Re: [osg-users] Cut a surface

[Vincent Bourdier]

Pedro Xavier Contla a écrit :

Hi,

... I'm new in OSG, and I want to cut a surface with a plane...

Do someone have an idea??


Thank you!

Cheers,
Pedro

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Hi,

You can also use the planeIntersector which can return you the 
intersected points.

See the examples for that.

Regards,
  Vincent.


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Re: [osg-users] Cut a surface

[Roland Smeenk]

Hi Pedro,

this is typically done with a clip plane. This OpenGL functionality is wrapped 
in the osg::ClipPlane stateattribute that you can add to a stateset.

kind regards,

Roland Smeenk

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Re: [osg-users] [osgPlugins] OSG and Collada with animation Example

[Roland Smeenk]

Hi Pradeep,

The current Collada loader does not support loading of animations.
I partially implemented animation loading in the Collada loader and others are 
working on improving it, but these changes are not submitted for inclusion in 
osg yet.

kind regards,

Roland Smeenk

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[osg-users] [osgPlugins] new-bee question on mdl and md2 samples

[Pradeep Balasundaram]

Hi,


Has anyone successfully used an the mdl and md2 plugins to introduce
characters in to osg? If so, can I get an example project for the same?
I appreciate any help extended. 
... 

Thank you!

Cheers,
pradeep

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[osg-users] [osgPlugins] OSG and Collada with animation Example

[Pradeep Balasundaram]

Hi,

I'm a newbie to OSG.
Can anyone point me to an example where a collada model is being
imported in to OSG and its animation invoked. Kinda OSG + character animation 
with collada working together

Thank you!

Cheers,
Pradeep

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Re: [osg-users] Cut a surface

[Tomlinson, Gordon]

I recommend a very sharp pair of scissors 


Gordon
Product Manager 3d
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Email  : gtomlinson @ overwatch.textron.com
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-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Pedro
Xavier Contla
Sent: Tuesday, September 22, 2009 4:28 PM
To: osg-users@lists.openscenegraph.org
Subject: Re: [osg-users] Cut a surface

Hi,

... I'm new in OSG, and I want to cut a surface with a plane...

Do someone have an idea??


Thank you!

Cheers,
Pedro

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Re: [osg-users] Cut a surface

[Pedro Xavier Contla]

Hi,

... I'm new in OSG, and I want to cut a surface with a plane...

Do someone have an idea??


Thank you!

Cheers,
Pedro

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Re: [osg-users] [osgPlugins] OpenFlight - Material export

[Paul Martz]

I just remembered... There is an export option you might try:

lighting=	Specifies a default enable/disable state for lighting. 
By default, the exporter assumes lighting is enabled (GL_LIGHTING ON). 
Set this to either ON or OFF. Example: "lighting=OFF".


It's been a while since I looked at the code, but if you pass 
"lighting=OFF" in the Options string, then the exporter might handle 
materials differently. I'm not sure about this; check the code to see 
exactly what the effects of this option are.


Paul Martz
Skew Matrix Software LLC
_http://www.skew-matrix.com_ 
+1 303 859 9466



Katharina Plugge wrote:

Hi Paul,

thanks for the fast answer and clarifications regarding handling of materials in osg, OpenGL and OpenFlight. Seems like I have not considered the whole picture. I made a few tests and everything looks fine indeed. So I aggree, this behaviour should be the default. 
For various reasons these 'added' materials are problematic for some of our applications, but I think I will find a workaround or will - as you suggested - implement and submit an alternative way for the Plugin. Have to rethink about this.


Thank you!

Cheers,
Katharina

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Re: [osg-users] Terrain generator compatible with OSG

[Chris 'Xenon' Hanson]

Felipe Lemus wrote:
> Hi,
> I am looking for a terrain generator that was compatible with OSG and if it 
> was possible easy to use. Do you know some one?
> I try it with Terragen 2 and Geocontrol2 but without succes.
> I have Autodesk 3ds MAX 2010, could I save my projects in the old format .3ds 
> to do that?

  I can probably give you some advice if I have a better idea of what you're 
starting
with, what you need to do, and what you need to end up with. Do you have 
contours in
AutoCAD, or a TIN, or what? And, what was your terrain originally -- a DEM, or 
contours?

