OSG学习：多重纹理映射

#include<osgViewer\Viewer>

#include<osg\Node>
#include<osg\Geode>
#include<osg\Geometry>
#include<osg\Texture2D>
#include<osg\TexGen>
#include<osg\TexEnv>

#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("cow.osg");

	//读取贴图
	osg::ref_ptr<osg::Image> image = osgDB::readImageFile("Images/primitives.gif");

	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);

		//设置文理环境，模式为BLEND
		osg::ref_ptr<osg::TexEnv> texenv = new osg::TexEnv;
		texenv->setMode(osg::TexEnv::BLEND);
		//设置BLEND操作的颜色
		texenv->setColor(osg::Vec4(0.6f, 0.6f, 0.6f, 0.0f));

		//启用单元1自动生成文理坐标，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());
	}

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

	//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：