OsgOsg实例实现环境雨效果(Qt5.14.2+osgEarht3.6.5+win10)No3EnvironmentRain

相关资料：

https://blog.csdn.net/chlk118/article/details/47009027?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-4.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-4.control

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>
// 雾
#include <osg/Fog>
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
#include <osg/StateSet>
#include <osg/StateAttribute>
#include <osgViewer/ViewerEventHandlers>
#include <osgWidget/ViewerEventHandlers>

int main(int argc, char *argv[])
{
    osg::Group* root = new osg::Group();
    // ------------------雨----------------------
    osg::Matrixd matrixEffect;
    matrixEffect.makeTranslate(osg::Vec3d(0.0, 1.0, 0.0));
    // 设置粒子位置
    osg::ref_ptr<osg::MatrixTransform> trans = new osg::MatrixTransform;
    // 对粒子范围进行了放大
    trans->setMatrix(matrixEffect * osg::Matrixd::scale(100, 100, 100));
    // 创建雨粒子
    osg::ref_ptr<osgParticle::PrecipitationEffect> pe =
    new osgParticle::PrecipitationEffect;
    pe->rain(1.0);
    pe->setUseFarLineSegments(true);
    // iLevel参数是一个int值，表示雨的级别，一般1-10就够用了
    int iLevel = 1;
    pe->setParticleSize(iLevel / 10.0);
    // 设置颜色
    pe->setParticleColor(osg::Vec4(1, 1, 1, 1));

    trans->addChild(pe);
    root->addChild(trans);
    // ---------------设置窗体口显示-----------
    //最后，设置视窗类并进入仿真循环。
    osgViewer::Viewer viewer;
    //设置图形环境特性
    osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits();
    traits->x = 100;
    traits->y = 200;
    traits->width = 600;
    traits->height = 500;
    traits->windowDecoration = true;
    traits->doubleBuffer = true;
    traits->sharedContext = 0;
    //创建图形环境特性
    osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
    if (gc.valid())
    {
        osg::notify(osg::INFO)<<"  GraphicsWindow has been created successfully."<<std::endl;

        //清除窗口颜色及清除颜色和深度缓冲
        gc->setClearColor(osg::Vec4f(0.2f,0.2f,0.6f,1.0f));
        gc->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    }
    else
    {
        osg::notify(osg::NOTICE)<<"  GraphicsWindow has not been created successfully."<<std::endl;
    }
    //设置视口
    viewer.getCamera()->setViewport(new osg::Viewport(0,0, traits->width, traits->height));
    //设置图形环境
    viewer.getCamera()->setGraphicsContext(gc.get());
    viewer.setSceneData( root );
    return viewer.run();
}