Re: [osg-users] VPB and terrain normals

[Trajce Nikolov NICK]

Thanks Nickolai ! :)

On Thu, Nov 24, 2016 at 7:15 PM, Nickolai Medvedev 
wrote:

> Hi, Nick! :)
>
> You try to create the implementation of a terrain?
> Try this example.
>
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>
>
>
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Re: [osg-users] VPB and terrain normals

[Nickolai Medvedev]

Hi, Nick! :)

You try to create the implementation of a terrain?
Try this example.

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18_FindingTriangles.7z
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Re: [osg-users] VPB and terrain normals

[Trajce Nikolov NICK]

Thanks Robert for the good explanation (as always ;-) ). I was looking for
the piece of the code in VPB that generates the normals, was curious about
the algo. But found it in the osgUtil::SmoothingVisitor .. This one is
actually generating very nice results.

Thanks again!

Cheers,
Nick

On Thu, Nov 24, 2016 at 4:49 PM, Robert Osfield 
wrote:

> On 24 November 2016 at 14:32, Trajce Nikolov NICK
>  wrote:
> > anyone with a knowledge if VPB is generating normals for the terrain skin
> > and can point me to the code snippet where these normals are being
> > calculated?
>
> By default VirtualPlanetBuilder creates paged databases that use
> osgTerrain::TerrainTile for the representation and rendering of the
> individual terrain tiles. The height field component
> (HeightFieldLayer) is uses an osg::HeightField internally to store all
> the heights, no normals are stored.
>
> The normals used for rendering at created by the TerrainTechnique, if
> you use the default osgTerrain::GeometryTechnhique then it'll create
> an osg::Geometry with vertices, normals and texcoords to do the
> rendering.  If you use the DisplacementMappingTechnique then it'll be
> the shaders that that will compute the normals in the vertex shader.
>
> Robert.
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Re: [osg-users] VPB and terrain normals

[Robert Osfield]

On 24 November 2016 at 14:32, Trajce Nikolov NICK
 wrote:
> anyone with a knowledge if VPB is generating normals for the terrain skin
> and can point me to the code snippet where these normals are being
> calculated?

By default VirtualPlanetBuilder creates paged databases that use
osgTerrain::TerrainTile for the representation and rendering of the
individual terrain tiles. The height field component
(HeightFieldLayer) is uses an osg::HeightField internally to store all
the heights, no normals are stored.

The normals used for rendering at created by the TerrainTechnique, if
you use the default osgTerrain::GeometryTechnhique then it'll create
an osg::Geometry with vertices, normals and texcoords to do the
rendering.  If you use the DisplacementMappingTechnique then it'll be
the shaders that that will compute the normals in the vertex shader.

Robert.
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[osg-users] VPB and terrain normals

[Trajce Nikolov NICK]

Hi Community,

anyone with a knowledge if VPB is generating normals for the terrain skin
and can point me to the code snippet where these normals are being
calculated?

Thanks a lot as always

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[osg-users] Having problems running the osgViewerWX example (GLExtensions returning as null)

[Sam Hudson]

Hi,

I'm trying to get the osgViewerWX example to work. I am using wxWidgets 3.1.0 
and OSG 3.4.0. Everything has been compiled under VS2015  for x86.

When I first attempted to compile the example there were two errors, the 
signatures for two functions had changed. One was easy to fix (parameters had 
moved around) whilst the other is not so clear cut.

osgViewerWX.cpp bool GraphicsWindowWX::makeCurrentImplementation():

Code:
_canvas->SetCurrent();


This isn't valid anymore as SetCurrent() requires a wxGLContext to be passed to 
it. I just passed _canvas to the function since it seemed like that was 
intended originally. It doesn't seem to make a difference if I comment it out.

So once I got it compile, on running, I found that an exception would be thrown 
in Renderer::initialize(osg::State* state). 

Upon inspection it seems that NULL is being returned when trying to retrieve 
the extension from the current state:


Code:
osg::GLExtensions* ext = state->get-osg::-GLExtensions-();


replaced gt and lt symbols with dashes, html filter removes them :(

I'm still learning on using OSG so I don't really know what needs to be changed 
to fix this or if this is actually a problem with my hardware. I would 
appreciate any help.

Thanks.

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Re: [osg-users] [osgPlugins] Exporting OpenFlight from OSG and DDS textures

[Sebastian Messerschmidt]

Hi,

Again, this is not an OSG-related question. You should really train your 
C++ skills before moving on to advanced topics.



