osg替换物体贴图

#include <osgViewer/Viewer>
#include <osg/Node>
#include <osg/Geometry>
#include <osg/Geode>
#include <osg/Group>
#include <osg/Texture2D>
#include <osg/TexEnv>
#include <osg/TexGen>

#include <osgDB/ReadFile>
#include <osgDB/WriteFile>

#include <osgUtil/Optimizer>

int main()
{
    osg::ref_ptr<osgViewer::Viewer> viewer=new osgViewer::Viewer;
    osg::ref_ptr<osg::Group> root=new osg::Group;

    osg::ref_ptr<osg::Node> node=osgDB::readNodeFile("D:\\my work\\aerolite\\aerolite-0.10\\bin\\cow.osg");

    osg::ref_ptr<osg::Image> image=osgDB::readImageFile("D:\\");

    if (image.get())
    {
        //创建二维纹理
        osg::ref_ptr<osg::Texture2D> texture=new osg::Texture2D;
        texture->setImage(image.get());

        //设置自动生成坐标
        osg::ref_ptr<osg::TexGen> texgen=new osg::TexGen;
        texgen->setMode(osg::TexGen::SPHERE_MAP);

        //设置纹理环境
        osg::ref_ptr<osg::TexEnv> texenv=new osg::TexEnv;
        texenv->setMode(osg::TexEnv::REPLACE);//替换物体贴图

        //设置blend操作颜色
        texenv->setColor(osg::Vec4(0.6,0.6,0.6,0.0));

        //启用单元一自动生成纹理坐标，并使用纹理

        osg::ref_ptr<osg::StateSet> stateset=new osg::StateSet;
        stateset->setTextureAttributeAndModes(1,texture.get(),osg::StateAttribute::ON);
        stateset->setTextureAttributeAndModes(1,texgen.get(),osg::StateAttribute::ON);

        //设置纹理环境
        stateset->setTextureAttribute(1,texenv.get());

        //设置物体状态
        node->setStateSet(stateset.get());
    }

    root->addChild(node.get());

    viewer->setSceneData(root.get());

    viewer->realize();

    viewer->run();

    return 0;
}