[osg-users] Qt (4.x) and QGraphicsScene
Hi folks, I know this has been issued before, but I need some example to do the following: 1. Let the viewer render to an offscreen-target. 2. Use the Qt Graphicsscene to display the rendered scene as background image. 3. Let Qt render the other items in the graphicsview. Can someone give me a minimal example or some hints to do this right. I'm not an Qt-expert, so I'm asking if someone has some example ready to use. It would also make a good example for the OSG, as this might be a common task if someone was about to create some interactive map etc. cheers Sebastian ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Drawing lines using OpenGL ES 2.0
I found a solution which involves computing the barycentric coordinates.
However it seems that is not working properly.
To compute the barycentric coordinates I need to associate to the vertices of
the triangles a coordinate among
(1,0,0) (0,1,0) (0,0,1)
for doing that I use the following function, which is based on the assumption I
load the 3d model using the option noTriStripPolygons so that each polygon is a
triangle (and not a strip of triangles).
Code:
void OSGGraphicsUtils::setBarycentricCoordinates(osg::Node * object,
osg::Program *shaderProgram)
{
GeodeFinder myGeodeFinder;
std::vector osg::Geode * listOfGeodes;
object-accept(myGeodeFinder);
listOfGeodes = myGeodeFinder.getNodeList();
std::cout there are listOfGeodes.size() geodes std::endl;
for (int j = 0; j listOfGeodes.size() ; j++)
{
//get the current geode
osg::Geode* currentGeode = listOfGeodes.at(j);
if (currentGeode != NULL)
{
for (int i = 0; i currentGeode-getNumDrawables(); i++)
{
osg::Geometry *cubeGeometry =
currentGeode-getDrawable(i)-asGeometry();
if (!cubeGeometry) continue;
int numAttribs =
cubeGeometry-getVertexArray()-getNumElements();
std::cout number of vertices is numAttribsstd::endl;
osg::ref_ptr osg::Vec3Array cubeVertexVector;
if (! strcmp (cubeGeometry-getVertexArray()-className(),
Vec3Array))
{
cubeVertexVector = (osg::Vec3Array *)
cubeGeometry-getVertexArray();
} else {
//handle the error however you want -- here all I do is
print a warning and bail out.
std::cerr Unexpected VertexArray className.\n
std::endl;
return;
}
osg::Vec3Array *array = new
osg::Vec3Array(cubeVertexVector-size());
std::map osg::Vec3, int vertexMap;
osg::Vec3 nextVertex;
int j = 0;
for (int i = 0; i cubeVertexVector-size(); i++) {
nextVertex = cubeVertexVector-at(i);
if (j == 3) j = 0;
if(vertexMap.find(nextVertex) == vertexMap.end())
{//check if it is the first, the second o the third vertex
of the triangle and associate appropriate attribute
if (j==0)
{
array-at(i) = (osg::Vec3(1.0,0.0,0.0));
vertexMap[nextVertex] = i;
}
else if (j==1)
{
array-at(i) = (osg::Vec3(0.0,1.0,0.0));
vertexMap[nextVertex] = i;
}
else if (j==2)
{
array-at(i) = (osg::Vec3(0.0,0.0,1.0));
vertexMap[nextVertex] = i;
}
}
else
{
//std::cout Vertex already present in the map at
index vertexMap[nextVertex] std::endl;
array-at(i) =
osg::Vec3(array-at(vertexMap[nextVertex]));
}
j++;
}
if( !cubeGeometry-getVertexAttribArray( 31 ) )
{
//cubeGeometry-setVertexAttribData(31,
osg::Geometry::ArrayData(array,osg::Geometry::BIND_PER_VERTEX, GL_FALSE ) );
std::cout setting barycentric attr unit array of size
array-getNumElements() std::endl;
cubeGeometry-setVertexAttribArray(31, array);
cubeGeometry-setVertexAttribBinding(BARYCENTRIC_ATTR_UNIT,
osg::Geometry::BIND_PER_VERTEX);
}
}
}
}
}
The attribute is binded to the program with the line of code
Code:
void OSGGraphicsUtils::loadShaders(osg::ref_ptrosg::StateSet objectStateSet,
const char *vsSource, const char *fsSource, osg::ref_ptrosg::Node object,
const char *shaderName)
{
// set shader for mammoth
osg::ref_ptrosg::Program shaderProgram = new osg::Program;
shaderProgram-setName(shaderName);
shaderProgram-addShader( new osg::Shader( osg::Shader::VERTEX, vsSource )
);
shaderProgram-addShader( new osg::Shader( osg::Shader::FRAGMENT, fsSource
) );
objectStateSet = object-getOrCreateStateSet();
objectStateSet-setAttributeAndModes(shaderProgram, osg::StateAttribute::ON
);
if (strcmp(shaderName,ShaderWireframe)==0)
{
std::cout adding
Re: [osg-users] Track map on a 3D view
Hi All, to disable mouse intaraction I used: view-getCamera()-setAllowEventFocus(false); Does it make sense? Is there a better way? In case this another option I have to set manually in my track map object copy constructor since a clone method is not available for a view. Moreover, I set a camera manipulator to the track map view just to call home() method to fit the track. In fact the home() implementation works only if a manipulator is set. Since I really don't need a manipulator fot that view, what should I do get the same behavior without a manipulator? Regards, Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57061#57061 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Track map on a 3D view
Hi Gianni, since you dont need manipulator for the map view you can only set the viewmatrix. Something like view-getCamera()-setViewMatrixAsLookAt() and you make a top down view Nick On Mon, Nov 4, 2013 at 3:24 PM, Gianni Ambrosio ga...@vi-grade.com wrote: Hi All, to disable mouse intaraction I used: view-getCamera()-setAllowEventFocus(false); Does it make sense? Is there a better way? In case this another option I have to set manually in my track map object copy constructor since a clone method is not available for a view. Moreover, I set a camera manipulator to the track map view just to call home() method to fit the track. In fact the home() implementation works only if a manipulator is set. Since I really don't need a manipulator fot that view, what should I do get the same behavior without a manipulator? Regards, Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57061#57061 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- trajce nikolov nick ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] How to detect scene changes?
