[osg-users] [osgPlugins] osgPlugins ReaderWriterRGB

[Ming Lu]

Hi,

I am trying to export the textures in osgb file into pic file. therefore i used ReaderWriterRGB:


>
> osg::StateSet::TextureAttributeList osg_texture_attribute_list = osg_state->getTextureAttributeList();
>
> unsigned int texture_list_index = 0;
> for (; texture_list_index < osg_texture_attribute_list.size(); ++texture_list_index) {
>
> osg::Texture2D* texture = (osg::Texture2D*)(osg_state->getTextureAttribute(texture_list_index, osg::StateAttribute::TEXTURE));
>
> if (texture) {
> const osg::Image* image = texture->getImage();
> if (image) {
> if (!osgDB::writeImageFile(*image, image->getFileName())) {
> BOOST_LOG_TRIVIAL(error) << "Write image failed";
> }
>


But i got this exception:
> Warning: RGB plugin does not supporting writing compressed imagery.


my question is: how could i export the compressed texture image into a file?

Thank you!

Cheers,
Ming
>


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[Ming Lu]

I found a interesting solution:


Code:

std::string texture_file_name =
osgDB::getStrippedName(image->getFileName());
texture_file_name += ".dds";
image->setFileName(texture_file_name);
osgDB::writeImageFile(*image, image->getFileName()




actually i just changed file extent name from rgb to dds...and it works...i get a lot dds file on disk...

I still don't get it...how it works...

maybe can somebody help me out to get a right way export compressed texture to file... :O

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Read this topic online here:

http://forum.openscenegraph.org/viewtopic.php?p=67629#67629

[Robert Osfield]

Hi Ming,

Changing the file extension from .rgb (Which doesn't support
compressed textures) to .dds (which does) is the perfect solution in
your case. .dds is a much more complete image file format for modern
graphics needs - it supports compression and mipmapping, while the old
.rgb format is ancient and only supports non mip-mapped non compressed
images.

Robert.

[Ming Lu]

Hi Robert,

thanks for reply!
Perfect.
I will take dds. :) :P
as experiment i used bmp format. files could be created but doesn't look correctly.
when i get your opinion correctly: dds is only supported format for compressed texture?

Best
Ming

robertosfield wrote:
> Hi Ming,
>
> Changing the file extension from .rgb (Which doesn't support
> compressed textures) to .dds (which does) is the perfect solution in
> your case. .dds is a much more complete image file format for modern
> graphics needs - it supports compression and mipmapping, while the old
> .rgb format is ancient and only supports non mip-mapped non compressed
> images.
>
> Robert.
>

> On 15 June 2016 at 08:50, Ming Lu <> wrote:
>
> > I found a interesting solution:
> >
> >
> > Code:
> >
> > std::string texture_file_name =
> > osgDB::getStrippedName(image->getFileName());
> > texture_file_name += ".dds";
> > image->setFileName(texture_file_name);
> > osgDB::writeImageFile(*image, image->getFileName()
> >
> >
> >
> >
> > actually i just changed file extent name from rgb to dds...and it works...i get a lot dds file on disk...
> >
> > I still don't get it...how it works...
> >
> > maybe can somebody help me out to get a right way export compressed texture to file... :O
> >

> > ------------------
> > Read this topic online here:

> > http://forum.openscenegraph.org/viewtopic.php?p=67629#67629
> >
> >
> >
> >
> >
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> > osg-users mailing list
> >

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> >
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