I'm showing a large map over a terrain. In the beginning the user sees the
whole map from above (call it "position 0"). I want to create an animation
before that, with the camera approaching the terrain from very far, up to
the initial position (position 0). Only then the user will be able to
control the camera with mouse and keyboard. The camera will also slow down
as it approaches. The whole animation only needs to last 1 or 2 seconds.
I've tried following the first example of chapter 5 from osgCookbook (by
Rui Wang & Xuelei Qian). My code is:
osg::Quat quad0;
controller->setTransformation(osg::Vec3(lonC,latC,800), quad0 ); //
lonC and latC are central coordinates of the map. This works without the
animation
// Animating the camera
osg::ref_ptr<osgAnimation::FloatLinearChannel> ch = new
osgAnimation::FloatLinearChannel;
ch->setName( "euler" );
ch->setTargetName( "CamAnimCallback" );
osgAnimation::FloatKeyframeContainer* kfs =
ch->getOrCreateSampler()->getOrCreateKeyframeContainer();
kfs->clear(); // why is this needed?
kfs->push_back( osgAnimation::FloatKeyframe(0.0, 800) ); // from up
above...
kfs->push_back( osgAnimation::FloatKeyframe(1.0, 80) ); // down until
it gets close to the map
osg::ref_ptr<osgAnimation::Animation> animation = new
osgAnimation::Animation;
animation->setPlayMode( osgAnimation::Animation::ONCE );
animation->addChannel( ch.get() );
osg::ref_ptr<osgAnimation::UpdateMatrixTransform> updater = new
osgAnimation::UpdateMatrixTransform("CamAnimCallback");
updater->getStackedTransforms().push_back( new
osgAnimation::StackedTranslateElement("euler", osg::Vec3(lonC,latC,800)) );
// initial position
osg::ref_ptr<osgAnimation::BasicAnimationManager> manager = new
osgAnimation::BasicAnimationManager;
manager->registerAnimation( animation.get() );
osgViewer::ViewerBase::Cameras cameras;
viewer.getCameras(cameras);
osg::Camera* camera = cameras[0];
camera->setUpdateCallback( updater.get() );
root->setUpdateCallback( manager.get() );
Then I tried to call the animation right before the main loop, and also
after viewer.frame (running only once, due to "splash", that begins as true)
viewer.frame();
if( splash )
{
manager->playAnimation( animation.get() );
splash = false;
}
However, nothing worked. Any ideas or an example that does something like
this?
Rodrigo.
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