> Cheers,
> Felipe

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Re: [osg-users] [osgPlugins] OpenFlight - Material export

[Katharina Plugge]

Hi Paul,

thanks for the fast answer and clarifications regarding handling of materials 
in osg, OpenGL and OpenFlight. Seems like I have not considered the whole 
picture. I made a few tests and everything looks fine indeed. So I aggree, this 
behaviour should be the default. 
For various reasons these 'added' materials are problematic for some of our 
applications, but I think I will find a workaround or will - as you suggested - 
implement and submit an alternative way for the Plugin. Have to rethink about 
this.

Thank you!

Cheers,
Katharina

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Re: [osg-users] [osgPlugins] OpenFlight - Palette Records prevent using of ReaderWriter Callback

[Katharina Plugge]

Hi Robert,

thanks for the fast answer. The idea to use a findFileCallback is not bad and I 
think it would be sufficient for my case. But in my opinion a change in the 
PlugIn would nevertheless be a better solution. Using a FindFileCallback does 
not allow for the differentiation if the file was intended to be read or if 
this is only a general check. (Is it garanteed that PlugIns doesnt use findFile 
to check some unrelevant/optional files or the like?) 
Furthermore using a findFileCallback implies an additional check on the file 
extension to find out, if its an image file.


Cheers,
Katharina

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Re: [osg-users] osg .net example

[Jason Beverage]

Hi Steffen,

Download the osgCppCLIDemo.rar file from here:
http://www.openscenegraph.org/projects/osg/wiki/Community/LanguageWrappers

In general, the best way (in my opinion) to use OSG in a .NET app is through
C++/CLI.  You get full access to OSG via C++ without having to worry about
language wrappers.

There is a nice snippit on how to embed an osgViewer control in a .NET
control on the FAQ here:
http://www.openscenegraph.org/projects/osg/wiki/Support/FAQ#HowdoIembedanOSGviewerina.NETcontrol

Thanks,

Jason

On Tue, Sep 22, 2009 at 9:09 AM, Steffen, Keith  wrote:

> I will repeat the request one more time.  Is there a osg/.net demo out
> there?
>
> Keith
>
> -Original Message-
> From: osg-users-boun...@lists.openscenegraph.org [mailto:
> osg-users-boun...@lists.openscenegraph.org] On Behalf Of Steffen, Keith
> Sent: Monday, September 21, 2009 10:59 AM
> To: OpenSceneGraph Users
> Subject: [osg-users] osg .net example
>
> Hi All,
>
> Does anyone have a good osg/.net example program that includes source code?
>
> Keith
>
>
>
>
>
> Open Systems International, Inc.
> Keith Steffen
>
> 3600 Holly Lane North, Suite 40
> Minneapolis, MN 55447-1286
> Phone: 763 551 0559
> Fax: 763 551 0750
> E-mail: kstef...@osii.com
> Website: http://www.osii.com/
>
>
>
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Re: [osg-users] osg .net example

[Steffen, Keith]

I will repeat the request one more time.  Is there a osg/.net demo out there?

Keith

-Original Message-
From: osg-users-boun...@lists.openscenegraph.org 
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Steffen, Keith
Sent: Monday, September 21, 2009 10:59 AM
To: OpenSceneGraph Users
Subject: [osg-users] osg .net example

Hi All,

Does anyone have a good osg/.net example program that includes source code?

Keith





Open Systems International, Inc.
Keith Steffen

3600 Holly Lane North, Suite 40
Minneapolis, MN 55447-1286
Phone: 763 551 0559
Fax: 763 551 0750
E-mail: kstef...@osii.com
Website: http://www.osii.com/



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Re: [osg-users] Geometry to raster

[Geraud De Magneval]

Hello Jean-Sébastien,

You are right when you said:

> 
> The box has 6 faces, so it's closed, and thus the intersector should find 
> intersections over the whole face that's facing the camera (where the rays 
> are being shot from). 
> 


I was thinking with 2D in mind and only thinking in intersecting my box with 
segment in X, Y forgotting the z.

Anaway I will have a look to Render To Texture examples, that seems to be more 
appropriate.

Thanks a lot.

