Re: [osg-users] Unzip big data size problem!

[Nguyen Quang Nam]

Hi, Robert

 Thank you so much!

Cheers,
Nguyen

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Re: [osg-users] World to local coordinates

[Rambabu Repaka]

Hi,Thanks for your help and robert can u give your number where in whatsapp i 
can ask more doubts about osg.

... 

Thank you!

Cheers,
Rambabu

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Re: [osg-users] Oculus DK2 and intersections

[Matt Kennett]

aldaril_kote wrote:
> Hi Robert,
> 
> You've mentioned that osgViewer in OSG 3.4 has support of coordinates 
> remapping:
> 
> 
> robertosfield wrote:
> > 
> > In the svn/trunk and OSG-3.4 branch of the OSG there is support in 
> > osgViewer for remapping coordinates when the viewer has slave Camera's that 
> > do distortion correction via texture coordinates,
> > 
> 
> 
> Could you name entities (classes, methods, etc.), which are responsible for 
> this functionality?
> 
> Cheers,
> Maxim


Hi Maxim, 

I'm trying to do the same thing. Did you work out a solution?

Cheers, 
Matt

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Re: [osg-users] blending with shader

[David Heitbrink]

yeah basically you want to use un-warped coordinates for your blending image, 
and warped coordinates for your scene image. If not you would have to warp your 
blending image, which may be easier for you depending on process. 

As per passing your texture width, you can use the function textureSize, that 
will get the dimensions of the image:
https://www.opengl.org/sdk/docs/man4/html/textureSize.xhtml

Do keep in mind, you need to set the version number in your shader to use this. 

In our case case we basically hard coded texture width as we generated the 
shader code with our blending image, as well as a few parameters for color 
correction and a few other other things. 

You can also query the size of your texture and do a text replace on your 
shader code before loading it.

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[osg-users] osgUtil::Delaunay* question (where is the triangulation of the constraints?)

[Trajce Nikolov NICK]

Hi Community,

I hope you will help this time too. Struggling again :-).

I am trying to add cultural features to terrain models, nothing fancy (yet!
:-) ) it is simple. Code will describe it more how I am doing it but it is
the very basic, elevations array to be triangulated with some constraints.
And it works nicely. However when I want to cut the triangulated constraint
from the terrain, and add this cut triangles as separate primitive set,
constraint->getTriangles() is empty. Based on the doxygen in the header I
am expecting to have these triangles there:

/** Get the filling primitive. One:
 * triangulate must have bneen called and
 * two:  triangle list is filled when
 * DelaunayTriangulator::removeInternalTriangles is called.
 * These return the triangles removed from the delaunay triangulation by
 * DelaunayTriangulator::removeInternalTriangles. */
inline const osg::DrawElementsUInt *getTriangles() const { return
prim_tris_.get(); }

No triangles when calling this and this is the snippet:

osg::ref_ptr triangulator = new
osgUtil::DelaunayTriangulator;

osg::ref_ptr polyline = getPolylineVertices(line);
osg::ref_ptr polylineEdges = getEdges(polyline);

constraint->setVertexArray(polylineEdges);
constraint->addPrimitiveSet(new osg::DrawArrays(GL_LINE_LOOP, 0,
polylineEdges->size()));

triangulator->addInputConstraint(constraint);
triangulator->setInputPointArray(_points);
triangulator->triangulate();
triangulator->removeInternalTriangles(constraint);

osg::ref_ptr geometry = new osg::Geometry;
geometry->setVertexArray(_points);
geometry->addPrimitiveSet(triangulator->getTriangles()); // triangles with
constraint cut
geometry->addPrimitiveSet(constraint->getTriangles()); // no triangles

Thanks a bunch as always!

Nick

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Re: [osg-users] World to local coordinates

[Trajce Nikolov NICK]

Hi Rambabu,

Robert is right. We all learn from the OSG examples and from reading the
code and when we struggle we fire questions on this list and the community
responds - that is how we all gain and share OSG knowledge. It is normal
that you have to do your homework first - to look for it in the examples
code - trust me, often I find myself "lazy" and "paranoid" so I shoot
questions fast too ;-)

Have a look at the osgsimulation example code. It flies the cessna model
around the planet. That is what you need I think and you will see there how
to properly use osg::EllipsoidModel. Give it a try

Cheers!
Nick

On Fri, Nov 11, 2016 at 10:14 AM, Robert Osfield 
wrote:

> On 11 November 2016 at 09:07, Rambabu Repaka 
> wrote:
> > Thanks robert and Iam working on the EllipsoidModel.
> > One Doubt Is it possible to view  the osg model like cessan.osg using
> latitude and longitude readings at exact position.
>
> Stop being so lazy and read the code examples, read the headers, it's all
> there.
>
> If you have a problem with your specific implementation then post the code.
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Re: [osg-users] blending with shader

[Gianni Ambrosio]

Hi David,
thanks it works!

