当前位置：网站首页>【osg】OSG开发（04）—创建多个场景视图
【osg】OSG开发（04）—创建多个场景视图
2022-06-23 22:34:00 【iriczhao】
一、开篇
在osg中，有时候需要使用到多个场景视图，每一个场景视图中有不一样的操作：例如：漫游器、照相机、粒子效果、多个模型组合等。
在OSG中，提供了osgViewer::CompositeViewer类来实现这个需求。
二、实现原理
（1）创建一个osgViewer::CompositeViewer实例
（2）使用osgViewer::View代表一个具体的View视图
（3）使用osgViewer::CompositeViewer的addView()方法将创建的osgViewer::View添加到osgViewer::CompositeViewer中
（2-1）首先读取一个模型文件：
osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("osgDatas/glider.osgt");
（2-2）创建一个osgViewer::CompositeViewer实例：
osgViewer::CompositeViewer viewer;
（2-3）创建一个osg::GraphicsContext::WindowingSystemInterface来获取窗口系统的信息，这里主要获取：主窗口id、长、宽等信息：
osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();
if (!wsi)
{
osg::notify(osg::NOTICE)<<"Error, no WindowSystemInterface available, cannot create windows."<<std::endl;
return 1;
}
unsigned int width, height;
osg::GraphicsContext::ScreenIdentifier main_screen_id;
main_screen_id.readDISPLAY();
main_screen_id.setUndefinedScreenDetailsToDefaultScreen();
//获取窗口的id号和对应的分辨率（长宽比）
wsi->getScreenResolution(main_screen_id, width, height);
（2-4）使用osg::GraphicsContext::Traits来创建一个窗口配置对象，最后使用osg::GraphicsContext的createGraphicsContext()创建显示图像的上下文：
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
traits->x = 100;
traits->y = 100;
traits->width = 1000;
traits->height = 800;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->sharedContext = 0;
traits->readDISPLAY();
traits->setUndefinedScreenDetailsToDefaultScreen();
osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
（2-5）创建四个视图
// 第一个视图
{
osgViewer::View* view = new osgViewer::View;
osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("osgDatas/fountain.osgt");
view->setName("View three");
viewer.addView(view);
view->setSceneData(scene);
view->getCamera()->setName("Cam three");
view->getCamera()->setProjectionMatrixAsPerspective(30.0, double(traits->width) / double(traits->height/2), 1.0, 1000.0);
view->getCamera()->setViewport(new osg::Viewport(0, traits->height/2, traits->width/2,traits->height/2));
view->getCamera()->setGraphicsContext(gc.get());
view->setCameraManipulator(new osgGA::TerrainManipulator);
}
// 第二个视图
{
osgViewer::View* view = new osgViewer::View;
view->setName("View two");
osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("osgDatas/cow.osgt");
viewer.addView(view);
view->setSceneData(scene);
view->getCamera()->setName("Cam two");
view->getCamera()->setViewport(new osg::Viewport(traits->width/2, traits->height/2, traits->width/2,traits->height/2));
view->getCamera()->setGraphicsContext(gc.get());
view->setCameraManipulator(new osgGA::TerrainManipulator);
}
// 第三个视图
{
osgViewer::View* view = new osgViewer::View;
view->setName("View one");
viewer.addView(view);
view->setSceneData(scene);
view->getCamera()->setName("Cam one");
view->getCamera()->setViewport(new osg::Viewport(0,0, traits->width/2, traits->height/2));
view->getCamera()->setGraphicsContext(gc.get());
osg::ref_ptr<osgGA::StateSetManipulator> statesetManipulator = new osgGA::StateSetManipulator;
statesetManipulator->setStateSet(view->getCamera()->getOrCreateStateSet());
view->setCameraManipulator(new osgGA::TerrainManipulator);
view->addEventHandler( statesetManipulator.get() );
view->addEventHandler( new osgViewer::StatsHandler );
view->addEventHandler( new osgViewer::HelpHandler );
view->addEventHandler( new osgViewer::WindowSizeHandler );
view->addEventHandler( new osgViewer::ThreadingHandler );
view->addEventHandler( new osgViewer::RecordCameraPathHandler );
}
// 第四个视图
{
osgViewer::View* view = new osgViewer::View;
view->setName("View one");
viewer.addView(view);
view->setSceneData(scene);
