OSG学习：转动的小汽车示例

来源：互联网发布：大数据框架hadoop 编辑：程序博客网时间：2024/04/29 15:24
由于只是简单的示例，所以小汽车的模型也比较简单，是由简单的几何体组成。
代码如下：
#include <osg\ShapeDrawable>#include <osg\AnimationPath>#include <osg\MatrixTransform>#include<osgDB\ReadFile>#include<osgViewer\Viewer>osg::MatrixTransform* createTransformNode(osg::Drawable* shape, const osg::Matrix& matrix){osg::ref_ptr<osg::Geode> geode = new osg::Geode;geode->addDrawable(shape);osg::ref_ptr<osg::MatrixTransform> trans = new osg::MatrixTransform;trans->addChild(geode.get());trans->setMatrix(matrix);return trans.release();}osg::AnimationPathCallback* createWheelAnimation(const osg::Vec3& base){osg::ref_ptr<osg::AnimationPath> wheelPath = new osg::AnimationPath;wheelPath->setLoopMode(osg::AnimationPath::LOOP);wheelPath->insert(0.0, osg::AnimationPath::ControlPoint(base, osg::Quat()));wheelPath->insert(0.01, osg::AnimationPath::ControlPoint(base + osg::Vec3(0.0f, 0.02f, 0.0f), osg::Quat(osg::PI_2, osg::Z_AXIS)));wheelPath->insert(0.02, osg::AnimationPath::ControlPoint(base + osg::Vec3(0.0f, -0.02f, 0.0f), osg::Quat(osg::PI, osg::Z_AXIS)));osg::ref_ptr<osg::AnimationPathCallback> apcb = new osg::AnimationPathCallback;apcb->setAnimationPath(wheelPath.get());return apcb.release();}int main(int argc, char** argv){osg::ref_ptr<osg::ShapeDrawable> mainRodShape = new osg::ShapeDrawable(new osg::Cylinder(osg::Vec3(), 0.4f, 10.0f));osg::ref_ptr<osg::ShapeDrawable> wheelRodShape = new osg::ShapeDrawable(new osg::Cylinder(osg::Vec3(), 0.4f, 8.0f));osg::ref_ptr<osg::ShapeDrawable> wheelShape = new osg::ShapeDrawable(new osg::Cylinder(osg::Vec3(), 2.0f, 1.0f));osg::ref_ptr<osg::ShapeDrawable> bodyShape = new osg::ShapeDrawable(new osg::Box(osg::Vec3(), 6.0f, 4.0f, 14.0f));osg::MatrixTransform* wheel1 = createTransformNode(wheelShape.get(), osg::Matrix::translate(0.0f, 0.0f, -4.0f));wheel1->setUpdateCallback(createWheelAnimation(osg::Vec3(0.0f, 0.0f, -4.0f)));osg::MatrixTransform* wheel2 = createTransformNode(wheelShape.get(), osg::Matrix::translate(0.0f, 0.0f, 4.0f));wheel2->setUpdateCallback(createWheelAnimation(osg::Vec3(0.0f, 0.0f, 4.0f)));osg::MatrixTransform* wheelRod1 = createTransformNode(wheelRodShape.get(),osg::Matrix::rotate(osg::Z_AXIS, osg::X_AXIS)*osg::Matrix::translate(0.0f, 0.0f, -5.0f));wheelRod1->addChild(wheel1);wheelRod1->addChild(wheel2);osg::MatrixTransform* wheelRod2 = static_cast<osg::MatrixTransform*>(wheelRod1->clone(osg::CopyOp::SHALLOW_COPY));wheelRod2->setMatrix(osg::Matrix::rotate(osg::Z_AXIS, osg::X_AXIS)*osg::Matrix::translate(0.0f, 0.0f, 5.0f));osg::MatrixTransform* body = createTransformNode(bodyShape.get(), osg::Matrix::translate(0.0f, 2.2f, 0.0f));osg::MatrixTransform* mainRod = createTransformNode(mainRodShape.get(), osg::Matrix::identity());mainRod->addChild(wheelRod1);mainRod->addChild(wheelRod2);mainRod->addChild(body);osg::ref_ptr<osg::Group> root = new osg::Group;root->addChild(mainRod);osgViewer::Viewer viewer;viewer.setSceneData(root.get());return viewer.run();}
结果图：
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