Hi,What is the equivalent function for std::max in osg 3.4.0
   deltaMax  = std::max(deltaMax, delta);
  showing error not a member of std.


Without context (compiler, code, version ) it is impossible to help you.
std::max is defined in , so chances a missing include cuases 
the error are high. You could have gotten this information by using a 
search machine of your choice btw.


This hive-mind is supposed to help with more OSG-related stuff... so 
please try harder to solve the C++/programming problems before asking 
them here.


Cheers
Sebastian



...

Thank you!

Cheers,
Rambabu

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Re: [osg-users] [osgPlugins] Exporting OpenFlight from OSG and DDS textures

[Rambabu Repaka]

Hi,What is the equivalent function for std::max in osg 3.4.0
   deltaMax  = std::max(deltaMax, delta);
  showing error not a member of std.

... 

Thank you!

Cheers,
Rambabu

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Re: [osg-users] [forum] [osgEarth] several problems and questions

[Djoé Denne]

Hi,

First of all, please excuse me for my English.
I'm a beginner in osg and osgEarth (and SIG). I have to make an spatial viewing 
 application with osgEarth, so i have to use osgEarth API.

I load an not georeferenced 3D model and i have the geo information in other 
file : DATUUM, Projection system, EPSG and an offset in meter for cartographic 
system and in seconds for geo system. I looking for set those informations 
programatically. Set the SRS is not a big deal, but I don't know how to set the 
offset.

I use a osgEarth::Map object with osgEarth::ModelLayer, I set the layer and put 
it in my map, then i set the SRS of my map :

map->getSRS()->create(".")

and i create MapNode from my map. How I can set my offset ?

I also have a problem with EarthManipulator::setViewpoint(), it seems to didn't 
work. even in osgEarth example : osgearth_city, that create boston city and try 
to set a viewpoint close to boston. in the application, the viewpoint is never 
set, the view don't move.


Thank you!

Cheers,
Djoé

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Re: [osg-users] [osgPlugins] Exporting OpenFlight from OSG and DDS textures

[Robert Osfield]

On 24 November 2016 at 10:35, Rambabu Repaka  wrote:
> Hi,
>
> dynamic_cast (*_oceanSurface->getCullCallback()) 
> (_oceanSurface.get(), );
>
> still showing error .How can i do ?

This isn't an OSG or osgEarth question.

You need to learn C++ or put in a bit more effort before firing off
trivial questions to the community.

You need to fix this problem yourself, you have to keep developing
your skills as a programmer.
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Re: [osg-users] [osgPlugins] Exporting OpenFlight from OSG and DDS textures

[Rambabu Repaka]

Hi,

dynamic_cast (*_oceanSurface->getCullCallback()) 
(_oceanSurface.get(), );

still showing error .How can i do ?

... 

Thank you!

Cheers,
Rambabu

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Re: [osg-users] [osgPlugins] Exporting OpenFlight from OSG and DDS textures

[Robert Osfield]

On 24 November 2016 at 09:25, Rambabu Repaka  wrote:
> Hi,In osg 3.2.3 
> (*_oceanSurface->getCullCallback())(_oceanSurface.get(), ); is working but 
> in osg 3.4.0 error is showing
>
> Error   2   error C2064: term does not evaluate to a function taking 2 
> argumentsD:\osgocean-master1\osgocean-master\src\osgOcean\OceanScene.cpp 
> 884 1   osgOcean
>
> How can i solve this ?
>
> in osg 3.2.3 getcullcallback() is in nodecallback
> in osg 3.4.0 getcullcallback() is in callback

You will need to adjust the problem code to use a dynamic_cast<> to
osg::NodeCallback, or change the problem code to call the
osg::Callback::run(..) method.  The parameter mean and order is
identical between the two types of callback.  The osg::Callback is
more flexible, which is it's reason for use in OSG-3.4 and beyond.

Robert.
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Re: [osg-users] [osgPlugins] Exporting OpenFlight from OSG and DDS textures

[Rambabu Repaka]

Hi,In osg 3.2.3 
(*_oceanSurface->getCullCallback())(_oceanSurface.get(), ); is working but 
in osg 3.4.0 error is showing 

Error   2   error C2064: term does not evaluate to a function taking 2 
argumentsD:\osgocean-master1\osgocean-master\src\osgOcean\OceanScene.cpp 
884 1   osgOcean

How can i solve this ?

in osg 3.2.3 getcullcallback() is in nodecallback 
in osg 3.4.0 getcullcallback() is in callback


... 

Thank you!

Cheers,
Rambabu

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