models\t72-tank\tank.osg
Warning: Could not find plugin to read objects from file "C:\Users\Sanat\Desktop
\CEM_Res_Software\OSG".
Error no data loaded.



As klortho would say: "Look at the error message" (though he'd be less 
polite about it, and would probably type it in all caps because he yells 
a lot). You can see that OSG tried to load


  C:\Users\Sanat\Desktop\CEM_Res_Software\OSG

and not

  C:\Users\Sanat\Desktop\CEM_Res_Software\OSG 
Code\NPS_Tutorials_src\NPS_Data\Models\t72-tank\t72-tank_des.flt


which is the path you specified. It stopped at the space character... 
You need to quote the path so that the Windows command line interpreter 
doesn't cut your path at spaces. Try this:


  osgconv.exe "C:\Users\Sanat\Desktop\CEM_Res_Software\OSG 
Code\NPS_Tutorials_src\NPS_Data\Models\t72-tank\t72-tank_des.flt" 
"C:\Users\Sanat\Desktop\CEM_Res_Software\OSG 
Code\NPS_Tutorials_src\NPS_Data\Models\t72-tank\tank.osg"


That should give you an .osg file.

Hope this helps,

J-S
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[osg-users] cull callbacks

[Andy Skinner]

What is the difference between the cull callback set on a Drawable and a 
NodeCallback set as a cull callback on a Node?

I saw one thread on the list where someone was confusing them, and the 
difference was mentioned, but not spelled out.  It appears the 
Drawable::CullCallback is used to decide whether to cull the drawable.  What 
does the cull callback on the Node do?

thanks
andy

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Re: [osg-users] FBX reading of GL_POLYGON

[Sukender]

Hi Michael,

I managed to write the code, but I need testing. Moreover I can't update the 
FBX plugin because of the regression I told you in another thread, concerning 
images.
Can you, please:
- Merge changes to your working copy, and
- Make a few tests with your models?

Also feel free to commit if everything seems okay.
Attached file is against rev. 11322 of the trunk.

Many thanks.

For info, my implemtation looks like:
- Add points of the triangles
- Detect how to split quads (02 or 13), and add points for the two triangles
- Save polygons in a temporary array
- Add a primitive set for all triangles (DrawArray)
- Add polygons points AFTER the points of the triangles
- Add primitive sets for polygons
- Tessellate

Sukender
PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/

- "Sukender"  a écrit :

