OSG学习:使用OSG中预定义的几何体
常用的内嵌几何体包括:
osg::Box //正方体
osg::Capsule //太空舱
osg::Cone //椎体
osg::Cylinder //柱体
osg::HeightField //高度图
osg::InfinitePlane //无限平面
osg::Sphere //球体
osg::TriangleMesh //三角片
以下是代码示例:
/**********************************************************
*Write by FlySky
*zzuxp@163.com http://www.OsgChina.org
**********************************************************/
#include <osgViewer/Viewer>
#include <osg/Node>
#include <osg/Geode>
#include <osg/Group>
#include <osg/ShapeDrawable>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include <osgUtil/Optimizer>
//绘制多个预定义的几何体
osg::ref_ptr<osg::Geode> createShape()
{
//创建一个叶节点
osg::ref_ptr<osg::Geode> geode = new osg::Geode();
//设置半径和高度
float radius = 0.8f;
float height = 1.0f;
//创建精细度对象,精细度越高,细分就越多
osg::ref_ptr<osg::TessellationHints> hints = new osg::TessellationHints;
//设置精细度为0.5f
hints->setDetailRatio(0.5f);
//添加一个球体,第一个参数是预定义几何体对象,第二个是精细度,默认为0
geode->addDrawable(new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0.0f,0.0f,0.0f),radius),hints.get()));
//添加一个正方体
geode->addDrawable(new osg::ShapeDrawable(new osg::Box(osg::Vec3(2.0f,0.0f,0.0f),2*radius),hints.get()));
//添加一个圆锥
geode->addDrawable(new osg::ShapeDrawable(new osg::Cone(osg::Vec3(4.0f,0.0f,0.0f),radius,height),hints.get()));
//添加一个圆柱体
geode->addDrawable(new osg::ShapeDrawable(new osg::Cylinder(osg::Vec3(6.0f,0.0f,0.0f),radius,height),hints.get()));
//添加一个太空舱
geode->addDrawable(new osg::ShapeDrawable(new osg::Capsule(osg::Vec3(8.0f,0.0f,0.0f),radius,height),hints.get()));
return geode.get() ;
}
int main()
{
//创建Viewer对象,场景浏览器
osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();
osg::ref_ptr<osg::Group> root = new osg::Group();
//添加到场景
root->addChild(createShape());
//优化场景数据
osgUtil::Optimizer optimizer ;
optimizer.optimize(root.get()) ;
viewer->setSceneData(root.get());
viewer->realize();
viewer->run();
return 0 ;
}
结果图: