懂OSG的请进！关于贴图纹理的问题！

[麻菜]

//这是OSG画矩形并贴上纹理图片的函数
osg::ref_ptr<osg::Node> setTex(const std::string& filename)
{
	osg::Group* group = new osg::Group;
	osg::Geometry* geom = new osg::Geometry;

	osg::Vec3Array* vertices = new osg::Vec3Array(4);
	vertices->push_back(osg::Vec3(0,0,0));
	vertices->push_back(osg::Vec3(0,0,1));
	vertices->push_back(osg::Vec3(1,0,1));
	vertices->push_back(osg::Vec3(1,0,0));
	geom->setVertexArray(vertices);

	osg::Vec2Array* texcoords = new osg::Vec2Array(4);
	texcoords->push_back(osg::Vec2(0.0f,0.0f));
	texcoords->push_back(osg::Vec2(1.0f,0.0f));
	texcoords->push_back(osg::Vec2(1.0f,1.0f));
	texcoords->push_back(osg::Vec2(0.0f,1.0f));

	//(*texcoords)[0].set(0.0f,0.0f);
	//(*texcoords)[1].set(1.0f,0.0f);
	//(*texcoords)[2].set(1.0f,1.0f);
	//(*texcoords)[3].set(0.0f,1.0f);
	geom->setTexCoordArray(0,texcoords);

	//osg::Vec3Array* normals = new osg::Vec3Array(1);
	//(*normals)[0].set(-1.0f,0.0f,0.0f);
	//geom->setNormalArray(normals);
	//geom->setNormalBinding(osg::Geometry::BIND_OVERALL);

	//osg::Vec4Array* colors = new osg::Vec4Array(1);
	//(*colors)[0].set(1.0f,1.0f,1.0f,1.0f);
	//geom->setColorArray(colors);
	//geom->setColorBinding(osg::Geometry::BIND_OVERALL);

	geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP,0,4));

	// set up the texture state.    
	osg::Texture2D* texture = new osg::Texture2D;
	texture->setDataVariance(osg::Object::DYNAMIC); // protect from being optimized away as static state.
	//texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
	//texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
	//texture->setBorderColor(osg::Vec4(1.0f,1.0f,1.0f,0.5f)); // only used when wrap is set to CLAMP_TO_BORDER
	texture->setImage(osgDB::readImageFile(filename));

	osg::StateSet* stateset = geom->getOrCreateStateSet();
	stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
	stateset->setMode(GL_BLEND,osg::StateAttribute::ON);
	stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);

	osg::Geode* geode = new osg::Geode;
	geode->addDrawable(geom);
	group->addChild(geode);

	return group;
}

//mian()
int main(int argc, char* argv[])
{
	osgViewer::Viewer viewer; 
	osg::Group * root = new osg::Group(); 

	root->addChild(setTex("forestRoof.png").get());
	viewer.setSceneData(root); 

	viewer.run(); 
	return 0;
}

VS2008 SP1 ，XP ，OSG2.9.8
问题是贴不上贴图纹理。请大牛解析一下。谢谢！

[麻菜]

//我自己解决问题了！
原来是这里的问题

    osg::Vec3Array* vertices = new osg::Vec3Array(4);//这里已经初始化了4个顶点
    //后边再push_back四个顶，结果有8个顶点了
    //应该是：osg::Vec3Array* vertices = new osg::Vec3Array;
    vertices->push_back(osg::Vec3(0,0,0));
    vertices->push_back(osg::Vec3(0,0,1));
    vertices->push_back(osg::Vec3(1,0,1));
    vertices->push_back(osg::Vec3(1,0,0));
    geom->setVertexArray(vertices);
 
    osg::Vec2Array* texcoords = new osg::Vec2Array(4);//这里也同上。
    texcoords->push_back(osg::Vec2(0.0f,0.0f));
    texcoords->push_back(osg::Vec2(1.0f,0.0f));
    texcoords->push_back(osg::Vec2(1.0f,1.0f));
    texcoords->push_back(osg::Vec2(0.0f,1.0f));

========
问题解决了！自己结帖……

[hhh_hao]

有关OSG的问题, 可以去OSG中国论坛,

http://bbs.osgchina.org/

[ryfdizuo]

osg例子程序已经很多了。
jf~