> Alright. I started working on it.
> 
> Sukender
> PVLE - Lightweight cross-platform game engine -
> http://pvle.sourceforge.net/
> 
> - "Sukender"  a écrit :
> 
> > Oh, right, sorry I didn't spot this. Thanks.
> >
> > Sukender
> > PVLE - Lightweight cross-platform game engine -
> > http://pvle.sourceforge.net/
> >
> > - "Michael Platings"  a écrit :
> >
> > > I was referring to that by "For quads I imagine it would be
> possible
> > > to write some fast specialised code to see if they should be split
> > > across vertices (0,2) or (1,3) so that loading times remain
> > bearable."
> > >
> > >
> > > On 6 July 2010 09:02, Sukender < suky0...@free.fr > wrote:
> > >
> > >
> > > Oh... What about concave "quads" (I mean 4 points polygons)?
> > >
> > >
> > > Sukender
> > > PVLE - Lightweight cross-platform game engine -
> > > http://pvle.sourceforge.net/
> > >
> > > - "Sukender" < suky0...@free.fr > a écrit :
> > >
> > >
> > >
> > >
> > > > OK. If you got time for this before I do... :)
> > > >
> > > > Sukender
> > > > PVLE - Lightweight cross-platform game engine -
> > > > http://pvle.sourceforge.net/
> > > >
> > > > - "Michael Platings" < mplati...@gmail.com > a écrit :
> > > >
> > > > > Waht you could do is leave all the triangles and quads in one
> > > > > PrimitiveSet (like it is already), but put each polygon with
> >=5
> > > > > vertices in it's own PrimitiveSet with Mode=POLYGON. Then run
> > the
> > > > > Tesselator on the Geometry which should tesselate the polygons
> > > > > automagically.
> > > > >
> > > > >
> > > > > On 5 July 2010 13:49, Sukender < suky0...@free.fr > wrote:
> > > > >
> > > > >
> > > > > Hi Michael,
> > > > >
> > > > > Yes, sorry about OpenGL interpretation of polygons, I forgot
> > that.
> > > > >
> > > > > Well actually, I guess the reader has to handle most (all?)
> > cases.
> > > > So
> > > > > I suggest to have something like:
> > > > > - If number of points <= 4, use current code.
> > > > > - Else call GLU tesselation.
> > > > >
> > > > > Do you agree?
> > > > > The problem I have is that osgUtil::Tessellator is intended to
> > > > operate
> > > > > on osg's structures. Any idea on how to make it work easily in
> > the
> > > > > reader plugin?
> > > > >
> > > > >
> > > > > Sukender
> > > > > PVLE - Lightweight cross-platform game engine -
> > > > > http://pvle.sourceforge.net/
> > > > >
> > > > > - "Michael Platings" < mplati...@gmail.com > a écrit :
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > > No, 1 to 1 mapping of primitives isn't possible because
> OpenGL
> > > > > doesn't
> > > > > > render concave polygons correctly (in practice GL_POLYGON is
> > the
> > > > > same
> > > > > > as GL_TRIANGLE_FAN).
> > > > > > Tesselation is possible via GLU but very slow so we need to
> be
> > > > > careful
> > > > > > about how we use that. Most models I've come across have
> many
> > > > > > triangles and quads but few polygons >=5 vertices. If we
> apply
> > > > > > triangulation to those few polygons then most models will be
> > > > > > unaffected. For quads I imagine it would be possible to
> write
> > > some
> > > > > > fast specialised code to see if they should be split across
> > > > vertices
> > > > > > (0,2) or (1,3) so that loading times remain bearable.
> > > > > > However, if your content provider could just produce models
> > that
> > > > are
> > > > > > already suitable for real-time rendering that would be best
> ;)
> > > > > >
> > > > > >
> > > > > > On 5 July 2010 09:09, Sukender < suky0...@free.fr > wrote:
> > > > > >
> > > > > >
> > > > > > Hi all,
> > > > > >
> > > > > > The FBX reader seems to interpret FBX polygons as triangles.
> > > Well
> > > > I
> > > > > > guess this should not be, as 1-to-1 mapping of primitives is
> > > > > possible
> > > > > > (as far as I know), but this is not really an issue. What is
> > an
> > > > > issue
> > > > > > is that concave polygons are not intepreted the right way. I
> > > think
> > > > > > about two solutions:
> > > > > > 1. Use tessellation code to get correct "splitting"
> > > > > > 2. Do the 1-to-1 mapping of primitives
> > > > > >
> > > > > > Am I right ?
> > > > > >

[osg-users] [vpb] .tif and .tfw

[lucie lemonnier]

Hi,

I have a file of elevation data DTED and an orthoimage .tif with a .tfw file. A 
.tfw file is used to georeference a .tif file. When I use "osgdem -d data.dt1 
-l 3 -o data.osg", I get a terrain model without texture and when I use "osgdem 
-d data.dt1 -t data.tif -l 3 -o data.osg", the projection of the orthoimage 
isn't correct. 
Does anyone know how to use .tif with .tfw with VPB?

Thank you!

Cheers,
lucie

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Re: [osg-users] cull callbacks

[Tim Moore]

On Wed, Jul 7, 2010 at 4:12 PM, Andy Skinner wrote:

> What is the difference between the cull callback set on a Drawable and a
> NodeCallback set as a cull callback on a Node?
>
> I saw one thread on the list where someone was confusing them, and the
> difference was mentioned, but not spelled out.  It appears the
> Drawable::CullCallback is used to decide whether to cull the drawable.  What
> does the cull callback on the Node do?
>
> The difference stems from the fact that a Drawable isn't a first-class
scene graph node and exists below the bottom leaves of the scene graph. a
Node cull callback is responsible for continuing the traversal by calling
traverse() on its children if they are not culled. A Drawable cull callback
returns a true or false indication whether or not the Drawable should be
culled. You can actually do more than that in a Drawable cull callback, but
you would need to get down and dirty with the internals of the CullVisitor
class.

