Must add viewer.realize() before EarthManipulator.setViewpoint(Viewpoint)?

[smarttigerfly]

When I build and run example osgearth_transform with Visual Studio Community 2022 on Win 10, the result is incorrect:

int
main(int argc, char** argv)
{
    osgEarth::initialize();

    ...
    osg::ref_ptr<osg::Node> model = osgDB::readRefNodeFile("cow.osgt.10000.scale.osgearth_shadergen");
    ...

    osgEarth::Viewpoint vp;
    vp.setNode(app.geo);
    vp.heading()->set(-45.0, Units::DEGREES);
    vp.pitch()->set(-20.0, Units::DEGREES);
    vp.range()->set(model->getBound().radius() * 10.0, Units::METERS);
    em->setViewpoint(vp);

    return viewer.run();
}

I run osgearth_transform.exe in command-line, the result is:

.\osgearth_transform.exe tests/simple.earth

And I add viewer.realize(); before em->setViewpoint(vp);:

    ...

    osgEarth::Viewpoint vp;
    vp.setNode(app.geo);
    vp.heading()->set(-45.0, Units::DEGREES);
    vp.pitch()->set(-20.0, Units::DEGREES);
    vp.range()->set(model->getBound().radius() * 10.0, Units::METERS);
    

    viewer.realize();

    em->setViewpoint(vp);

    return viewer.run();

the result is:

the statement em->setViewpoint(vp); works.

[gwaldron]

I am not able to reproduce this in the main master branch. Which version of osgEarth are you using?

[smarttigerfly]

The version is:

PS E:\vcpkg> osgearth_version.exe
DisplaySettings::SHADER_GL3
osgEarth 3.3.0 build 135