osg加载模型提高速度参考办法
提高加载速度几种方法：1，精简模型；
2，精简纹理图片，图像尺寸改为2的N次方；
3，异步加载； 本帖最后由 liyihongcug 于 2020-3-14 16:14 编辑
上自动平面裁剪避免遮挡：
添加头文件
#include <osgEarthUtil/AutoClipPlaneHandler>
在main函数中添加
//加上自动裁剪。否则显示会出现遮挡
viewer->getCamera()->addCullCallback(new osgEarth::Util::AutoClipPlaneCullCallback(mapNode));
osgearth关于近地面Camera远近裁剪面的设置
视点接近地面时，由于默认的近裁剪面near太大，导致看不见靠近摄像机的物体，这时需要重新调节near和far的值（或者near/far的比率），可以使用osgEarth::Util::AutoClipPlaneCullCallback(osgEarth::MapNode* mapNode)
例如：
osgViewer::Viewer viewer;
viewer.getCamera()->addCullCallback( new osgEarth::Util::AutoClipPlaneCullCallback(mapNode) );
osgEarth::Picker pick(view, view->getSceneData());
osgEarth::Picker::Hits hits;
if (pick.pick(x,y,hits))
{
for(osgEarth::Picker::Hits::iterator hit = hits.begin(); hit != hits.end(); ++hit )
{
//这里转成你需要的类型
osgEarth::Annotation::FeatureNode* node = pick.getNode<osgEarth::Annotation::FeatureNode>(*hit);
if (node)
{ 业务逻辑 }
}
Using osgEarth 2.7, I'm trying to apply RTTPicker to a PlaceNode, which has an icon and a text label. For the icon, this works fine, and I get the correct ObjectID. But the text for some reason returns its own color as the ID. See the following code. Here 0x600dc0de is the ID I would expect from RTTPicker for the whole PlaceNode. But instead for text, whose color I set to 0xbadc0de1, the ID appears equal to this 0xbadc0de1.
What am I doing wrong?
#include <QDir>
#include <iostream>
#include <QMainWindow>
#include <QApplication>
#include <QTemporaryFile>
#include <osgEarth/Registry>
#include <osgEarth/ObjectIndex>
#include <osgEarthUtil/RTTPicker>
#include <osgEarthQt/ViewerWidget>
#include <osgEarthAnnotation/PlaceNode>
#include <osgEarthUtil/EarthManipulator>
class DemoMainWindow : public QMainWindow
{
public:
DemoMainWindow(osgEarth::MapNode* mapNode, osgViewer::Viewer* viewer)
{
using namespace osgEarth::Annotation;
setCentralWidget(new osgEarth::QtGui::ViewerWidget(viewer));
const auto pNode=new PlaceNode(mapNode, osgEarth::GeoPoint(mapNode->getMapSRS(), 37, 55, 0),
"Icon on map");
mapNode->addChild(pNode);
auto style=pNode->getStyle();
style.getOrCreateSymbol<TextSymbol>()->fill()->color()=osg::Vec4(0xba,0xdc,0x0d,0xe1)/255.;
pNode->setStyle(style);
pNode->setIconImage(osgDB::readImageFile("/usr/share/icons/hicolor/32x32/apps/firefox.png"));
pNode->getOrCreateStateSet()->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
const osgEarth::ObjectID id=0x600dc0de;
osgEarth::Registry::objectIndex()->tagNode(pNode,id);
}
};
struct MyPickCallback : public osgEarth::Util::RTTPicker::Callback
{
void onHit(osgEarth::ObjectID id) override
{
std::cerr << "onHit, id: " << std::hex << id << std::dec << "\n";
}
bool accept(const osgGA::GUIEventAdapter& ea, const osgGA::GUIActionAdapter&) override
{
return ea.getEventType() == ea.MOVE;
}
};
int main(int argc, char** argv)
{
using namespace osgEarth::Util;
QApplication app(argc, argv);
osg::setNotifyLevel(osg::WARN);
osgEarth::setNotifyLevel(osg::WARN);
QTemporaryFile earthFile(QDir::tempPath()+QDir::separator()+"XXXXXX.earth");
earthFile.open();
earthFile.write("<map><options><terrain><color>#555555ff</color></terrain></options></map>");
earthFile.close();
const auto earthNode = osgDB::readNodeFile(earthFile.fileName().toStdString());
if(!earthNode)
{
OE_WARN << "Unable to load earth model \"" << earthFile.fileName().toStdString() << "\"\n";
return EXIT_FAILURE;
}
const auto viewer = new osgViewer::Viewer;
viewer->setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
viewer->setSceneData(earthNode);
const auto windowSize=300;
osgEarth::Util::RTTPicker* picker = new osgEarth::Util::RTTPicker(windowSize);
viewer->addEventHandler(picker);
picker->setDefaultCallback(new MyPickCallback());
const auto mapNode = osgEarth::MapNode::findMapNode(earthNode);
picker->addChild(mapNode);
DemoMainWindow appWin(mapNode, viewer);
appWin.resize(windowSize,windowSize);
const auto manip = new osgEarth::Util::EarthManipulator;
viewer->setCameraManipulator(manip, 2.);
manip->setViewpoint(osgEarth::Viewpoint("CameraCenter", 37, 55, 0, 0.0, -90.0, 300000));
appWin.show();
return app.exec();
}
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