Tim

> thanks
> andy
>
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Re: [osg-users] 3D Scene emulating a 2D environment

[Theo Ribeiro]

Hi Jean-Sebastien and Martin,
Thank you both for helping.

J-S, that's exactly it. I still want to have perspective within my objects. 

As for the coordinates, I can see where you are going but I still don't know 
how can I know the boundaries of my camera view on the xz plane. I mean, if I 
use the ortho projection I can set it and my viewport to the size of my screen 
and I'll know exactly what coordinates the boundaries of my camera will be. So 
if I draw a point to 1024,768 I'll know it will be on the corner of the screen. 
How can I do the same thing using the perspective projection?  


Thanks a lot!

Cheers,
Theo

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Re: [osg-users] Human 3d model animation/motion

[Sanat Talmaki]

Hi Martin,

Thanks for your suggestion. I took a look at its website and I have one 
question about Delta3D. I am already working with an osg application in visual 
studio. So if I decide to go the Delta3D way, can I can continue using osg 
primarily and Delta3D for just certain aspects that make it more convenient to 
use than osg ? 

I am just beginning to get friendly with the osg api and wanted to know if 
Delta 3D would once again give me a new learning curve to scale ?

Thanks

Sanat.

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Re: [osg-users] Human 3d model animation/motion

[Sanat Talmaki]

Hi Mourad ,

Yes, that helped. I have a .osg file of the tank now. Thanks for catching that 
out.  

-Sanat

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Re: [osg-users] How to make sure that both the back and thefrontside of a polygon are lit...

[Jason Daly]

Alberto Luaces wrote:


Just a clarification: I didn't wrote this, it was Sunil :)
  


Sorry, I guess I snipped carelessly  :-)

--"J"

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Re: [osg-users] Human 3d model animation/motion

[Sanat Talmaki]

Hi Jean,

As you mentioned, it is a lot of steps. But it got me thinking:
In one of the examples/tutorials, using a keyboard handler, the user can change 
which type of tank is being viewed i.e. whether a good  (intact) one or a 
destroyed (bad) one.
Using a similar mechanism, can one also use 2 states of a model- a static one 
and a rigged/walking one when the model is made to move ? 

Also, do you recommend any sources where to find 3d-models ?

Thanks,

Sanat.

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[osg-users] osganimationsolid example

[Gianni Ambrosio]

Hi All,
I tried to look at the osganimationsolid example but I'm not sure to understand 
it correctly. Is seems to me that the way a channel is conected to an animation 
is string diven.

Example (from osganimationsolid):

osgAnimation::Vec3LinearChannel* channelAnimation2 = new 
osgAnimation::Vec3LinearChannel;
channelAnimation2->setTargetName("AnimatedCallback");
channelAnimation2->setName("euler");

channelAnimation2->getOrCreateSampler()->getOrCreateKeyframeContainer()->push_back(osgAnimation::Vec3Keyframe(0,
 osg::Vec3(0,0,0)));

channelAnimation2->getOrCreateSampler()->getOrCreateKeyframeContainer()->push_back(osgAnimation::Vec3Keyframe(1.5,
 osg::Vec3(2*osg::PI,0,0)));
osgAnimation::Animation* anim2 = new osgAnimation::Animation;
anim2->addChannel(channelAnimation2);
anim2->setPlaymode(osgAnimation::Animation::LOOP); 

So the name "euler" is the only way I see that states the channel values are 
related to a rotation. Is it correct? If so, where can I find the list of all 
strings available?

Regards
Gianni

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Re: [osg-users] FBX Plugin: animation speed not as expected...