Here are my vertex and fragment shaders:

Code:

varying vec2 texCoord;

void main(void)
{
   gl_Position = ftransform();
   texCoord = gl_MultiTexCoord0.xy;
}




Code:

uniform float width;
uniform float height;
uniform float gamma;
uniform sampler2D sceneTexture;
uniform sampler2D blendTexture;
uniform sampler2D blackTexture;

varying vec2 texCoord;

void main(void) {
   vec4 sceneColor = texture2D(sceneTexture, texCoord);
   vec2 fragCoord = vec2(gl_FragCoord.x/width, gl_FragCoord.y/height);
   vec4 blendColor = texture2D(blendTexture, fragCoord);
   vec4 blackColor = texture2D(blackTexture, fragCoord);
   vec4 gammaVector = vec4(gamma, gamma, gamma, 1.0);
   gl_FragColor = pow(pow(sceneColor*blendColor, gammaVector) * (1.0 - 
pow(blackColor, gammaVector)) + pow(blackColor, gammaVector), 1.0/gammaVector);
};




I had to use fragCoord for blending images because those images must not be 
distorted.
Is that code correct? I mean, it works but maybe there is a cleaner way to 
implement that. In particulare, is there a way to avoid passing "width' and 
"height" variables to the shader?

Regards,
Gianni[/img]

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Re: [osg-users] Visual Studio 2015 3rd_party

[Björn Lindahl]

Thanks Bjorn for the osg-3rdparty-cmake project. It really helped alot. I got 
stuck on getting libtiff working with osg though and found out after banging my 
head against the wall for quite some time with the version linked to from the 
readme on github: libtiff(dot)org

Not sure if that site is getting moved or something but the last tested version 
you mention, 4.0.6 is not available from that site and there's many broken 
links on libtiff(dot)org. I actually got 4.0.6 from 
herelinuxfromscratch(dot)com which I found searching for libtiff and 4.0.6 
(can't post links)


I thought I could build libtiff myself from libtiff site (v 3.8.2) but I failed 
to get rid of linking errors when building osg using it. I tried to build dlls 
for libtiff but I failed to get rid of the linking problems.

When switching to v4.0.6 from the link above, it worked right away. Maybe 
something to note in the readme on github for others that come across the 
project.


Hi,

... 

Thank you!

Cheers,
Björn

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Re: [osg-users] How to implement pagedLOD without reading from files?

[Werner Modenbach]

Thanks Robert.

I think I should use the PluginDataMap to provide pointers to classes or
structures. Right?

Thanks again. Very quick and good help!

- Werner -

Am 11.11.2016 um 12:47 schrieb Robert Osfield:
> Hi Wener,
>
> On 11 November 2016 at 11:32, Werner Modenbach
>  wrote:
>> just one more small question.
>> As to my understanding the ReaderWriter classes are instantiated
>> automatically
>> according to the "file extensions". So I get no hands on the instances of
>> the reader.
>> How can I give the reader class a reference to my data structures?
> You can pass data into a plugin via the osgDB::Options object that you
> can pass along with the string used for the filename.  The Options
> object can store user data as well be subclassed.
>
> Robert.
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Re: [osg-users] How to implement pagedLOD without reading from files?

[Robert Osfield]

Hi Wener,

On 11 November 2016 at 11:32, Werner Modenbach
 wrote:
> just one more small question.
> As to my understanding the ReaderWriter classes are instantiated
> automatically
> according to the "file extensions". So I get no hands on the instances of
> the reader.
> How can I give the reader class a reference to my data structures?

You can pass data into a plugin via the osgDB::Options object that you
can pass along with the string used for the filename.  The Options
object can store user data as well be subclassed.

Robert.
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Re: [osg-users] How to implement pagedLOD without reading from files?

[Werner Modenbach]

Hi Chris,

just one more small question.
As to my understanding the ReaderWriter classes are instantiated
automatically
according to the "file extensions". So I get no hands on the instances
of the reader.
How can I give the reader class a reference to my data structures?

