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osg::Geode类表示场景中的渲染几何叶节点，它包含了渲染用的几何信息，没有子节点。
要绘制的几何数据保存在osg::Geode管理的一组osg::Drawable对象中。osg::Drawable是一个接口，它有很多实现类渲染模型，图像，文本到OpenGL管线。这些可渲染统称为drawables.
osg::Geode提供了几个方法来绑定和解绑drawables:
osg::ShapeDrawable继承自osg::Drawable。
setShape()方法通常分配和设置一个模型shape，如:
shapeDrawable->setShape( new osg::Box(osg::Vec3(1.0f, 0.0f, 0.0f), 10.0f, 10.0f, 5.0f) );
#include <osg/ShapeDrawable> #include <osg/Geode> #include <osgViewer/Viewer> int main(int argc, char **argv) { osg::ref_ptr<osg::ShapeDrawable> shape1 = new osg::ShapeDrawable; shape1->setShape(new osg::Box(osg::Vec3(-3.0f, 0.0f, 0.0f), 2.0f, 2.0f, 1.0f)); osg::ref_ptr<osg::ShapeDrawable> shape2 = new osg::ShapeDrawable; shape2->setShape(new osg::Sphere(osg::Vec3(3.0f, 0.0f, 0.0f), 1.0f)); shape2->setColor(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f)); osg::ref_ptr<osg::ShapeDrawable> shape3 = new osg::ShapeDrawable; shape3->setShape(new osg::Cone(osg::Vec3(0.0f, 0.0f, 0.0f), 1.0f, 1.0f)); shape3->setColor(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f)); osg::ref_ptr<osg::Geode> root = new osg::Geode; root->addDrawable(shape1.get()); root->addDrawable(shape2.get()); root->addDrawable(shape3.get()); osgViewer::Viewer viewer; viewer.setSceneData(root.get()); return viewer.run(); }
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原文地址：http://www.cnblogs.com/yaoyu126/p/5762145.html