[Michael Platings]

Hi Alessandro, I can't reproduce the problem so I don't know why you're
seeing that, sorry.
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Re: [osg-users] [vpb] .tif and .tfw

[Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC]

Have you tried using the --geocentric flag? I've used .tif files before just
fine but they were georeferenced. Try running

gdalinfo data.tif

to see what projection the file is using. If it's not geocentric, you can
reproject the data by

gdalwarp -t_srs "+proj=latlong +datum=WGS84" -r bilinear data.tif data2.tif

then try using

osgdem --geocentric -d data.dt1 -t data2.tif -l 3 -o data.ive

-Shayne

-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of lucie
lemonnier
Sent: Wednesday, July 07, 2010 9:29 AM
To: osg-users@lists.openscenegraph.org
Subject: [osg-users] [vpb] .tif and .tfw

Hi,

I have a file of elevation data DTED and an orthoimage .tif with a .tfw
file. A .tfw file is used to georeference a .tif file. When I use "osgdem -d
data.dt1 -l 3 -o data.osg", I get a terrain model without texture and when I
use "osgdem -d data.dt1 -t data.tif -l 3 -o data.osg", the projection of the
orthoimage isn't correct. 
Does anyone know how to use .tif with .tfw with VPB?

Thank you!

Cheers,
lucie

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Re: [osg-users] 3D Scene emulating a 2D environment

[Jean-Sébastien Guay]

Hi Theo,


As for the coordinates, I can see where you are going but I still don't know 
how can I know the boundaries of my camera view on the xz plane. I mean, if I 
use the ortho projection I can set it and my viewport to the size of my screen 
and I'll know exactly what coordinates the boundaries of my camera will be. So 
if I draw a point to 1024,768 I'll know it will be on the corner of the screen.
How can I do the same thing using the perspective projection?


Well a rectangle in 2D space will become what's known as a frustum in 
perspective-projected 3D space, i.e. a truncated pyramid. You can simply 
unproject your viewport's 4 corners (top-left, top-right, bottom-left 
and bottom-right) to get the frustum's 8 corners, using the same math I 
posted before. As you can see, that will give you two 3D points per 2D 
point, one near and one far. You can also do the opposite.


Then given that frustum you can find out where to place your objects.

I suggest you look up 3D projection math on Google, you will get more 
details. In particular I like this page, very complete and easy to 
navigate with the bar at the top: http://www.euclideanspace.com/


Hope this helps,

J-S
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Re: [osg-users] Human 3d model animation/motion

[Jean-Sébastien Guay]

Hello Sanat,


Using a similar mechanism, can one also use 2 states of a model- a static one 
and a rigged/walking one when the model is made to move ?


Yes of course, I don't know what tutorial you're talking about but 
generally you do that with node masks or Switch nodes, and that will 
work on any type of node, whether or not the node contains animation.



Also, do you recommend any sources where to find 3d-models ?


Not really, search the web or get some contractor to make some for you...

J-S
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Re: [osg-users] Can't pick HUD geometry under perspective projection

[Don Leich]

hi all,

I found a fix for my problem.  After making only very slow progress
trying to debug actions mainly taking place in inline functions, I found
that I merely needed to open up the near and far distances in 
setProjectionMatrixAsOrtho for my HUD camera.


If anyone has advice on debugging inline functions, I'm all ears.
Thanks to those who offered up possible solutions for this problem.

-Don

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[osg-users] Convert pov into osg structures

[Domingo López Oller]

Hi, I don't know if this is possible. I have some files from GRASS with .pov 
extension and I don't know how to take them for osg.

Someone know the structure of a tga file?