Thanks

- Werner -

Hi Chris,

thanks a lot. I knew it must be easy somehow but I was blind for the
solution.
Yes, I have to subclass ReaderWriter and that's it. Wow!

- Werner -

Am 09.11.2016 um 18:43 schrieb Chris Hanson:
> Basically you make a custom URI scheme to name each "file" in the
> PagedLOD object, like
>
> 12345567890.werner_texion_tile
>
> Then you create and register a pseudoloader that accepts requests for
> "files" ending in the ".werner_texion_tile" extension. But when your
> pseudoloader is called to "load" one of these "files", you simply
> parse the "filename" to get the tile ID from it, and then construct
> the resulting subgraph using the assets already available in memory
> (or over a network, or however you wish to get the real data to make
> the subgraph) and return it as if you had just loaded it from disk.
>
> There's nothing "disk" specific about the URI system in the PagedLOD
> subsystem.
>
> ​
>
>
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Re: [osg-users] Unzip big data size problem!

[Robert Osfield]

Hi Nam,

I have unpacked your model and then zipped then ran:

  osgviewer DL.ive.zip

This works fine with OSG-3.2.1 through to git master.  The models
loads without any errors or warnings.  This under 64bit Linux.

I can't rule out a Visual Studio specific issue, perhaps other under
Windows can test your model.

As a general note, on the topic of encryption the way you can do it is
by reading data from disk decrypt the data into a memory buffer that
you stream into the plugin that does the loading via a std stream
buffer.  This topic has been covered before on osg-users mailing
list/forum so just search for the topic in the archives.  In essense
the zip plugin uses this approach already for loading the model files.
This thread is not the appropriate place to discuss this as though so
would suggest asking questions on this one of the existing threads or
starting a new one.

Meanwhile this thread should be just kept to the issue of trying load
a zip file.  On this I can't personally do anymore, it'll be up to
yourself or others who use Windows/VisualStudio to sort out whether
there are specific problems here or whether it's just a built/usage
mistake on your side.

Robert.


On 11 November 2016 at 03:23, Nguyen Quang Nam
 wrote:
> Hi, Robert
>
> Sorry for my mistakes.
>
> Today I upload my .ive file from my PC. This file is not of mine so I can not 
> change extension.
>
> osgVersion: 3.2.1 and 3.4.0, I built it myself in windows 10 x64, compiler 
> Visual Studio 2010 x86.
>
> When I try to load another zipped file which has the size below 100Mb it is 
> OK.
>
> As I said before, my programing and 3D is limited so I can not find any 
> notices to show you. I try go to openscenegraph Source code and insert 
> osg::Notify to know zip doing is success. But then I only see "badalloc" 
> notice from a popup ( with osg 3.4.0 nothing is display, but with osg 3.2.1 
> is show error).
>
> My purpose is using zip with password to protect my sensitive data from 
> danger. Now I 've not find any methods with my bad knowledge.
> Thank you!
>
> Here is my data, please help me to detect the problem.
>
>
> Code:
> http://www.mediafire.com/file/b3v5fm5noz2qzta/DL.7z
>
>
>
> Thank you,
> Nam
>
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>
>
>
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Re: [osg-users] World to local coordinates

[Robert Osfield]

On 11 November 2016 at 09:07, Rambabu Repaka  wrote:
> Thanks robert and Iam working on the EllipsoidModel.
> One Doubt Is it possible to view  the osg model like cessan.osg using 
> latitude and longitude readings at exact position.

Stop being so lazy and read the code examples, read the headers, it's all there.

If you have a problem with your specific implementation then post the code.
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Re: [osg-users] osgText setColor problem

[Robert Osfield]

On 11 November 2016 at 06:58, Rambabu Repaka  wrote:
> Hi,Iam new to osg can anyone help me in setting a color to the 2d text.

Just look at the code. The osgtext example for instance.  It was
written *exactly* for this purpose.
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Re: [osg-users] World to local coordinates

[Rambabu Repaka]

Hi,
Thanks robert and Iam working on the EllipsoidModel.
One Doubt Is it possible to view  the osg model like cessan.osg using latitude 
and longitude readings at exact position.
... 

Thank you!

Cheers,
Rambabu

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Re: [osg-users] World to local coordinates

[Robert Osfield]

On 11 November 2016 at 07:01, Rambabu Repaka  wrote:
> I saw the osg/CoordinateSystemNode but iam unable to to locate the model 
> according to latitude and longitude readings.Please share code if anybody 
> knows.

