OSG HUD Header Text display

Original: http://blog.csdn.net/tmljs1988/article/details/7562926

Can run

1. HUD Flowchart:

The complete source code is as follows:

/*OSG in the HUD, the text always appears in the front * *

#include <osgDB/ReadFile>

#include <osgViewer/Viewer>

#include <osg/Geode>

#include <osg/Depth>

#include <osg/CameraNode>

#include <osgText/Text>

#pragma comment (lib, "Osgd.lib"); The library names in the debug version plus D, such as "Osgd.lib"

#pragma comment (lib, "OsgDBd.lib")

#pragma comment (lib, "OsgViewerd.lib");

#pragma comment (lib, "OsgTextd.lib");

osg::node* Createhud ()

{

Text

osgtext::text* Text = new Osgtext::text;

Set font

std::string Caiyun ("Fonts/stcaiyun. TTF ");//The Chinese font is set here

Text->setfont (Caiyun);

Set the position of text display

OSG::VEC3 position (150.0f,500.0f,0.0f);

Text->setposition (position);

Text->setcolor (OSG::VEC4 (1, 1, 0, 1));

Text->settext (L "OSG China website www.osgChina.org");//Set the displayed text

Geometry node

osg::geode* Geode = new Osg::geode ();

Geode->adddrawable (text);//Add text text as this drawable to Geode node

Set status

osg::stateset* Stateset = Geode->getorcreatestateset ();

Stateset->setmode (Gl_lighting,osg::stateattribute::off);//Turn Off the lights

Stateset->setmode (Gl_depth_test,osg::stateattribute::off);//Close depth test

Turn on Gl_blend blending mode (to ensure the alpha texture is correct)

Stateset->setmode (Gl_blend,osg::stateattribute::on);

Camera

osg::camera* Camera = new Osg::camera;

Set Perspective matrix

Camera->setprojectionmatrix (osg::matrix::ortho2d (0,600,0,600));//orthogonal projection

Set the absolute reference coordinate system to ensure that the view matrix is not affected by the transformation matrix of the ancestor node

Camera->setreferenceframe (OSG::TRANSFORM::ABSOLUTE_RF);

The view matrix is the default

Camera->setviewmatrix (Osg::matrix::identity ());

Set the background to transparent, otherwise you can set the Clearcolor

Camera->setclearmask (Gl_depth_buffer_bit);

Camera->setalloweventfocus (false);//do not respond to events, always get the focus

Set the render order, which must be rendered at the end

Camera->setrenderorder (osg::cameranode::P ost_render);

Camera->addchild (Geode)//The Geode node to be displayed is added to the camera

return camera;

};

int main (int argc, char **argv)

{

Osgviewer::viewer Viewer;

Osg::ref_ptr<osg::node> model = Osgdb::readnodefile ("FOUNTAIN.OSG");

osg::ref_ptr<osg::group> root= New Osg::group;

Root->addchild (Model.get ());//Join a model

Root->addchild (Createhud ());//Add the camera of the HUD text to the root node

Viewer.setscenedata (Root.get ());

Viewer.realize ();

Viewer.run ();

return 0;

}

OSG HUD Header Text display