For example:
An edifice:
polygon { 6, 
 <464022.599606, 907.085815 , 4087154.860413>
 <464004.190265, 907.085815 , 4087142.339932>
 <464004.190265, 937.085815 , 4087142.339932>
 <464022.599606, 937.085815 , 4087154.860413>
 <464022.599606, 907.085815 , 4087154.860413>
 <464022.599606, 907.085815 , 4087154.860413>
 
}

A river:
sphere_sweep { linear_spline 45,
 <465739.968762, 1906.192505 , 4091458.499904>, 3
 <465791.468761, 1894.422974 , 4091452.250001>, 3
 <465821.250068, 1881.933472 , 4091422.250052>, 3
 <465860.593730, 1856.298828 , 4091382.249947>, 3
 <465892.375120, 1835.943359 , 4091347.19>, 3
 <465930.218784, 1816.068726 , 4091315.500061>, 3
 <465978.812602, 1801.638184 , 4091290.250017>, 3
 <466026.968878, 1793.834595 , 4091275.750128>, 3
 <466076.624893, 1786.617188 , 4091255.249991>, 3
 <466120.343720, 1770.884644 , 4091223.750044>, 3
 <466161.875093, 1742.642090 , 4091171.500047>, 3
 <466189.468689, 1710.575928 , 4091081.000114>, 3
 <466219.343810, 1704.088501 , 4091067.499878>, 3
 <466268.312628, 1696.643555 , 4091062.999886>, 3
 <466301.593757, 1684.553589 , 4091025.499950>, 3
 <466350.250118, 1668.899048 , 4091009.249891>, 3
 <466384.499888, 1657.378906 , 4091005.71>, 3
 <466438.343697, 1631.369019 , 4091002.750074>, 3
 <466494.156318, 1608.742310 , 4090996.499913>, 3
 <466546.906142, 1593.277832 , 4090985.249932>, 3
 <466588.906329, 1576.062622 , 4090959.749975>, 3
 <466618.093736, 1551.168579 , 4090918.999872>, 3
 <466659.343666, 1524.220459 , 4090896.499910>, 3
 <466689.250059, 1511.777832 , 4090889.58>, 3
 <466738.187606, 1496.778687 , 4090879.500111>, 3
 <466778.656265, 1482.590088 , 4090853.500069>, 3
 <466812.656122, 1460.842041 , 4090812.249881>, 3
 <466858.718759, 1430.692139 , 4090788.750007>, 3
 <466883.218803, 1414.062012 , 4090769.499954>, 3
 <466930.843722, 1400.582275 , 4090747.500077>, 3
 <466986.437443, 1388.464478 , 4090744.500082>, 3
 <467017.156377, 1384.399048 , 4090743.85>, 3
 <467045.781157, 1377.151001 , 4090732.29>, 3
 <467085.218633, 1362.496216 , 4090705.75>, 3
 <467134.499907, 1343.728149 , 4090706.500060>, 3
 <467193.062609, 1319.315430 , 4090726.500113>, 3
 <467244.687435, 1301.977539 , 4090737.250008>, 3
 <467287.91, 1298.845825 , 4090758.59>, 3
 <467319.781122, 1293.567383 , 4090798.250077>, 3
 <467364.031306, 1282.700684 , 4090843.499914>, 3
 <467408.187416, 1266.867310 , 4090874.500034>, 3
 <467457.843689, 1245.734619 , 4090893.88>, 3
 <467509.187589, 1222.203979 , 4090897.749994>, 3
 <467561.56, 1193.638428 , 4090893.750087>, 3
 <467614.875125, 1189.556030 , 4090899.499905>, 3
 
}

Thanks!!

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Re: [osg-users] Convert pov into osg structures

[Gordon Tomlinson]

http://en.wikipedia.org/wiki/Truevision_TGA



__
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www.vis-sim.com
www.gordontomlinson.com
www.PhotographyByGordon.com

__

-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Domingo
López Oller
Sent: Wednesday, July 07, 2010 10:10 PM
To: osg-users@lists.openscenegraph.org
Subject: [osg-users] Convert pov into osg structures

Hi, I don't know if this is possible. I have some files from GRASS with .pov
extension and I don't know how to take them for osg.

Someone know the structure of a tga file?