Hi, I am trying to find a way to detect any changes of the scene graph automatically? I would like to implement an undo/redo mechanism and also I would like to know when my scene changes and needs to be saved. For example I would like a callback is called when a manipulator changes a transformation node (avoiding modification on manipulators) Is there something already implemented in OSG that can help me? Thank you! Cheers, Ale -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57063#57063 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to detect scene changes?
Hi Ale, There is no such capability built-in. You need to build your own layer on top to manage changes to the scene graph. You should write your own manipulator (or modify an existing one) to route changes through your change management layer, rather than having it change the underlying transform node directly. I have found the best practice is to treat osg as just the display layer it is intended to be, and not to try and use it as your application's primary data model. Good luck, Peter On 11/4/2013 10:02 AM, Ale Maro wrote: Hi, I am trying to find a way to detect any changes of the scene graph automatically? I would like to implement an undo/redo mechanism and also I would like to know when my scene changes and needs to be saved. For example I would like a callback is called when a manipulator changes a transformation node (avoiding modification on manipulators) Is there something already implemented in OSG that can help me? Thank you! Cheers, Ale -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57063#57063 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Peter Amstutz Senior Software Engineer Technology Solutions Experts Natick, MA 02131 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to detect scene changes?
Hi Peter, thanks for the reply. At the moment the only part I have not separated from osg layer are transformations so I will need to modify manipulators. Cheers, Ale -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57065#57065 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] CompositeViewer regression between OSG 3.1.4 and 3.2
Here is a minimal program that demonstrates the issue.
OSG 3.2: the mouse scroll wheel works in the inset view; all other mouse
events pass through to the underlying view.
OSG 3.1.4: works as expected.
#include osgViewer/CompositeViewer
#include osgDB/ReadFile
int main(int argc, char** argv)
{
osg::ArgumentParser arguments(argc,argv);
osg::Node* node = osgDB::readNodeFiles(arguments);
if ( !node ) return -1;
osgViewer::CompositeViewer cv( arguments );
osgViewer::View* mainview = new osgViewer::View();
mainview-setUpViewInWindow( 100, 100, 1600, 1024 );
mainview-setSceneData( node );
cv.addView( mainview );
osg::GraphicsContext* gc = mainview-getCamera()-getGraphicsContext();
osg::Camera* camera = new osg::Camera();
camera-setGraphicsContext( gc );
camera-setViewport( 20, 20, 700, 500 );
camera-setProjectionMatrixAsPerspective( 45.0, 7.0/5.0, 1.0, 1e6 );
osgViewer::View* insetview = new osgViewer::View();
insetview-setCamera( camera );
insetview-setSceneData( node );
cv.addView( insetview );
cv.run();
}
Glenn Waldron / @glennwaldron
On Fri, Nov 1, 2013 at 3:47 PM, Glenn Waldron gwald...@gmail.com wrote:
Hi folks,
I have an app that uses a CompositeViewer with one Master View that
fills the window and multiple inset Views that sit on top of the main
View. All Views share the same scene graph, but you can manipulate each one
separately.
In OSG 3.1.4 this worked, but after upgrading the OSG 3.2, now none of the
inset Views response to the mouse (except for the scroll wheel, which
oddly appears for work as before). Instead, mouse actions in any inset are
handled only by the master View.
I've tracked some significant changes in View.cpp and related classes but
before delving too deeply I'd love to hear whether anyone's seen or
addressed this issue first. Thanks to all.
Glenn Waldron / @glennwaldron / osgEarth
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Re: [osg-users] Grayscale texture
Hi, I notice that glCompressedTexImage2D takes the longest time during texture loading. Can I understand what does this function actually does? I thought the texture decompression is handled by GPU, and loading to GPU actually should be significantly fast. In my testing, uncompress texture loads faster than compressed texture and this does not make sense to me. I will like to reduce the time in glCompressedTexImage2D as it ia significant in my application. Can somebody please advise me? Thanks. Kind Regards, Jimmy -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57068#57068 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] again_question about black-out(BO) of airport runway(light control)
Hi, guys i m trying to develop flight simulation with osg. as i attached the picture, i used 3DViewer program to load the .ive airport map. and you can see the black-out(BO) of airport runway and the properties of light point. so my question is is it possible and how to control the black-out(BO) of airport runway(light control)? i want to turn on(or off) the light. Thanks in advance guys ; ) Cheers, Kim -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57069#57069 Attachments: http://forum.openscenegraph.org//files/ive_light_108.png ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
