Thank you very much, but this method only works for four point texture 
coordinates  

在2021年1月19日星期二 UTC+8 下午10:32:48<l.vo...@rug.nl> 写道:

> This should do a 180 rotation:
> image->flipVertical();
> image->flipHorizontal();
> Laurens.
>
>
> On Tue, Jan 19, 2021 at 1:21 PM mirr...@gmail.com <mirr...@gmail.com> 
> wrote:
>
>> win10  gtx1080  osg3.6.4 
>>
>> osg::ref_ptr<osg::Image> image =
>>     osgDB::readImageFile( "picture.bmp" );
>> osg::ref_ptr<osg::Texture2D> texture = new osg::Texture2D;
>> texture->setImage( image.get() );
>>
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