For example:
An edifice:
polygon { 6, 
 <464022.599606, 907.085815 , 4087154.860413>
 <464004.190265, 907.085815 , 4087142.339932>
 <464004.190265, 937.085815 , 4087142.339932>
 <464022.599606, 937.085815 , 4087154.860413>
 <464022.599606, 907.085815 , 4087154.860413>
 <464022.599606, 907.085815 , 4087154.860413>
 
}

A river:
sphere_sweep { linear_spline 45,
 <465739.968762, 1906.192505 , 4091458.499904>, 3
 <465791.468761, 1894.422974 , 4091452.250001>, 3
 <465821.250068, 1881.933472 , 4091422.250052>, 3
 <465860.593730, 1856.298828 , 4091382.249947>, 3
 <465892.375120, 1835.943359 , 4091347.19>, 3
 <465930.218784, 1816.068726 , 4091315.500061>, 3
 <465978.812602, 1801.638184 , 4091290.250017>, 3
 <466026.968878, 1793.834595 , 4091275.750128>, 3
 <466076.624893, 1786.617188 , 4091255.249991>, 3
 <466120.343720, 1770.884644 , 4091223.750044>, 3
 <466161.875093, 1742.642090 , 4091171.500047>, 3
 <466189.468689, 1710.575928 , 4091081.000114>, 3
 <466219.343810, 1704.088501 , 4091067.499878>, 3
 <466268.312628, 1696.643555 , 4091062.999886>, 3
 <466301.593757, 1684.553589 , 4091025.499950>, 3
 <466350.250118, 1668.899048 , 4091009.249891>, 3
 <466384.499888, 1657.378906 , 4091005.71>, 3
 <466438.343697, 1631.369019 , 4091002.750074>, 3
 <466494.156318, 1608.742310 , 4090996.499913>, 3
 <466546.906142, 1593.277832 , 4090985.249932>, 3
 <466588.906329, 1576.062622 , 4090959.749975>, 3
 <466618.093736, 1551.168579 , 4090918.999872>, 3
 <466659.343666, 1524.220459 , 4090896.499910>, 3
 <466689.250059, 1511.777832 , 4090889.58>, 3
 <466738.187606, 1496.778687 , 4090879.500111>, 3
 <466778.656265, 1482.590088 , 4090853.500069>, 3
 <466812.656122, 1460.842041 , 4090812.249881>, 3
 <466858.718759, 1430.692139 , 4090788.750007>, 3
 <466883.218803, 1414.062012 , 4090769.499954>, 3
 <466930.843722, 1400.582275 , 4090747.500077>, 3
 <466986.437443, 1388.464478 , 4090744.500082>, 3
 <467017.156377, 1384.399048 , 4090743.85>, 3
 <467045.781157, 1377.151001 , 4090732.29>, 3
 <467085.218633, 1362.496216 , 4090705.75>, 3
 <467134.499907, 1343.728149 , 4090706.500060>, 3
 <467193.062609, 1319.315430 , 4090726.500113>, 3
 <467244.687435, 1301.977539 , 4090737.250008>, 3
 <467287.91, 1298.845825 , 4090758.59>, 3
 <467319.781122, 1293.567383 , 4090798.250077>, 3
 <467364.031306, 1282.700684 , 4090843.499914>, 3
 <467408.187416, 1266.867310 , 4090874.500034>, 3
 <467457.843689, 1245.734619 , 4090893.88>, 3
 <467509.187589, 1222.203979 , 4090897.749994>, 3
 <467561.56, 1193.638428 , 4090893.750087>, 3
 <467614.875125, 1189.556030 , 4090899.499905>, 3
 
}

Thanks!!

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Re: [osg-users] Windows 7 Aero Color Scheme issue

[Guy Volckaert]

I'm having the same problem on my laptop (single screen). When I launch the 
osgViewer application, the screen gets rendered for  1 frame and then the 
entire window becomes black. If I use ALT-TAB to cycle back and forth, then the 
scene gets rendered correctly. 

As you mentioned, it's very irritating. 

I was wondering if anyone looked into this since?

