osg demo11 draw shapes

//DEMO11 绘制基本几何图形


#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
#include <osg/Node>
#include <osg/Geode>
#include <osg/Geometry>
#include <osg/Shape>
#include <osg/ShapeDrawable>


osg::ref_ptr<osg::Node> createShape();


void main()
{
osgViewer::Viewer viewer;
osg::Group *root = new osg::Group();
root->addChild(createShape().get());
viewer.setSceneData(root);
viewer.realize();
viewer.run();
}


osg::ref_ptr<osg::Node> createShape()
{
osg::ref_ptr<osg::Geode> geode = new osg::Geode;


float radius = 0.1f;
float height = 0.1f;


osg::TessellationHints *hints = new osg::TessellationHints;
hints->setDetailRatio(0.5f);


geode->addDrawable(new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0.0f,0.0f,0.0f),radius),hints));
geode->addDrawable(new osg::ShapeDrawable(new osg::Box(osg::Vec3(0.2f,0.0f,0.0f),2*radius),hints));
geode->addDrawable(new osg::ShapeDrawable(new osg::Cone(osg::Vec3(0.4f,0.0f,0.0f),radius,height),hints));
geode->addDrawable(new osg::ShapeDrawable(new osg::Cylinder(osg::Vec3(0.6f,0.0f,0.0f),radius,height),hints));
geode->addDrawable(new osg::ShapeDrawable(new osg::Capsule(osg::Vec3(0.8f,0.0f,0.0f),radius,height),hints));


return geode.get();
}