Géraud

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Re: [osg-users] Terrain generator compatible with OSG

[Jason Beverage]

Hi Felipe,

If you are looking to build terrain databases from geospatial source data I
would recommend looking at osgEarth (http://www.osgearth.org) and
VirtualPlanetBuilder (
http://www.openscenegraph.org/projects/VirtualPlanetBuilder).  These
projects allow you to generate paged terrain databases that are meant to
work with OpenSceneGraph and are both easy to use.

Thanks,

Jason

On Tue, Sep 22, 2009 at 7:02 AM, Felipe Lemus wrote:

> Hi,
>
> I am looking for a terrain generator that was compatible with OSG and if it
> was possible easy to use. Do you know some one?
> I try it with Terragen 2 and Geocontrol2 but without succes.
> I have Autodesk 3ds MAX 2010, could I save my projects in the old format
> .3ds to do that?
>
> Thank you!
>
> Cheers,
> Felipe
>
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> http://forum.openscenegraph.org/viewtopic.php?p=17544#17544
>
>
>
>
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Re: [osg-users] [vpb] Specifying a patch level lower than the maximum terrain level

[J.P. Delport]

Hi,

thanks Luc.

For others, Luc's instructions are here:

http://www.openscenegraph.org/projects/VirtualPlanetBuilder/wiki/PatchExisting

jp

Luc Claustres wrote:

Hi,

Done, everybody is welcome to complete.

Cheers,
Luc

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Re: [osg-users] Database pager and shared texture

[Wang Rui]

Hi Alexandre,

Have a try of the osgDB::SharedStateManager. Just call:

osgDB::Registry::instance()->getOrCreateSharedStateManager();

once to wake it up.

But sometimes it may not work as you wish. I have done a similar work before
with a derived DatabasePager class. I just rewrote the updateSceneGraph()
function, checked the _dataToMergeList and combined textures with duplicate
filenames. It's a little different from SharedStateManager but useful to my
project. :)

Hope these will help.

Wang Rui

2009/9/22 Alexandre Amalric 

> Hi osg-users,
>
> I want to know if there is a way to share duplicate texture in a paged
> database.
>
> Let's take an exemple, I have a database.ive file calling a lot of external
> files model01.ive, model02.ive, model03.ive etc...
>
> In each modelXX.ive I have a geometry with a texture associated, this
> texture is a generic one and is the same for each modelXX.ive file.
> When loading database.ive I call the osgUtil optimizer with all
> optimisation on this file, but I don't know if it will optimize the external
> reference ?
>
> If not is there a way to tell the database pager to optimise the loaded
> subgraph on the run ??
>
> My goal is to get a unique instance of this generic texture when all the
> database is loaded in memory instead of loading it several times (each time
> there is a new modelXX.ive loaded).
>
> Kind regards,
>
> --
> Alexandre AMALRIC   Ingénieur R&D
> ===
> PIXXIM S.A. 73E, rue Perrin-Solliers 13006 Marseille
> http://www.pixxim.fr
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Re: [osg-users] Geometry to raster

[Jean-Sébastien Guay]

Hello Geraud,


I have a scene with an osg::Box, and I'd like to obtain a "raster" 
representation of my scene like this:

[...]

I was thinking using LineSegments to find out the intersections with the 
geometry object of the scene.
And the result will probably be:

[...]

My problem is how I could fill the cells that are inside of the box?


Why would you think you would get an empty box? The box has 6 faces, so 
it's closed, and thus the intersector should find intersections over the 
whole face that's facing the camera (where the rays are being shot 
from). But:



I am new in OSG, and I am not sure I am using the correct approach, and I could'nt find 
anything about "Vector to Raster" in osg.


I would do this as a Render-to-Texture (RTT) pass. Just set up your 
camera in ortho mode (I think that's what you're looking for, as opposed 
to perspective) and set it up to render to texture and attach an 
osg::Image of the appropriate dimensions to it. After the next frame the 
image will represent your object rasterized. This better utilizes the 
graphics hardware, as line segment intersections all happen on the CPU.


Then if all you want is to know if the object is present or not in a 
given pixel you can reduce the bit depth of the texture target (you 
would just need one bit but that's not an option, the lowest bit depth 
you can use is GL_LUMINANCE which is 8 bits).


Many OSG examples demonstrate RTT, have a look through their code to see 
examples of this.


Hope this helps,

J-S
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[osg-users] Database pager and shared texture

[Alexandre Amalric]

Hi osg-users,

I want to know if there is a way to share duplicate texture in a paged
database.