view->getCamera()->setName("Cam one");
view->getCamera()->setViewport(new osg::Viewport(traits->width/2, 0, traits->width/2,traits->height/2));
view->getCamera()->setGraphicsContext(gc.get());
// 添加状态操作器
osg::ref_ptr<osgGA::StateSetManipulator> statesetManipulator = new osgGA::StateSetManipulator;
statesetManipulator->setStateSet(view->getCamera()->getOrCreateStateSet());
view->setCameraManipulator(new osgGA::TerrainManipulator);
view->addEventHandler( statesetManipulator.get() );
view->addEventHandler( new osgViewer::StatsHandler );
view->addEventHandler( new osgViewer::HelpHandler );
view->addEventHandler( new osgViewer::WindowSizeHandler );
view->addEventHandler( new osgViewer::ThreadingHandler );
view->addEventHandler( new osgViewer::RecordCameraPathHandler );
}
四、效果
五、完整代码
#include <iostream>
#include <osgUtil/Optimizer>
#include <osgDB/ReadFile>
#include <osg/Material>
#include <osg/Geode>
#include <osg/BlendFunc>
#include <osg/Depth>
#include <osg/Projection>
#include <osg/PolygonOffset>
#include <osg/MatrixTransform>
#include <osg/Camera>
#include <osg/FrontFace>
#include <osgText/Text>
#include <osgGA/TerrainManipulator>
#include <osgGA/FlightManipulator>
#include <osgGA/StateSetManipulator>
#include <osgViewer/ViewerEventHandlers>
#include <osgViewer/CompositeViewer>
#include <osg/io_utils>
int main( int argc, char **argv )
{
//读取模型文件
osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("osgDatas/glider.osgt");
//创建CompositeViewer
osgViewer::CompositeViewer viewer;
if (viewer.getNumViews()==0)
{
osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();
if (!wsi)
{
osg::notify(osg::NOTICE)<<"Error, no WindowSystemInterface available, cannot create windows."<<std::endl;
return 1;
}
unsigned int width, height;
osg::GraphicsContext::ScreenIdentifier main_screen_id;
main_screen_id.readDISPLAY();
main_screen_id.setUndefinedScreenDetailsToDefaultScreen();
wsi->getScreenResolution(main_screen_id, width, height);
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
traits->x = 100;
traits->y = 100;
traits->width = 1000;
traits->height = 800;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->sharedContext = 0;
traits->readDISPLAY();
traits->setUndefinedScreenDetailsToDefaultScreen();
osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
// 第一个视图
{
osgViewer::View* view = new osgViewer::View;
osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("osgDatas/fountain.osgt");
view->setName("View three");
viewer.addView(view);
view->setSceneData(scene);
view->getCamera()->setName("Cam three");
view->getCamera()->setProjectionMatrixAsPerspective(30.0, double(traits->width) / double(traits->height/2), 1.0, 1000.0);
view->getCamera()->setViewport(new osg::Viewport(0, traits->height/2, traits->width/2,traits->height/2));
view->getCamera()->setGraphicsContext(gc.get());
view->setCameraManipulator(new osgGA::TerrainManipulator);
}
// 第二个视图
{
osgViewer::View* view = new osgViewer::View;
view->setName("View two");
osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("osgDatas/cow.osgt");
viewer.addView(view);
view->setSceneData(scene);
view->getCamera()->setName("Cam two");
view->getCamera()->setViewport(new osg::Viewport(traits->width/2, traits->height/2, traits->width/2,traits->height/2));
view->getCamera()->setGraphicsContext(gc.get());
view->setCameraManipulator(new osgGA::TerrainManipulator);
}
// 第三个视图
{
osgViewer::View* view = new osgViewer::View;
view->setName("View one");
viewer.addView(view);
view->setSceneData(scene);
view->getCamera()->setName("Cam one");
view->getCamera()->setViewport(new osg::Viewport(0,0, traits->width/2, traits->height/2));
