Re: [osg-users] culling / bounding calculation for shader scaled geometries
Thanks for the hint! I forgot to mention this. Using setCullingActive( false ) works, but I want the item to be culled if it is completely outside the viewport. Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=75745#75745 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] culling / bounding calculation for shader scaled geometries
Hi all, I need to display textured items in a pixel-constant size even on zooming. For my implementation I use the position as vertices and store the size in the normals. The vertex shader handles it all corrrectly and the image is shown in a constant size. Unfortunately these items are culled if the position is outside the viewport. That's bad :-( I tried to use setInitialBound() with a maximum area to define the bounding box to prevent these items from being culled away. But instead of keeping the items on screen this results in scaled items! What other way could I go to prevent the items from beeing culled? Maybe I have to read back the vertices somehow? Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=75742#75742 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] I need any ideas on how to wait for all outstanding frame-calls
Hi Robert, thanks for the quick reply. Do you mean the osgposter example? I will dig into this over the next days. Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=75664#75664 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] I need any ideas on how to wait for all outstanding frame-calls
Hi all,
I need any ideas on how to wait for all outstanding or pending frame-calls.
What I try to do is have a rendering on demand mode for a viewer showing a
geotiff (using osgearth). Currently it takes several frame-calls to have the
image in a clear state. And is state is the item I want to wait for, before
start doing something else.
Currently the implementation starts with calling
OsgMapManipulator::centerMapAtPosition(). As next step I tried doing different
approaches like:
Code:
while (viewer->checkEvents() )
{
viewer->frame()
}
or
Code:
while (viewer->checkEvents() )
{
viewer->renderTraversas()
}
or
Code:
while (viewer->checkNeedToDoFrame() )
{
viewer->frame()
}
Unfortunately nothing worked as I expected.
Anyone out here in the forum who is able to give me the 'right' hint which item
to ask in which way to be sure, that the rendered viewer content could be
labeled 'stable'?
Thank you!
Cheers,
Christoph[/list]
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Re: [osg-users] Idea to implement a kind of 'rubber mode'
Hi Laurens, in the end it took some time but finally I could create source to create the eraser and it is up and running quite smooth. Thank you! Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=75156#75156 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Idea to implement a kind of 'rubber mode'
Hi Laurens, it's working if I reduce the current drawing sources to fixed function pipeline. But unfortunately we use several shaders. As far as I understand the idea, I will need to access the ColorMask from within the fragment shader, right? Any hints for that or am I totally wrong? Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=74736#74736 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Idea to implement a kind of 'rubber mode'
Thank you, Laurens! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=74725#74725 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Idea to implement a kind of 'rubber mode'
Yes, Laurens, that's exactely what I was looking for! Do you have any source which created the file? Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=74720#74720 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Idea to implement a kind of 'rubber mode'
Hi Daniel, it's not a drawing programm. Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=74718#74718 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Idea to implement a kind of 'rubber mode'
Hi Chris, the original goal is drawing a decorated line where the decoration interrupts and keep the background visible. I tried to visualize the elements and the seps which are acutally working. I got a few keywords like 'stencil', 'render to texture' but the samples are all related to textured items covering textured items and not to polylines covered by textured items. Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=74716#74716 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Idea to implement a kind of 'rubber mode'
Well, Chris, thanks for the question. It shows that I was not precise enough. Currently I'm drawing the black line on top of a quite complex background (light blue). And as a second item I draw the quad with the red frame showing the green symbol and having transparent colour in the background so the scene background hat visible and the black line. My goal is to use the textured quad as a rubber and remove the black line but not the scene background like in symbol.png. I hope that clarified it a bit more?! Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=74709#74709 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Idea to implement a kind of 'rubber mode'
Hi all, I'm looking for some inspiration for solving the following 'problem': Currently I'm drawing basic line geometries like in attachment line.png. And I'm able to draw items above the geometries (combo.png). But the final goal must be some kind of 'rubber mode' which makes the geometry transparent and keeps the background (liek in symbol.png). What may be the technique to solve this? Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=74703#74703 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] strange behaviour with osgText::Text
Hi,
I have a strange effect with osgText::Text. My original goal was to have a
constant pixel-sized Text close to the starting point of a line. Using dummy
values everthing is fine. But using real values the textsize changes!
