[osg-users] writeNode after readNode makes the osgb model much bigger size

[Julien Valentin]

Hi Tangrijing

You may use osgDB::writeNode(*node, “456.osgb.zip”,options);
or try store Images as external compressed ive

Cheers


jane_rita wrote:
> Hi,
> 
> I read 123.osgb file to a node, and then write it to 456.osgb ,however,the 456.osgb has a 10 times bigger size than 123.osgb. My code is here:
> 
> osg::ref_ptr<osg::Node> node = osgDB::readRefNodeFile(123.osgb);
> 
> osg::ref_ptr<osgDB::ReaderWriter::Options> options = new osgDB::ReaderWriter::Options;
> options->setOptionString("WriteImageHint=IncludeData");
> 
> osgDB::ReaderWriter::WriteResult result = osgDB::Registry::instance()->writeNode(*node, “456.osgb”,options);
> 
> 
> I than use a  texure compress method cited from osgconv.cpp, the result is still 2 times bigger size than the original file.
> 
> 
> void MyNodeVisitor::compress()
> {
>         MyGraphicsContext context;
>         if (!context.valid())
>         {
>                 osg::notify(osg::NOTICE) << "Error: Unable to create graphis context, problem with running osgViewer-" << osgViewerGetVersion() << ", cannot run compression." << std::endl;
>                 return;
>         }
> 
>         osg::ref_ptr<osg::State> state = new osg::State;
>         state->initializeExtensionProcs();
> 
>         for (TextureSet::iterator itr = _textureSet.begin();
>                 itr != _textureSet.end();
>                 ++itr)
>         {
>                 osg::Texture* texture = const_cast<osg::Texture*>(itr->get());
> 
>                 osg::Texture2D* texture2D = dynamic_cast<osg::Texture2D*>(texture);
>                 osg::Texture3D* texture3D = dynamic_cast<osg::Texture3D*>(texture);
> 
>                 osg::ref_ptr<osg::Image> image = texture2D ? texture2D->getImage() : (texture3D ? texture3D->getImage() : 0);
>                 if (image.valid() &&
>                         (image->getPixelFormat() == GL_RGB || image->getPixelFormat() == GL_RGBA) &&
>                         (image->s() >= 32 && image->t() >= 32))
>                 {
>                         texture->setInternalFormatMode(_internalFormatMode);
> 
>                         // need to disable the unref after apply, otherwise the image could go out of scope.
>                         bool unrefImageDataAfterApply = texture->getUnRefImageDataAfterApply();
>                         texture->setUnRefImageDataAfterApply(false);
> 
>                         // get OpenGL driver to create texture from image.
>                         texture->apply(*state);
> 
>                         // restore the original setting
>                         texture->setUnRefImageDataAfterApply(unrefImageDataAfterApply);
> 
>                         image->readImageFromCurrentTexture(0, true);
> 
>                         texture->setInternalFormatMode(osg::Texture::USE_IMAGE_DATA_FORMAT);
>                 }
>         }
> }
> 
> 
> 
> my question is ,how can i make the 456.osgb has the same size with 123.osgb
> 
> Thank you!
> 
> Cheers,
> tangrijing


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