osg入门系列4- 分页细节层次节点

最新推荐文章于 2024-02-03 01:05:12 发布

原创最新推荐文章于 2024-02-03 01:05:12 发布 · 3.3k 阅读

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CC 4.0 BY-SA版权

本文介绍如何使用OpenSceneGraph库创建并优化PagedLOD场景，包括加载多个模型文件、设置范围和优化性能。

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#include <iostream>

#include <osgViewer/Viewer>

#include <osg/Node>
#include <osg/Geode>
#include <osg/Group>
#include <osg/PagedLOD>

#include <osg/PositionAttitudeTransform>
#include <osg/MatrixTransform>

#include <osgDB/ReadFile>
#include <osgDB/WriteFile>

#include <osgGA/TrackballManipulator>

#include <osgUtil/Optimizer>

using namespace std;

osg::ref_ptr<osg::Group> createPagedLOD()
{
    osg::ref_ptr<osg::PagedLOD> page = new osg::PagedLOD();
    page->setCenter(osg::Vec3(0.0f, 0.0f, 0.0f));

    page->setFileName(0, "/home/zhaogang/work/thirdparty/OpenSceneGraph-3.2.1/data/cow.osg");
    page->setRange(0, 0.0f, 50.0f);

    page->setFileName(1, "/home/zhaogang/work/thirdparty/OpenSceneGraph-3.2.1/data/glider.osg");
    page->setRange(1, 50.0f, 100.0f);

    page->setFileName(2, "/home/zhaogang/work/thirdparty/OpenSceneGraph-3.2.1/data/cessna.osg");
    page->setRange(2, 100.0f ,200.0f);

    return page.get();
}

int main()
{
    osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();
    osg::ref_ptr<osg::Group> root = new osg::Group();

    osg::ref_ptr<osg::MatrixTransform> mt = new osg::MatrixTransform();
    mt->addChild(createPagedLOD());
    osg::Matrix m;
    m.makeRotate(60.0f, 0.0f, 0.0f, 1.0f);

    mt->setMatrix(m);

    root->addChild(mt.get());

    osgDB::writeNodeFile(*root, "page.osg");

    osgUtil::Optimizer optimizer;
    optimizer.optimize(root.get());

    viewer->setSceneData(root.get());

    viewer->realize();

    viewer->run();

    return 0;
}

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TEMPLATE = app
CONFIG += console
CONFIG -= qt

SOURCES += main.cpp

LIBS += -L/usr/local/lib/
LIBS += -lOpenThreads
LIBS += -losg
LIBS += -losgDB
LIBS += -losgFX
LIBS += -losgGA
LIBS += -losgManipulator
LIBS += -losgParticle
LIBS += -losgShadow
LIBS += -losgSim
LIBS += -losgTerrain
LIBS += -losgText
LIBS += -losgUtil
LIBS += -losgViewer

----