hi in order to display a rectangle roi over the 3d scene i use the example
provided in osg hud. however before drawing the roi i press a toggle selection
button which gets the stateset of the main camera as given below
Code:
osg::StateSet *stateSet = osg_viewer->getCamera()->getOrCreateStateSet();
osg::Point *pointState =
(osg::Point*)stateSet->getAttribute(osg::StateAttribute::POINT);
The 2d rectangle is drawn by mouse drag using the handler function. In the
handler function the slave camera is created and added to the viewer as
addSlave.
Code:
case(osgGA::GUIEventAdapter::PUSH):
{
camera_slaveBBox = createBBoxCamera();
viewer->addSlave(camera_slaveBBox, false);
}
As the mouse the dragged the rectangle is drawn and all is good untill......On
pressing the toggle selection button again in the first code "stateSet" is now
returned NULL :(
Now if i comment
Code:
//commentviewer->addSlave(camera_slaveBBox, false)
then stateSet indeed has some value. whats is the problem?
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http://forum.openscenegraph.org/viewtopic.php?p=38572#38572
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