OsgOSG利用DrawCallback实现动画效果(Qt5.14.2+osgE3.6.5+win10)No24DrawCallback

相交资料：

https://www.cnblogs.com/coolbear/p/8578677.html

https://blog.csdn.net/wang15061955806/article/details/51039177

https://www.freesion.com/article/98571463684/

https://download.csdn.net/download/zhujianqiangqq/86398450 CSDN代码包下载

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 <QApplication>
 2 
 3 #include <osg/Node>
 4 #include <osg/Group>
 5 #include <osg/Geode>
 6 #include <osg/Geometry>
 7 #include <osg/Texture2D>
 8 #include <osg/StateSet>
 9 #include <osg/PositionAttitudeTransform>
10 #include <osgViewer/Viewer>
11 #include <osgDB/ReadFile>
12 #include <osgParticle/PrecipitationEffect>
13 // 雨雪效果
14 #include <osg/MatrixTransform>
15 // 粒子效果
16 #include <osgParticle/PrecipitationEffect>
17 #include <osgParticle/Particle>
18 #include <osgParticle/LinearInterpolator>
19 #include <osgParticle/ParticleSystem>
20 #include <osgParticle/RandomRateCounter>
21 #include <osgParticle/PointPlacer>
22 #include <osgParticle/RadialShooter>
23 #include <osgParticle/ModularEmitter>
24 #include <osgParticle/ParticleSystemUpdater>
25 #include <osgParticle/ModularProgram>
26 #include <osgUtil/Optimizer>
27 #include <osgUtil/Simplifier>
28 #include <osgParticle/FireEffect>
29 // 雾
30 #include <osg/Fog>
31 #include <osgDB/ReadFile>
32 #include <osgViewer/Viewer>
33 #include <osg/StateSet>
34 #include <osg/StateAttribute>
35 #include <osgViewer/ViewerEventHandlers>
36 #include <osgWidget/ViewerEventHandlers>
37 //
38 #include <QDebug>
39 
40 class MyDrawCallback : public osg::Drawable::DrawCallback
41 {
42 public:
43     void drawImplementation(osg::RenderInfo &renderInfo, const osg::Drawable *drawable) const
44     {
45         static double dColor = 0;//颜色
46         glColor3f(dColor, 0, 0);
47         glBegin(GL_TRIANGLES);//在OSG中画一个opengl三角形
48         glVertex3f(0.0, 0.0, -2.0);
49         glVertex3f(0.2, 0.0, -2.0);
50         glVertex3f(0.0, 0.4, -2.0);
51         glEnd();
52         dColor += 0.01;//颜色渐变
53         if (dColor > 1.0)
54         {
55             dColor = 0.0;
56         }
57     }
58 };
59 
60 int main(int argc, char *argv[])
61 {
62     osgViewer::Viewer viewer;
63     osg::Geometry* geometry = new osg::Geometry;
64     //此处一定要把显示列表设置为false,
65     //否则DrawCallback的drawImplementation()函数只会调用一次，而不是在画一帧时都动态更新opengl图形
66     geometry->setUseDisplayList(false);
67     geometry->setDrawCallback(new MyDrawCallback);//Drawable设置动态更新opengl图形
68     osg::Geode* geode = new osg::Geode;
69     geode->addDrawable(geometry);
70     geode->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
71     osg::Group* group = new osg::Group;
72     group->addChild(geode);
73     viewer.setSceneData(group);
74     viewer.setUpViewInWindow(35, 35, 500, 500);
75 //    return viewer.run();
76     osg::Matrix mt;
77     mt.makeIdentity();
78     while (!viewer.done())
79     {
80         viewer.getCamera()->setViewMatrix(mt);
81         viewer.frame();
82     }
83 }

View Code

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原文地址：https://www.cnblogs.com/FKdelphi/p/16575949.html