osg动画

#include <osgViewer/Viewer> #include <osg/MatrixTransform> #include <osgDB/ReadFile> #include <osg/Callback> #include <osgAnimation/Animation> class RotateCallback : public osg::NodeCallback { public: RotateCallback(osgAnimation::Animation *dls) { _startTick = osg::Timer::instance()->tick(); _animation = dls; } virtual void operator()(osg::Node* node, osg::NodeVisitor* nv) { osg::MatrixTransform *mt = dynamic_cast<osg::MatrixTransform*>(node); if (mt) { double currentTick = osg::Timer::instance()->tick(); double elaspedTime = osg::Timer::instance()->delta_s(_startTick, currentTick); _animation->resetTargets(); _animation->setPlayMode(osgAnimation::Animation::LOOP); _animation->update(elaspedTime); _animation->setWeight(1.0); osgAnimation::ChannelList cls = _animation->getChannels(); double currentRot = dynamic_cast<osgAnimation::DoubleTarget*>(cls.at(0)->getTarget())->getValue(); osg::Quat rotQuat(currentRot, osg::Z_AXIS); osg::Matrix rotMatrix(rotQuat); mt->setMatrix(rotMatrix); } traverse(node, nv); } protected: osgAnimation::Animation* _animation; double _startTick; }; int main() { osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer; osg::ref_ptr<osg::Node> cowNode = osgDB::readNodeFile("cow.osg"); osg::ref_ptr<osg::MatrixTransform> root = new osg::MatrixTransform; root->addChild(cowNode); osgAnimation::DoubleKeyframe keyframe1(0.0, 0.0); osgAnimation::DoubleKeyframe keyframe2(10.0, osg::PI * 2); osg::ref_ptr<osgAnimation::DoubleKeyframeContainer> keyframeContainer = new osgAnimation::DoubleKeyframeContainer(); keyframeContainer->push_back(keyframe1); keyframeContainer->push_back(keyframe2); osg::ref_ptr<osgAnimation::DoubleLinearSampler> sampler = new osgAnimation::DoubleLinearSampler(); sampler->setKeyframeContainer(keyframeContainer.get()); osg::ref_ptr<osgAnimation::DoubleLinearChannel> channel = new osgAnimation::DoubleLinearChannel(); channel->setSampler(sampler.get()); osg::ref_ptr<osgAnimation::Animation> animation = new osgAnimation::Animation(); animation->addChannel(channel.get()); root->addUpdateCallback(new RotateCallback(animation.get())); viewer->setUpViewInWindow(200, 200, 800, 600); viewer->setSceneData(root); return viewer->run(); }