TROUBLE PICKING OBJECTS

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Anatoli

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Mar 8, 2008, 1:19:29 PM3/8/08
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Hallo! I'm trying to select a node by clicking with left mouse button
on them with the following piece of code:

When I run this code, the objects highlighted are mostly near my mouse
click. But they are weirdly picked(not a simple translation from where
I've clicked).

myViewer::myViewer( QWidget *parent, const char *name)
:myQglViewer(parent,name)
{
myViewer::selection = new SoSelection; // myQglViewer parent class
created a scene
// ->
make myViewer::selection new root for that scene

myViewer::selection->ref();

myViewer::selection->addChild(scene);

sm->setSceneGraph(myViewer::selection);

myViewer::selection->policy = SoSelection::SHIFT;

myViewer::selection->addSelectionCallback(&myViewer::madeSelection,
(void*)1L);
myViewer::selection-
>addDeselectionCallback(&myViewer::madeSelection, (void*)0L);

modelGeometry = new SoGroup;

scene->addChild(modelGeometry);

//fill scene with objects
modelGeometry->addChild(...)
modelGeometry->addChild(...)
...
}

this calls myQglViewer(parent, name) to create a QGLWidget with
members: scene, scenemanager, camera and headlight which looks as
follows:

myQglViewer::myQglViewer(QWidget *parent, const char *name)
: QGLWidget(QGLFormat(QGL::DoubleBuffer | QGL::DepthBuffer |
QGL::AlphaChannel | QGL::DirectRendering) , parent, name),
{
SoDB::init();

vpr = new SbViewportRegion(400, 400);
sm = new SoSceneManager();
scene = new SoSeparator();
scene->ref();
camera = new SoPerspectiveCamera;
scene->addChild(camera);

headlight = new SoPointLight;
scene->addChild(headlight);

sm->setSceneGraph(scene);


SoGLRenderAction *ra = new SoBoxHighlightRenderAction(*vpr);
sm->setGLRenderAction(ra);
}

Now because I'm not using SoQtRenderArea or similar classes I have to
translate QEvent to SoEvent manually
I do it this way:

void myViewer::mousePressEvent(QMouseEvent *e)
{
myQglViewer::mousePressEvent(e); //allows parent viewer to keep
rotating view on mouse interaction

if(e->button() == e->LeftButton)
{
SoMouseButtonEvent *mbev = new SoMouseButtonEvent;

mbev->setButton(SoMouseButtonEvent::BUTTON1);
mbev->setState(SoButtonEvent::DOWN);
mbev->setPosition(SbVec2s(e->x(), vpr->getWindowSize()[1] - e->y()
- 1));
mbev->setAltDown((e->state()&e->AltButton));
mbev->setCtrlDown((e->state()&e->ControlButton));
mbev->setShiftDown((e->state()&e->ShiftButton));
mbev->setTime(SbTime::getTimeOfDay());

cout << "MOUSE POS x = " << e->x() << "; y = " << e->y() << endl;

SoHandleEventAction *heva = new SoHandleEventAction(*vpr);
heva->setEvent(mbev);
heva->apply(myViewer::selection);
}
}

I do the same for mouseReleaseEvent and mouseMoveEvent. mouseMoveEvent
I translate to Location2Event


Your help is very appreciated=) Didn't sleep the whole night to fix
this, but no luck!

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