OSG添加图片结果纹理扭曲
在安卓端做加载天空盒的项目，用的代码是书中的例子，但是加载的纹理一直是扭曲的，求解答！谢谢大家！代码用的是PC端的，自己进行了相应的修改可以移植到安卓端，代码如下：osg::ref_ptr<osg::TextureCubeMap> readCubeMap()
{
osg::ref_ptr<osg::TextureCubeMap> cubemap = new osg::TextureCubeMap;
osg::ref_ptr<osg::Image> imagePosX = osgDB::readImageFile("right.jpg");
osg::ref_ptr<osg::Image> imageNegX = osgDB::readImageFile("left.jpg");
osg::ref_ptr<osg::Image> imagePosY = osgDB::readImageFile("front.jpg");
osg::ref_ptr<osg::Image> imageNegY = osgDB::readImageFile("back.jpg");
osg::ref_ptr<osg::Image> imagePosZ = osgDB::readImageFile("up.jpg");
osg::ref_ptr<osg::Image> imageNegZ = osgDB::readImageFile("down.jpg");
if (imagePosX.get() && imageNegX.get() && imagePosY.get() && imageNegY.get() && imagePosZ.get() && imageNegZ.get())
{
//设置立方图的六个面的贴图
cubemap->setImage(osg::TextureCubeMap::POSITIVE_X, imagePosX.get());
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_X, imageNegX.get());
cubemap->setImage(osg::TextureCubeMap::POSITIVE_Y, imagePosY.get());
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Y, imageNegY.get());
cubemap->setImage(osg::TextureCubeMap::POSITIVE_Z, imagePosZ.get());
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Z, imageNegZ.get());
//设置纹理环绕模式
cubemap->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
cubemap->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
cubemap->setWrap(osg::Texture::WRAP_R, osg::Texture::CLAMP_TO_EDGE);
//设置滤波：线形和mipmap
cubemap->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR_MIPMAP_LINEAR);
cubemap->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
}
return cubemap.get();
}
//更新立方体图纹理
struct TexMatCallback : public osg::NodeCallback
{
public:
TexMatCallback(osg::TexMat& tm) :
_texMat(tm)
{
//
}
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
if (cv)
{
//得到模型视图矩阵并设置旋转角度
const osg::Matrix& MV = *(cv->getModelViewMatrix());
const osg::Matrix R = osg::Matrix::rotate( osg::DegreesToRadians(112.0f), 0.0f,0.0f,1.0f)*
osg::Matrix::rotate( osg::DegreesToRadians(90.0f), 1.0f,0.0f,0.0f);
osg::Quat q = MV.getRotate();
const osg::Matrix C = osg::Matrix::rotate( q.inverse() );
//设置纹理矩阵
_texMat.setMatrix( C*R );
}
traverse(node,nv);
}
//纹理矩阵
osg::TexMat& _texMat;
};
//一个变换类，使天空盒绕视点旋转
class MoveEarthySkyWithEyePointTransform : public osg::Transform
{
public:
//局部矩阵计算成世界矩阵
virtual bool computeLocalToWorldMatrix(osg::Matrix& matrix,osg::NodeVisitor* nv) const
{
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
if (cv)
{
osg::Vec3 eyePointLocal = cv->getEyeLocal();
matrix.preMult(osg::Matrix::translate(eyePointLocal));
}
return true;
}
//世界矩阵计算为局部矩阵
virtual bool computeWorldToLocalMatrix(osg::Matrix& matrix,osg::NodeVisitor* nv) const
{
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
if (cv)
{
osg::Vec3 eyePointLocal = cv->getEyeLocal();
matrix.postMult(osg::Matrix::translate(-eyePointLocal));
}
return true;
}
};
//创建天空盒
osg::ref_ptr<osg::Node> createSkyBox()
{
osg::ref_ptr<osg::StateSet> stateset = new osg::StateSet();
//设置纹理映射方式，指定为替代方式，即纹理中的颜色代替原来的颜色
osg::ref_ptr<osg::TexEnv> te = new osg::TexEnv;//覆盖方式
te->setMode(osg::TexEnv::REPLACE);
stateset->setTextureAttributeAndModes(0, te.get(), osg::StateAttribute::ON| osg::StateAttribute::OVERRIDE);
//自动生成纹理坐标，反射方式(REFLECTION_MAP)
/*
NORMAL_MAP 标准模式－立方图纹理
REFLECTION_MAP 反射模式－球体纹理
SPHERE_MAP 球体模型－球体纹理
*/
osg::ref_ptr<osg::TexGen> tg = new osg::TexGen;
tg->setMode(osg::TexGen::NORMAL_MAP);
stateset->setTextureAttributeAndModes(0, tg.get(), osg::StateAttribute::ON| osg::StateAttribute::OVERRIDE);
//设置纹理矩阵
osg::ref_ptr<osg::TexMat> tm = new osg::TexMat;
stateset->setTextureAttribute(0, tm.get());
//设置立方图纹理
osg::ref_ptr<osg::TextureCubeMap> skymap = readCubeMap();
stateset->setTextureAttributeAndModes(0, skymap.get(), osg::StateAttribute::ON| osg::StateAttribute::OVERRIDE);
stateset->setMode( GL_LIGHTING, osg::StateAttribute::OFF );
stateset->setMode( GL_CULL_FACE, osg::StateAttribute::OFF );
//将深度设置为远平面
osg::ref_ptr<osg::Depth> depth = new osg::Depth;
depth->setFunction(osg::Depth::ALWAYS);
depth->setRange(1.0,1.0);//远平面
stateset->setAttributeAndModes(depth, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
//设置渲染顺序为-1，先渲染
stateset->setRenderBinDetails(-1,"RenderBin");
osg::ref_ptr<osg::Drawable> drawable = new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0.0f,0.0f,0.0f),1));
//把球体加入到叶节点
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
geode->setCullingActive(false);
geode->setStateSet( stateset.get());
geode->addDrawable(drawable.get());
//设置变换
//osg::ref_ptr<osg::Transform> transform = new MoveEarthySkyWithEyePointTransform();
//transform->setCullingActive(false);
//transform->addChild(geode.get());
//osg::ref_ptr<osg::ClearNode> clearNode = new osg::ClearNode;
//clearNode->setCullCallback(new TexMatCallback(*tm));
//clearNode->addChild(transform.get());
return geode.get();
}
int main()
{
osg::ref_ptr<osgViewer::Viewer> viewer= new osgViewer::Viewer();
osg::ref_ptr<osg::Group> rootnode = new osg::Group();
//加入天空盒
rootnode->addChild(createSkyBox());
//优化场景数据
osgUtil::Optimizer optimzer;
optimzer.optimize(rootnode.get());
viewer->setSceneData(rootnode.get());
viewer->realize();
viewer->run();
return 0 ;
}
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