OsgOsg实例圆柱体对象局部旋转效果(Qt5.14.2+osgEarht3.6.5+win10)No11CylinderRotate

相关资料：

https://www.cnblogs.com/kekec/archive/2011/08/15/2139893.html     osg中使用MatrixTransform来实现模型的平移/旋转/缩放

代码实例：

.pro

QT       += core gui widgets
TARGET = TestOsgQt
TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS
CONFIG += c++11

SOURCES += \
        main.cpp

HEADERS +=

OsgDir = D:\\RuanJian\\osg365R
CONFIG(release, debug|release) {
        LIBS += -L$${OsgDir}/lib/ -losgDB -losgViewer -lOpenThreads -losgAnimation -losg \
                                  -losgEarth -losgEarthAnnotation -losgEarthFeatures -losgEarthSymbology -losgEarthUtil \
                                  -losgQOpenGL -losgUtil -losgText -losgTerrain -losgSim \
                                  -losgShadow -losgParticle -losgManipulator -losgGA -losgFX \
                                  -losgWidget
} else {
        LIBS += -L$${OsgDir}/debug/lib/ -losgDBd -losgViewerd -lOpenThreadsd -losgAnimationd -losgd \
                                  -losgEarthd -losgEarthAnnotationd -losgEarthFeaturesd -losgEarthSymbologyd -losgEarthUtild \
                                  -losgQOpenGLd -losgUtild -losgTextd -losgTerraind -losgSimd \
                                  -losgShadowd -losgParticled -losgManipulatord -losgGAd -losgFXd \
}


INCLUDEPATH += $${OsgDir}/include
DEPENDPATH += $${OsgDir}/include

main.cpp

#include <QApplication>

#include <osg/Node>
#include <osg/Group>
#include <osg/Geode>
#include <osg/Geometry>
#include <osg/Texture2D>
#include <osg/StateSet>
#include <osg/PositionAttitudeTransform>
#include <osgViewer/Viewer>
#include <osgDB/ReadFile>
#include <osgParticle/PrecipitationEffect>
// 雨雪效果
#include <osg/MatrixTransform>
// 粒子效果
#include <osgParticle/PrecipitationEffect>
#include <osgParticle/Particle>
#include <osgParticle/LinearInterpolator>
#include <osgParticle/ParticleSystem>
#include <osgParticle/RandomRateCounter>
#include <osgParticle/PointPlacer>
#include <osgParticle/RadialShooter>
#include <osgParticle/ModularEmitter>
#include <osgParticle/ParticleSystemUpdater>
#include <osgParticle/ModularProgram>
#include <osgUtil/Optimizer>
#include <osgUtil/Simplifier>
#include <osgParticle/FireEffect>
// 雾
#include <osg/Fog>
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
#include <osg/StateSet>
#include <osg/StateAttribute>
#include <osgViewer/ViewerEventHandlers>
#include <osgWidget/ViewerEventHandlers>
// 旋转
#include <osg/NodeCallback>
#include <osg/PositionAttitudeTransform>
#include <osgViewer/Viewer>
#include <osg/MatrixTransform>
#include <osgDB/ReadFile>
#include <osgGA/TrackballManipulator>
// 圆形
#include <osg/ShapeDrawable>

int main(int argc, char *argv[])
{ 
    // 创建圆柱体
    double r = 0.5;
    double h = 3.0;
    osg::Vec3 orginPt(0.0, 0.0, 0.0);
    osg::ref_ptr<osg::Geode> cylinderGeode = new osg::Geode;
    osg::ref_ptr<osg::Cylinder> geoCylinder = new osg::Cylinder(orginPt, r, h);
    osg::ref_ptr<osg::ShapeDrawable> cylinderDrawable = new osg::ShapeDrawable(geoCylinder.get());
    cylinderDrawable->setColor(osg::Vec4(1.0f,0.0f,0.0f,1.0f));
    cylinderGeode->addDrawable(cylinderDrawable.get());

    // -- 以下操作都是针对局部坐标系而言 --
    // 先将圆柱体平移（20.0, -12.0, -35.0）
    // 再将z轴方向旋转至向量n方向  此时局部坐标系的z轴和n向量一致
    // 接着，将旋转后的模型的沿z方向平移0.5*h长度 （全局坐标系，相当于沿n方向平移0.5*h长度）
    // 最后将模型放大2倍
    osg::Vec3 n(1.0, 1.0, -1.0);
    osg::Vec3 z(0.0, 0.0, 1.0);
    n.normalize();
    osg::ref_ptr<osg::MatrixTransform> root = new osg::MatrixTransform;
    root->setMatrix(osg::Matrix::scale(osg::Vec3(2.0, 2.0, 2.0))*
                 osg::Matrix::translate(osg::Vec3(0, 0, 0.5*h))*
            osg::Matrix::rotate(z, n)*
            osg::Matrix::translate(osg::Vec3(20.0, -12.0, -35.0)));
    root->addChild(cylinderGeode);

    osgViewer::Viewer viewer;
    //创建节点到场景中
    viewer.setUpViewInWindow(50,50,500,400);
    viewer.setSceneData(root);
    viewer.realize();
    return viewer.run();
}