OpenSceneGraph Forum

[karcios]

Hi,

QtQuick is integrated with OpenSceneGraph (osgEarth) via method 'QQuickFramebufferObject'
In QQuickFramebufferObject I had to use setMirrorVertically(true);
to get the right osg view (without mirror reflection).
The problem is with picking objects.
To get world coords from mouse position I use:

Code:

... osg::Matrixd matrix; matrix.postMult(camera->getViewMatrix()); matrix.postMult(camera->getProjectionMatrix()); matrix.postMult(camera->getViewport()->computeWindowMatrix()); ...

but it doesn't work
If I remove line:

Code:

matrix.postMult(camera->getViewport()->computeWindowMatrix());

everything works fine.

But I also checked other solution and when I use

Code:

... osg::Matrixd matrix; matrix.postMult(camera->getViewMatrix()); matrix.postMult(camera->getProjectionMatrix()); //ORIGINAL Viewport: //inline const osg::Matrix computeWindowMatrix() const //{ //return osg::Matrix::translate(1.0,1.0,1.0)*osg::Matrix::scale(0.5*width(),0.5*height(),0.5f)*osg::Matrix::translate(x(),y(),0.0f); // usually x()=0, y()=0, camera->setViewport(new osg::Viewport(0, 0, width(), height())); //} osg::Matrix testWindowMatrix = osg::Matrix::translate(1.0,1.0,1.0)*osg::Matrix::scale(0.5*WindowWidth(),0.5*WindowHeight(),0.5f)*osg::Matrix::translate(-MousePositionX, -WindowHeight()+MousePositionY,0.0f); matrix.postMult(testWindowMatrix); ...

then everything is fine.
Is it possible to inject somewhere MousePositionX,MousePositionY into the osg system?
(Then I would use osgEarth IntersectionPicker/getWorldCoordsUnderMouse() out of box)

Or maybe
ProjectionMatrix and WindowMatrix should be const, so It looks like a problem with ViewMatrix (wrong/inverted mouse positions etc)

Any ideas?


Thank you!

Cheers,
Wojtek