Osg-Osg利用NodeCallback实现对象旋转(Qt5.14.2+osgE3.6.5+win10)-No27-NodeCallback

相关资料：

https://www.cnblogs.com/k5bg/p/11465921.html

实例代码：

.pro

 1 QT       += core gui widgets
 2 QT       += opengl
 3 TARGET = TestOsgQt
 4 TEMPLATE = app
 5 DEFINES += QT_DEPRECATED_WARNINGS
 6 CONFIG += c++11
 7 
 8 SOURCES += \
 9         main.cpp
10 
11 HEADERS +=
12 
13 OsgDir = D:\\Gitee\\osg365R
14 CONFIG(release, debug|release) {
15         LIBS += -L$${OsgDir}/lib/ -losgDB -losgViewer -lOpenThreads -losgAnimation -losg \
16                                   -losgEarth -losgEarthAnnotation -losgEarthFeatures -losgEarthSymbology -losgEarthUtil \
17                                   -losgQOpenGL -losgUtil -losgText -losgTerrain -losgSim \
18                                   -losgShadow -losgParticle -losgManipulator -losgGA -losgFX \
19                                   -losgWidget
20 } else {
21         LIBS += -L$${OsgDir}/debug/lib/ -losgDBd -losgViewerd -lOpenThreadsd -losgAnimationd -losgd \
22                                   -losgEarthd -losgEarthAnnotationd -losgEarthFeaturesd -losgEarthSymbologyd -losgEarthUtild \
23                                   -losgQOpenGLd -losgUtild -losgTextd -losgTerraind -losgSimd \
24                                   -losgShadowd -losgParticled -losgManipulatord -losgGAd -losgFXd \
25 }
26 
27 LIBS += -lOpenGL32
28 LIBS += -lGlU32
29 
30 INCLUDEPATH += $${OsgDir}/include
31 DEPENDPATH += $${OsgDir}/include

View Code

main.cpp

 1 #include <osgViewer/Viewer>
 2 
 3 #include <osg/Node>
 4 #include <osg/Geode>
 5 #include <osg/Group>
 6 #include <osg/NodeCallback>
 7 #include <osg/MatrixTransform>
 8 
 9 #include <osgDB/ReadFile>
10 #include <osgDB/WriteFile>
11 
12 #include <osgUtil/Optimizer>
13 
14 //从 osg::NodeCallback 继承一个新类，实现 spaceship 的回调
15 class SpaceShipCallback : public osg::NodeCallback
16 {
17 public:
18     SpaceShipCallback():angle(0)
19     {
20     }
21     virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
22     {
23         //创建矩阵变换节点
24         osg::ref_ptr<osg::MatrixTransform> mtCow = dynamic_cast<osg::MatrixTransform*>(node);
25         //创建矩阵
26         osg::Matrix mr;
27         //旋转绕Z轴 每次旋转angle角度
28         mr.makeRotate(angle, osg::Vec3(0.0f, 0.0f, 1.0f));
29         //设置矩阵
30         mtCow->setMatrix(mr);
31         angle += 0.01;
32         //继续传递参数，执行其他设置回调的节点
33         traverse(node, nv);
34     }
35 public:
36     //旋转角度
37     double angle;
38 };
39 
40 int main()
41 {
42     osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();
43     osg::ref_ptr<osg::Group> root = new osg::Group();
44     //读取奶牛模型
45     osg::ref_ptr<osg::Node> node = osgDB::readNodeFile("D:\\Gitee\\data\\cow.osg");
46     //创建矩阵变换节点
47     osg::ref_ptr<osg::MatrixTransform> mt = new osg::MatrixTransform();
48     mt->addChild(node.get());
49     //设置更新回调
50     mt->setUpdateCallback(new SpaceShipCallback());
51     root->addChild(mt.get());
52     //优化场景数据
53     osgUtil::Optimizer optimizer;
54     optimizer.optimize(root.get());
55     viewer->setSceneData(root.get());
56     viewer->setUpViewInWindow(50,50,500,400);
57     viewer->realize();
58     viewer->run();
59 
60     return 0;
61 }