See the attached source. The wrong behaviour could be seen by setting
USE_WRONG_VALUES to 1 and the right behaviour could be seen by setting it to 0.
I use OSG 3.6.1 under opensuse.
Thank you!
Cheers,
Christoph
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#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
static const char * vLineShader = {
"#version 330 core\n"
"in vec4 osg_Vertex;\n"
"in vec4 osg_Color;\n"
"uniform mat4 osg_ModelViewProjectionMatrix;\n"
"out vec4 vertexColor;\n"
"void main(void)\n"
"{\n"
"gl_Position = osg_ModelViewProjectionMatrix * osg_Vertex;\n"
"vertexColor = osg_Color; \n"
"}\n"
};
static const char * fLineShader = {
"#version 330 core\n"
"in vec4 vertexColor;\n"
"void main(void)\n"
"{\n"
"gl_FragColor = vertexColor;\n"
"}\n"
};
#define USE_WRONG_VALUES 1
osg::ref_ptr buildLine()
{
osg::ref_ptr geometry = new osg::Geometry;
geometry->setUseDisplayList(false);
osg::ref_ptr vertices = new osg::Vec3Array;
#if defined( USE_WRONG_VALUES ) && USE_WRONG_VALUES
vertices->push_back( osg::Vec3( 7300.0, 1300.0, 0.0 ) );
vertices->push_back( osg::Vec3( 7400.0, 1400.0, 0.0 ) );
vertices->push_back( osg::Vec3( 7500.0, 1400.0, 0.0 ) );
#else
vertices->push_back( osg::Vec3( 0.0, 0.0, 0.0 ) );
vertices->push_back( osg::Vec3( 10.0, 10.0, 0.0 ) );
vertices->push_back( osg::Vec3( 20.0, 10.0, 0.0 ) );
#endif
geometry->setVertexArray( vertices );
osg::ref_ptr drawElements = new osg::DrawElementsUInt( osg::PrimitiveSet::LINE_STRIP, 0 );
drawElements->push_back( 0 );
drawElements->push_back( 1 );
geometry->addPrimitiveSet( drawElements );
osg::ref_ptr color( new osg::Vec4Array );
color->push_back( osg::Vec4( 1.0, 0.0, 0.0, 1.0 ) );
geometry->setColorArray( color, osg::Array::BIND_OVERALL );
geometry->getOrCreateStateSet()->setAttributeAndModes( new osg::LineWidth( 10 ), osg::StateAttribute::ON );
osg::ref_ptr program = new osg::Program;
program->addShader(new osg::Shader(osg::Shader::VERTEX, vLineShader));
program->addShader(new osg::Shader(osg::Shader::FRAGMENT, fLineShader));
geometry->getOrCreateStateSet()->setAttributeAndModes(program, osg::StateAttribute::ON);
return geometry;
}
osg::ref_ptr buildText()
{
osg::ref_ptr textItem = new osgText::Text;
textItem->setFont( "/home/chris/SOURCEN/OpenSceneGraph-TrainingMaterials-CAE/Data/OpenSceneGraph-Data/fonts/times.ttf" );
textItem->setColor( osg::Vec4( 0.0, 1.0, 0.0, 1.0 ) );
textItem->setText( "FOO" );
textItem->setAxisAlignment( osgText::Text::SCREEN );
textItem->setFontResolution( 40, 40 );
textItem->setCharacterSize( 32 );
textItem->setCharacterSizeMode( osgText::Text::SCREEN_COORDS );
textItem->setDrawMode( osgText::Text::TEXT | osgText::Text::BOUNDINGBOX );
textItem->setAlignment( osgText::TextBase::CENTER_CENTER );
#if defined( USE_WRONG_VALUES ) && USE_WRONG_VALUES
textItem->setPosition( osg::Vec3( 7300.0, -1500.0, 0.0 ) );
#else
textItem->setPosition( osg::Vec3( -5.0, -5.0, 0.0 ) );
#endif
return textItem;
}
osg::ref_ptr buildIt()
{
osg::Group * group = new osg::Group;
group->addChild( buildLine() );
group->addChild( buildText() );
return group;
}
int main ( int argc, char **argv )
{
// constrcut the viewer.