Cheers,
Guy

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Re: [osg-users] find coordeinates in IVE

[Tom Pearce]

Hi Bruce,

I'm doing something similar to you, where I want to be able to click in a scene 
and add objects at that point.  I do it as JS suggests, using an event adapter 
to get the mouse coordinates, a line segment intersector using Window 
coordinates, and an intersection visitor.  If you want, you can use node masks 
to determine which objects in the scene the intersector will find.  From the 
intersector you can get Vec3s of position and normal vector of the surface that 
was found.  The normal can be used to orient an object you place on terrain, 
for example.


Code:

osg::ref_ptr lsi = new 
osgUtil::LineSegmentIntersector(osgUtil::Intersector::WINDOW, ea.getX(), 
ea.getY());
osgUtil::IntersectionVisitor iv(lsi.get());
iv.setTraversalMask(MY_MASK);
_camera->accept(iv);
osg::Vec3 position, normal;
if(lsi->containsIntersections())
{
position = mlsi->getFirstIntersection().getWorldIntersectPoint();
normal = mlsi->getFirstIntersection().getWorldIntersectNormal();
}


 

Good luck getting it working!

Cheers,
Tom

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Re: [osg-users] osgviewerd cow.osg ---no data loaded

[Tom Pearce]

Hi,


> Error: [Screen #0] ChooseMatchingPixelFormat<> -Unable to choose the 
> requested pixel format 



I've had this error pop up while trying to run OSG applications on a remote 
machine via Windows remote desktop - don't know if that's what you're doing, 
but if so, it's probably where the issue is arising.

Cheers,
Tom

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Re: [osg-users] Convert pov into osg structures

[Ulrich Hertlein]

On 8/07/10 7:09 , Domingo López Oller wrote:
> Hi, I don't know if this is possible. I have some files from GRASS with .pov 
> extension
> and I don't know how to take them for osg.

The 'polygon' looks straight forward enough, but converting higher-level object 
like a
sphere swept along a spline into triangles isn't easily done.

Cheers,
/ulrich

PS: tga files are supported by OSG, but they're image files and so not directly 
related to
pov.

> For example:
> An edifice:
> polygon { 6, 
>  <464022.599606, 907.085815 , 4087154.860413>
>  <464004.190265, 907.085815 , 4087142.339932>
>  <464004.190265, 937.085815 , 4087142.339932>
>  <464022.599606, 937.085815 , 4087154.860413>
>  <464022.599606, 907.085815 , 4087154.860413>
>  <464022.599606, 907.085815 , 4087154.860413>
> }
> 
> A river:
> sphere_sweep { linear_spline 45,
>  <465739.968762, 1906.192505 , 4091458.499904>, 3
>  <465791.468761, 1894.422974 , 4091452.250001>, 3
>  <465821.250068, 1881.933472 , 4091422.250052>, 3
>  <465860.593730, 1856.298828 , 4091382.249947>, 3
>  <465892.375120, 1835.943359 , 4091347.19>, 3
>...
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Re: [osg-users] 3D Scene emulating a 2D environment

[Theo Ribeiro]

Hi J-S,

Now I see what you mean by world coordinates and your calculations! Stupid 
newbie me! =) I usually have a hard time relating OSG and OpenGL (which I'm no 
expert btw), but in the end the concepts are all the same!!!

I just have a small little question: when you multiply your screen coordinates 
by the inverse matrix you are using the z values of 0.0 and 1.0 for the points 
on the near and far planes, right? Are you using these values because they were 
previously set on your projection matrix or for some other reason?

All in all, I think my problem will be solved now! Thank you so very much 
again! I appreciate all your help and good will!


Cheers,
Theo

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Re: [osg-users] osgviewerd cow.osg ---no data loaded

[Randy]

Hi Tom,
Thanks for your reply. But I didn't use it on remote machine.

Best regards,
Randy

-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tom Pearce
Sent: Thursday, July 08, 2010 6:10 AM
To: osg-users@lists.openscenegraph.org
Subject: [!! SPAM] Re: [osg-users] osgviewerd cow.osg ---no data loaded

Hi,


> Error: [Screen #0] ChooseMatchingPixelFormat<> -Unable to choose the
requested pixel format 



I've had this error pop up while trying to run OSG applications on a remote
machine via Windows remote desktop - don't know if that's what you're doing,
but if so, it's probably where the issue is arising.