view->getCamera()->setGraphicsContext(gc.get());
osg::ref_ptr<osgGA::StateSetManipulator> statesetManipulator = new osgGA::StateSetManipulator;
statesetManipulator->setStateSet(view->getCamera()->getOrCreateStateSet());
view->setCameraManipulator(new osgGA::TerrainManipulator);
view->addEventHandler( statesetManipulator.get() );
view->addEventHandler( new osgViewer::StatsHandler );
view->addEventHandler( new osgViewer::HelpHandler );
view->addEventHandler( new osgViewer::WindowSizeHandler );
view->addEventHandler( new osgViewer::ThreadingHandler );
view->addEventHandler( new osgViewer::RecordCameraPathHandler );
}
// 第四个视图
{
osgViewer::View* view = new osgViewer::View;
view->setName("View one");
viewer.addView(view);
view->setSceneData(scene);
view->getCamera()->setName("Cam one");
view->getCamera()->setViewport(new osg::Viewport(traits->width/2, 0, traits->width/2,traits->height/2));
view->getCamera()->setGraphicsContext(gc.get());
// add the state manipulator
osg::ref_ptr<osgGA::StateSetManipulator> statesetManipulator = new osgGA::StateSetManipulator;
statesetManipulator->setStateSet(view->getCamera()->getOrCreateStateSet());
view->setCameraManipulator(new osgGA::TerrainManipulator);
view->addEventHandler( statesetManipulator.get() );
view->addEventHandler( new osgViewer::StatsHandler );
view->addEventHandler( new osgViewer::HelpHandler );
view->addEventHandler( new osgViewer::WindowSizeHandler );
view->addEventHandler( new osgViewer::ThreadingHandler );
view->addEventHandler( new osgViewer::RecordCameraPathHandler );
}
}
return viewer.run();
}
边栏推荐
- [day 25] given an array of length N, count the number of occurrences of each number | count hash
- fatal: The upstream branch of your current branch does not match the name of your current branch.
- 物联网卡设备接入EasyCVR，如何查看拉流IP以及拉流时间？
- Startup process analysis of APP performance optimization
- Android AIDL：跨进程调用Service (AIDL Service)，kotlininvoke函数
- EasyCVR程序以服务启动异常，进程启动却正常，是什么原因？
- C语言：利用自定义函数排序
- Drag and drop report design - new features of jimureport 1.4.0
- 医疗是什么？AI医疗概念解析AI
- 逻辑的定义
猜你喜欢
DO280OpenShift访问控制--管理项目和账户
物联网卡设备接入EasyCVR，如何查看拉流IP以及拉流时间？
Solve the problem of project dependency red reporting
测试 - 用例篇 - 细节狂魔
如何入门机器学习？
Leetcode - linked list written test questions
UART protocol timing summary
小猫爪：PMSM之FOC控制15-MRAS法
The easycvr program started abnormally as a service, but the process started normally. What is the reason?
Dot and cross product
随机推荐
Android AIDL：跨进程调用Service (AIDL Service)，kotlininvoke函数
Interview notes for Android outsourcing workers for 3 years. I still need to go to a large factory to learn and improve. As an Android programmer
[image detection saliency map] calculation of fish eye saliency map based on MATLAB distortion prompt [including Matlab source code 1903]
Chaos engineering, learn about it
SQL Server 中 GO 的用法
kubernetes之常用核心资源对象
[technical grass planting] use the shared image function to realize the offline switching from CVM to LH
Batch renaming of images by MATLAB
Android App bundle exploration, client development interview questions
What is the use of AI technology in the medical field?
合成大西瓜小游戏微信小程序源码/微信游戏小程序源码
How to get started with machine learning?
Another short video app with high imitation and eye opening
微信小程序中three.js的canvas非全屏情况下射线检测不准确问题解决方案
Kubernetes basic concept
.NET 中的 Worker Service 介绍
Delegation attack of Intranet penetration and lateral mobility
[new cos series] | object storage cos data Vientiane CI processing special data processing resource package 4.5 folded into a big gift package!
重载（Overload）和重写（Override）的区别？
How to use data warehouse to create time series