osg::ComputeBoundsVisitor用于獲取模型或繪制幾何體的最小包圍盒。如下代碼：

#include<osg/Geometry> #include<osg/Geode> #include<osgViewer/Viewer> #include<osgViewer/ViewerEventHandlers> #include <osg/Node> #include <osg/Geode> #include <osg/Group> #include <osgViewer/Viewer> #include <osgDB/ReadFile> #include <osgDB/WriteFile> #include<osg/DrawPixels> #include<osg/PositionAttitudeTransform> #include<osg/computeBoundsVisitor> #include<osg/MatrixTransform> #include<osg/ShapeDrawable> #include<osg/Shape> #include<osg/PolygonMode> int main(int argc, char *argv[]) {osg::ref_ptr<osgViewer::Viewer> spViewer = new osgViewer::Viewer();osg::ref_ptr<osg::Group> spGroup = new osg::Group();osg::ref_ptr<osg::Node> spNode = osgDB::readNodeFile("cow.osg");spGroup->addChild(spNode);spViewer->setSceneData(spGroup);osg::ComputeBoundsVisitor boundsVist;spNode->accept(boundsVist);osg::BoundingBox box = boundsVist.getBoundingBox();//OSG_NOTIFY(osg::ALWAYS) << "bound info:" << std::endl;;osg::notify(osg::ALWAYS) << "bouding box info" << std::endl;osg::notify(osg::ALWAYS) << "center x:" << box.center().x() << std::endl;osg::notify(osg::ALWAYS) << "center y:"<< box.center().y() << std::endl;;osg::notify(osg::ALWAYS) << "center z:" << box.center().z() << std::endl;;osg::notify(osg::ALWAYS) << "x max:" << box.xMax() << std::endl;osg::notify(osg::ALWAYS) << "x min:" << box.xMin() << std::endl;osg::notify(osg::ALWAYS) << "y max:" << box.yMax() << std::endl;osg::notify(osg::ALWAYS) << "y min:" << box.yMin() << std::endl;osg::notify(osg::ALWAYS) << "z max:" << box.zMax() << std::endl;osg::notify(osg::ALWAYS) << "z min:" << box.zMin() << std::endl;// 畫個外框osg::ref_ptr<osg::Geode>spGeodeBox = new osg::Geode();spGeodeBox->addDrawable(new osg::ShapeDrawable(new osg::Box(box.center(), box.xMax() - box.xMin(), box.yMax() - box.yMin(), box.zMax() - box.zMin())));osg::ref_ptr<osg::StateSet> spGeodeStateSet = spGeodeBox->getOrCreateStateSet();// 采用線框模式，以便能看見里面的模型即cow.osgosg::ref_ptr<osg::PolygonMode> spGeodePolygon = new osg::PolygonMode(osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::LINE);spGeodeStateSet->setAttribute(spGeodePolygon);spGroup->addChild(spGeodeBox);spViewer->setUpViewInWindow(10, 10, 800, 600);spViewer->realize();spViewer->run();return 0; }

獲取cow.osg模型最小包圍盒的中心點及x、y、z坐標的最大、最小值，輸入如下：

注意：上面的osg::notify(osg::ALWAYS)輸出信息時，后面要加回車換行，否則日志信息只輸入到緩沖區，而不會立即輸出到控制臺

模型顯示效果如下：

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