Cheers,
Tom

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Re: [osg-users] osgviewerd cow.osg ---no data loaded

[Randy]

Hi J-S,
I find the "BUILD_OSG_PLUGINS " is OFF and "FREETYPE_LIBRARY_DEBUG "is not
found either. But according to the
"http://www.openscenegraph.org/projects/osg/wiki/Support/PlatformSpecifics/V
isualStudio", If I have installed "3rdparty libraries", the two above should
be different. Does it means I have not got "Freetype plugin"?
I do really find that there is a warning :Could not find plugin to read
objects from file "...\arial.ttf"...

Best regards,
Randy

-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of
Jean-Sébastien Guay
Sent: Wednesday, July 07, 2010 9:09 PM
To: OpenSceneGraph Users
Subject: [!! SPAM] Re: [osg-users] osgviewerd cow.osg ---no data loaded

Hi Randy,

> Thanks for your explicit response!
> Yes, I've solved this problem and the cow could appear.
> But another question now:
> The command line shows an error after "osgviewerd cow.osg": Error: [Screen
#0] ChooseMatchingPixelFormat<>  -Unable to choose the requested pixel
format
> Any suggestion?
> Thanks again!

Do you have OpenGL drivers installed for whatever graphics hardware your 
machine has? That should not happen for the window that osgviewer tries 
to open - it specifies a basic pixel format that should work pretty much 
everywhere.

Also - I notice you're using debug binaries, which won't be what causes 
the above problem, but for performance in the future you should also 
compile OSG in release, and generally use its own applications and 
examples in release mode, it gives a better impression of what OSG can do.

Hope this helps,

J-S
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 http://whitestar02.webhop.org/
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Re: [osg-users] Windows 7 Aero Color Scheme issue

[Prakhar Jain]

I am also having the same problem with osgviewer. However I dont get this
problem when I run my own osg application.


Thanks,
Prakhar


On Thu, Jul 8, 2010 at 3:14 AM, Guy Volckaert wrote:

> I'm having the same problem on my laptop (single screen). When I launch the
> osgViewer application, the screen gets rendered for  1 frame and then the
> entire window becomes black. If I use ALT-TAB to cycle back and forth, then
> the scene gets rendered correctly.
>
> As you mentioned, it's very irritating.
>
> I was wondering if anyone looked into this since?
>
> Cheers,
> Guy
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=29807#29807
>
>
>
>
>
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Prakhar Jain,
IIT Delhi,
New Delhi - 110016
mindfields@gmail.com
voice +919899520167
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Re: [osg-users] Windows 7 Aero Color Scheme issue

[Serge Lages]

Hi,

I have this problem with all my applications, but haven't found time to
investigate, currently our solution is to disable Aero...

Cheers,

On Thu, Jul 8, 2010 at 6:01 AM, Prakhar Jain wrote:

> I am also having the same problem with osgviewer. However I dont get this
> problem when I run my own osg application.
>
>
> Thanks,
> Prakhar
>
>
> On Thu, Jul 8, 2010 at 3:14 AM, Guy Volckaert 
> wrote:
>
>> I'm having the same problem on my laptop (single screen). When I launch
>> the osgViewer application, the screen gets rendered for  1 frame and then
>> the entire window becomes black. If I use ALT-TAB to cycle back and forth,
>> then the scene gets rendered correctly.
>>
>> As you mentioned, it's very irritating.
>>
>> I was wondering if anyone looked into this since?
>>
>> Cheers,
>> Guy
>>
>> --
>> Read this topic online here:
>> http://forum.openscenegraph.org/viewtopic.php?p=29807#29807
>>
>>
>>
>>
>>
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>>
>
>
>
> --
> -
> Prakhar Jain,
> IIT Delhi,
> New Delhi - 110016
> mindfields@gmail.com
> voice +919899520167
>
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>


-- 
Serge Lages
http://www.tharsis-software.com
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