[osg-users] Step by step addDrawable and visualize current scene graph

[Paul Jurczak]

Thank you, Nathan. It solves my problem.

On Tuesday, March 23, 2021 at 12:14:59 PM UTC-6 nmiel... at gmail.com wrote:

> Paul,
>
> Looking at the OSG Viewer.cpp code, the run() function contains this code:
>     if (!getCameraManipulator() && getCamera()->getAllowEventFocus())
>     {
>         setCameraManipulator(new osgGA::TrackballManipulator());
>     }
>
> Therefore, by adding this line before viewer.frame() is called makes the 
> spheres appear as you expected:
>     viewer.setCameraManipulator(new osgGA::TrackballManipulator());
>
> -Nathan
>
>
> On Sun, Mar 21, 2021 at 5:31 PM 'Paul Jurczak' via OpenSceneGraph Users <
> osg-... at googlegroups.com> wrote:
>
>> I'm just starting with OSG. I would like this (or similar) code: 
>>
>>     int main() {
>>       osgViewer::Viewer viewer;
>>       osg::Geode*       geode = new osg::Geode();
>>     
>>       viewer.setSceneData(geode);
>>       geode->addDrawable(new osg::ShapeDrawable(new 
>> osg::Sphere(osg::Vec3(0, 0, 0), 1)));
>>     
>>       viewer.frame();
>>       this_thread::sleep_for(seconds(2));
>>     
>>       geode->addDrawable(new osg::ShapeDrawable(new 
>> osg::Sphere(osg::Vec3(2, 0, 0), 1)));
>>       
>>       return viewer.run();
>>     }
>>
>> to display the first sphere and after 2s the second sphere, but it 
>> displays a blank screen for 2s instead and 2 spheres afterwards. What do I 
>> have to change?
>>
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>>
>

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