Hi Thomas,
Il 6/11/2010 3:45 AM, Thomas Canipel ha scritto:
its normal that when you set an osg::Group as the SceneData that when you add a
child the viewer is notify and update the graphic, imaging that you have to
create 1000 of objects, if you have to recreate a a root and set it to the
viewer each time its a pain...
Well, that's clear of course ;)
, for the detail you can lok the function insertCHild() of osg::Group , you
will see that there is a a call to a callback to traverse the new scene updated.
OK, a sort of Observer pattern then.
THe problem you get with the manipulator is pretty odd , can you give more
detail ?
Basically that's the real problem I'm experiencing. To reproduce it, I
just modified a little bit the "example_osgviewerQT" shipped with the
osg distribution. That example uses osgDB::readNodeFiles to load a node
from file (and it works correctly). Then the original code simply does
as follows:
ViewerQT* viewer = new ViewerQT;
viewer->setCameraManipulator(new osgGA::TrackballManipulator);
* viewer->setSceneData(loadedModel.get());
*
I modified that lines with the following code:
ViewerQT* viewer = new ViewerQT;
viewer->setCameraManipulator(new osgGA::TrackballManipulator);
* osg::ref_ptr<osg::Group> root = new osg::Group;
viewer->setSceneData(root);
root->addChild(loadedModel.get());
*
As you can see I simply created a Group node, set it as the scene data
of the viewer and then added the loaded node to the Group.
With this code I can see two problems. First of all the loaded object is
not fitted in the viewer. Then using the mouse to rotate
(leftmouse+move), translate (middle mouse+move) or zoom (right
mouse+move), I just can see the effect of rotation, while the loaded
objet does not move in the viewer in the other two cases.
On the contrary if I use a slightly different code
ViewerQT* viewer = new ViewerQT;
viewer->setCameraManipulator(new osgGA::TrackballManipulator);
osg::ref_ptr<osg::Group> root = new osg::Group;
* root->addChild(loadedModel.get());
viewer->setSceneData(root);
*
all works fine but of course I cannot set manually the scene data to a
viewer each time an object is added to the scene, right? Can somebody
help me please?
Regards
Gianni
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