Let's take an exemple, I have a database.ive file calling a lot of external
files model01.ive, model02.ive, model03.ive etc...

In each modelXX.ive I have a geometry with a texture associated, this
texture is a generic one and is the same for each modelXX.ive file.
When loading database.ive I call the osgUtil optimizer with all optimisation
on this file, but I don't know if it will optimize the external reference ?

If not is there a way to tell the database pager to optimise the loaded
subgraph on the run ??

My goal is to get a unique instance of this generic texture when all the
database is loaded in memory instead of loading it several times (each time
there is a new modelXX.ive loaded).

Kind regards,

-- 
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===
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http://www.pixxim.fr
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[osg-users] Terrain generator compatible with OSG

[Felipe Lemus]

Hi,

I am looking for a terrain generator that was compatible with OSG and if it was 
possible easy to use. Do you know some one?
I try it with Terragen 2 and Geocontrol2 but without succes.
I have Autodesk 3ds MAX 2010, could I save my projects in the old format .3ds 
to do that?

Thank you!

Cheers,
Felipe

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[osg-users] Geometry to raster

[Geraud De Magneval]

Hi,

I have a scene with an osg::Box, and I'd like to obtain a "raster" 
representation of my scene like this:


Code:

--
--
--
--
--



I was thinking using LineSegments to find out the intersections with the 
geometry object of the scene.
And the result will probably be:

Code:

--
--
*--*--
--
--



My problem is how I could fill the cells that are inside of the box?

I am new in OSG, and I am not sure I am using the correct approach, and I 
could'nt find anything about "Vector to Raster" in osg.

Thanks a lot for help.

Regards,
Géraud
Code:




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Re: [osg-users] osgUtil::simplifier parameters

[Vincent Bourdier]

Hi Andrew

Thanks for the tip on the simplifier, lower the sample ratio is, lower the
vertex number is. (I get a crash under 0.6 but I'm not sure this is an osg
crash)
Concerning the optimiser, this do not reduce the vertex number but the
inverse... on a 460k vertices model, the optimizer returns me a 480k
vertices model ...

I'm looking for a destructive optimizer/simplifier for my model... Do you
have any other tips or idea ?

Thanks.

Regards,
   Vincent.

2009/9/21 Andrew Burnett-Thompson 

> Hi there,
>
> I've experimented with the simplifier, but am not using it.
>
> I found the setSampleRatio() method affects how coarse or fine a result you
> get. The simplification with a sample ratio less that 1.0 appears to be
> destructive (i.e. Geometry out does not equal Geometry in). So far I've not
> found the right settings to be beneficial for my needs (which is reduction
> of memory consumption while keeping the mesh the same or similar).
>
> Another way of reducing the vertex count in your scene is to use the
> Optimizer. Here I have found that using the Optimizer with the options
> MERGE_GEOMETRY, CHECK_GEOMETRY and TRISTRIP_GEOMETRY can significantly
> reduce the number of vertices/primitives in each Geometry object, while
> giving you essentially the same mesh out.
>
>
> On Mon, Sep 21, 2009 at 10:10 AM, Vincent Bourdier <
> vincent.bourd...@gmail.com> wrote:
>
>> Up ?
>>
>> No one does osg simplifications ?
>>
>> Thanks,
>>Vincent.
>>
>> 2009/9/17 Vincent Bourdier 
>>
>> Hi all,
>>>
>>> Using the osg simplifier on a geometry, I'm just surprised to see that
>>> there is no way to set a level of simplification or something like that.
>>> Maybe I didn't saw it, but for the moment I just found
>>>
>>> _sm->setDoTriStrip(true);  //what for ? do triangle strip are more
>>> optimized ?
>>> _sm->setSampleRatio(?); //what does it mean ? what does it changes ?
>>> ...
>>>
>>> How can I control the simplification level ?
>>> Is this simplifier a destructive one ? (can deform the geometry)
>>>
>>> Thanks.
>>>
>>> Regards,
>>>Vincent.
>>>
>>>
>>>
>>
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Re: [osg-users] [vpb] Specifying a patch level lower than the maximum terrain level

[Luc Claustres]

Hi,

Done, everybody is welcome to complete.

Cheers,
Luc

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