You have access to all the source code you need - the
OpenSceneGraph/examples directory contains over 170 examples, what is
missing is your effort at searching for relevant materials.

I am not going to give you the answer as you need to develop the skill
at finding answers without needing the community to hand hold every
line of code.

You've been given the hint EllipsoidModel so go and do a search in the
OSG examples for usage of this class i.e.

cd OpenSceneGraph/examples
grep EllipsoidModel */*.cpp

You'll get:

osgautocapture/osgautocapture.cpp:
csn->getEllipsoidModel()->convertLatLongHeightToXYZ(lat, lon, alt,
eye.x(), eye.y(), eye.z());
osgfadetext/osgfadetext.cpp:csn->setEllipsoidModel(new
osg::EllipsoidModel());
osgfadetext/osgfadetext.cpp:osgText::Text*
createText(osg::EllipsoidModel* ellipsoid, double latitude, double
longitude, double height, const std::string& str)
osgfadetext/osgfadetext.cpp:osg::Node*
createFadeText(osg::EllipsoidModel* ellipsoid)
osgfadetext/osgfadetext.cpp:
csn->addChild(createFadeText(csn->getEllipsoidModel()));
osggpx/osggpx.cpp:osg::ref_ptr em = new
osg::EllipsoidModel;
osggpx/osggpx.cpp:osg::ref_ptr em = new
osg::EllipsoidModel;
osggpx/osggpx.cpp:osg::ref_ptr em = new
osg::EllipsoidModel;
osgintersection/osgintersection.cpp://osg::EllipsoidModel* em =
csn ? csn->getEllipsoidModel() : 0;
osgmultitexturecontrol/osgmultitexturecontrol.cpp:
osg::EllipsoidModel* em = csn->getEllipsoidModel();
osgposter/osgposter.cpp:csn->getEllipsoidModel()->convertLatLongHeightToXYZ(
osgsimulation/osgsimulation.cpp:csn->setEllipsoidModel(new
osg::EllipsoidModel());
osgsimulation/osgsimulation.cpp:osg::EllipsoidModel*
ellipsoid = csn->getEllipsoidModel();

This should give you plenty of code to look at.  Run these examples
and see if any function in the way you want.

Also have a look at the CoordiateSystemNode and ElipsoidModel headers,
there are methods that do exactly what you need, you just need to be
able to read C++.

Spend the time with these headers and examples and you'll learn a lot
about these particular classess, but even more important you'll
develop your skill as programmer, a key one is being able to
understand 3rd party code.

Robert.
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Re: [osg-users] How to validate the value of height Above Terrain

[Suraj Paul]

Hi Sebastian,

Thanks for the link.
... 

Thank you!

Cheers,
Suraj

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Re: [osg-users] [3rdparty] QVR: Virtual Reality library that supports OSG with Vive, Rift, OSVR, and others

[Martin Lambers]

Hi,

I clarified the statement in the README: QVR applications do not need to care 
about threads, but are still free to implement any threading model.
(QVR uses threads internally, but does not expose them to the application.)

Cheers,
Martin

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Re: [osg-users] osgText setColor problem

[Rambabu Repaka]

Hi,Iam new to osg can anyone help me in setting a color to the 2d text.

... 

Thank you!

Cheers,
Rambabu

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Re: [osg-users] How to validate the value of height Above Terrain

[Sebastian Messerschmidt]

Hi Paul,

https://en.wikipedia.org/wiki/List_of_GIS_data_sources might be good 
starting point.


cheers
Sebastian


Hi,
I checked it out.
I am missing DTED data for the terrain!

Any sources where i can get any terrain model and its corressponding DTED data?
...

Thank you!

Cheers,
Suraj

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Re: [osg-users] World to local coordinates

[Rambabu Repaka]

Hi,
I saw the osg/CoordinateSystemNode but iam unable to to locate the model 
according to latitude and longitude readings.Please share code if anybody knows.
... 

Thank you!

Cheers,
Rambabu :)  :)  :)

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Re: [osg-users] How to validate the value of height Above Terrain

[Suraj Paul]

Hi,
I checked it out. 
I am missing DTED data for the terrain! 

Any sources where i can get any terrain model and its corressponding DTED data? 
... 

Thank you!

Cheers,
Suraj

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