Re: [osg-users] Calculating variables for setProjectionMatrixAsOrtho2D
Hi David, Thanks for your reply! Yes, I have set a view matrix. For the time being, I have created manually a matrix that works with a perspective view. So I should expect this also would work with the ortho2D view. But it still doesn't work, so maybe that's the problem? Right now this is my viewmatrix: Viewer-getCamera()-setViewMatrixAsLookAt(osg::Vec3d(-3254.245223,582.225235,243.433186), osg::Vec3d(-3253.255848,582.274344,243.296343), osg::Vec3d(0.136638,0.007528,0.990592)); I positioned my object the way I wanted an printed the matrix values. So that's how I got these variables. Thank you! Cheers, Marco -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=59680#59680 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Calculating variables for setProjectionMatrixAsOrtho2D
Hi,
I made a small test application. Try it out if you want to and see it it works
and does what you want.
Code:
int main( int argc, char **argv )
{
osg::Group *root = new osg::Group;
osg::Group *scene = GetScene(); // - Cows, planes and stuff
root-addChild( scene );
// Graphics Context and Traits
osg::ref_ptrosg::GraphicsContext::Traits traits = new
osg::GraphicsContext::Traits;
traits-windowName = Test app;
traits-screenNum = 0;
traits-x = 0;
traits-y = 0;
traits-width = WIDTH;
traits-height = HEIGHT;
traits-windowDecoration = false;
traits-doubleBuffer = true;
traits-sharedContext = 0;
traits-samples = 8;
traits-useCursor = true;
traits-alpha = 1.0;
const std::string version( 3.1 );
traits-glContextVersion = version;
osg::ref_ptrosg::GraphicsContext gc =
osg::GraphicsContext::createGraphicsContext( traits.get() );
// Viewer
osg::ref_ptrosgViewer::Viewer viewer = new osgViewer::Viewer();
viewer-getCamera()-setProjectionMatrixAsOrtho( -100, 100, -100, 100,
-100, 100 );
viewer-getCamera()-setCullingMode( osg::CullSettings::NO_CULLING );
viewer-getCamera()-setComputeNearFarMode(
osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR );
viewer-getCamera()-setGraphicsContext( gc.get() );
viewer-getCamera()-setViewport( new osg::Viewport( 0, 0, WIDTH,
HEIGHT) );
viewer-setThreadingModel( osgViewer::ViewerBase::SingleThreaded );
viewer-setCameraManipulator( new osgGA::TrackballManipulator );
viewer-setSceneData( root );
viewer-realize();
while( !viewer-done() )
{
viewer-advance();
viewer-eventTraversal();
viewer-updateTraversal();
viewer-renderingTraversals();
}
return 0;
}
Thank you!
Cheers,
David
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Re: [osg-users] Calculating variables for setProjectionMatrixAsOrtho2D
Hi,
Thanks for your help. I got it working! 8) |-) :D
Looks like it forgot tyo set a viewport and cameramanipulator.
Without these, apparantly it doesn't work... :?
Although I stripped down the code.
I think some parts of the code aren't that important, but maybe that's just my
opinion.
Here's the stripped down code:
Code:
int main( int argc, char **argv )
{
osg::Node *scene = osgDB::readNodeFile(d:/openscenegraph-data/cow.osg); //
- Cows, planes and stuff
// Viewer
osg::ref_ptrosgViewer::Viewer viewer = new osgViewer::Viewer();
viewer-setUpViewInWindow(50,50,640,480);
viewer-getCamera()-setProjectionMatrixAsOrtho( -1000, 1000, -1000, 1000,
-300, 300 );
//viewer-getCamera()-setComputeNearFarMode(
osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR ); //You can do it without
computing. This is a matter of taste
viewer-setCameraManipulator( new osgGA::TrackballManipulator );
viewer-setSceneData( scene );
viewer-realize();
while( !viewer-done() )
{
viewer-frame();
}
return 0;
}
Kudo's to David for giving me the great and useful example!
I'm very happy and satisfied with the result! 8) 8)
Thank you!
Cheers,
Marco
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Re: [osg-users] Calculating variables for setProjectionMatrixAsOrtho2D
Hi, Maybe it's your near far values. Your model might be placed in origo with bounds smaller than 1. And your near value starts at 1. Try: Code: Viewer-getCamera()-setProjectionMatrixAsOrtho(bb.xMin(),bb.xMax(),bb.yMin(),bb.yMax(),-100,100); Thank you! Cheers, David -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=59677#59677 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Calculating variables for setProjectionMatrixAsOrtho2D
Hi everyone, I found another picture that may help describe what I am looking for... [Image: http://www.vis-sim.com/imgdp/vp_chanprojections_01.jpg ] I am not sure if this is the same way OSG uses the given variables, but I have no reason to believe it is different... I've tried to use some more variations in the variables, still no sign of the cessna-plane... :( Hope this helps..! Thank you! Cheers, Marco -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=59644#59644 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Calculating variables for setProjectionMatrixAsOrtho2D
mkliko wrote: Hi everyone, The setProjectionMatrixAsOrtho2D-function is not really clear to me. I have tried a lot of different variables to give to this funtion. But they all result in a sceen with a blue background. Not even a small part of the object I am trying to see. What I have is a 3D-model (like cow.osg of cessna.osg) and I want a side view in Ortho 2D. Can anyone help me with calculating suitable values? I found and tried the example below, but no luck... :( (Source: http://osdir.com/ml/OpenSceneGraph-Users/2008-05/msg00027.html) Code: osg::ref_ptrosg::Node node; Viewer-setSceneData(node); osg::BoundingBox bb; bb.expandBy(node-getBound()); double xMid = (bb.xMin() + bb.xMax())/2; double yMid = (bb.yMin() + bb.yMax())/2; double zMid = (bb.zMin() + bb.zMax())/2; double radius = bb.radius(); Viewer-getCamera()-setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR); Viewer-getCamera()-setProjectionMatrixAsOrtho(bb.xMin(),bb.xMax(),bb.yMin(),bb.yMax(),1,100+abs(bb.zMax() - bb.zMin())); Viewer-setUpViewInWindow(x, y, width, height); Thank you! Cheers, Marco -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=59638#59638 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