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments( , argv );
osgViewer::Viewer viewer( arguments );
viewer.setSceneData( buildIt() );
viewer.realize();
osg::DisplaySettings::instance()->setTextShaderTechnique( "NONE" );
osg::State * state = viewer.getCamera()->getGraphicsContext()->getState();
if ( 0 == state )
{
state = new osg::State;
}
state->setUseModelViewAndProjectionUniforms( true );
state->setUseVertexAttributeAliasing( true ) ;
viewer.getCamera()->getGraphicsContext()->setState( state );
viewer.getCamera()->getOrCreateStateSet()->setMode( GL_BLEND, osg::StateAttribute::ON );
viewer.getCamera()->getOrCreateStateSet()->setMode( GL_DEPTH_TEST, osg::StateAttribute::OFF );
viewer.getCamera()->getOrCreateStateSet()->setMode( GL_LIGHTING, osg::StateAttribute::OFF );
// run the viewers main loop.
return viewer.run();
}
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Re: [osg-users] conversion from .vert/.frag files to cpp inline
Hi Robert, that's it, I tried several osg examples but missed the osg2cpp one :-( Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=73643#73643 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] conversion from .vert/.frag files to cpp inline
Hi all, is there any easy 'conversion utility' to create cpp inlined definition of shader sources from .vert / .frag files? Thanks! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=73641#73641 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Shaders with multiple views using ViewportCallback
Hi Robert,
I just tried the uniform setting for the camera and it worked quite nice.
But I'm not able to use a callback to do the updating stuff :-(.
I tried to install this callback:
Code:
struct ViewportCallback : public osg::Uniform::Callback
{
ViewportCallback( osg::Camera* camera )
: _camera( camera )
{
std::cout << "ViewportCallback::ViewportCallback()" << std::endl;
}
virtual void operator()( osg::Uniform* uniform, osg::NodeVisitor* /*nv*/)
{
std::cout << "ViewportCallback::operator()" << std::endl;
osg::Viewport * vp( _camera->getViewport() );
uniform->set( osg::Vec4( vp->x(), vp->y(), vp->width(), vp->height() )
);
}
osg::Camera* _camera;
};
and set it via
Code:
osg::Viewport * vp( viewer.getCamera()->getViewport() );
osg::Uniform * viewportUniform = new osg::Uniform( "viewport", osg::Vec4(
vp->x(), vp->y(), vp->width(), vp->height() ) );
viewportUniform->setUpdateCallback( new ViewportCallback(
viewer.getCamera() ) );
viewer.getCamera()->getOrCreateStateSet()->addUniform( viewportUniform );
But I don't get any output from operator() nor do I get an updated viewport
value in my shader.
What's wrong with this?
Thank you!
Cheers,
Christoph
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Re: [osg-users] Shaders with multiple views using ViewportCallback
Ahhh, Robert, thanks, that's the trick :-) Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=73575#73575 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Shaders with multiple views using ViewportCallback
Hi all, I need to use the viewport dimensions for some calculations in my vertex shader. The most found way of doing the update of the viewport-size uniform is the ViewportCallback derived from osg::Uniform::Callback which encapsulates a camera. But what happens if I have multiple views? How can I fetch the viewport size in my shader per viewer? Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=73573#73573 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] How to fill a polygon with a hatch pattern
Hi, I have to fill a given polygon with a hatch pattern. The pattern could be horizontal, vertical, diagonal or a combination of them. Is it possible to define a state or add something to the drawable to achieve this? Thank you! Cheers, Christoph -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=60238#60238 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
