[osg-users] How to render the image without reducing its size.?

[Christian Buchner]

Your OpenGL implementation might signal a maximum texture size of 4096.

Which is why there is no alternative to downsizing it.

There is also an OSG_MAX_TEXTURE_SIZE environment variable. I am not sure
what its default value is, or if it has a default at all. Have you tried
forcing this to 8192?

Christian



2016-11-22 13:58 GMT+01:00 Uma Devi Selvaraj <umaselvam1503 at gmail.com>:

> Hi,
>
>    I have simple code that renders image using osgviewer. I am able to
> render the image successfully with the code. My problem now is the size of
> the image is reduced. for example the original size of the image is 4683 *
> 3035, the image is reduced to 4096 * 3035. Is this expected behaviour or is
> there anything I need to add in my code. I have added my code.
>
>
> //required header files
>
> int main(int argc,char**argv)
> {
>
>         osg::ref_ptr<osg::Image> image;
>     image = osgDB::readImageFile("C:\\Users\\mcw\\Desktop\\DemModel.
> tif.gdal");
>         std::cout << "Image info are " << image->s() << "\n" <<image->t()
> <<"\n" <<image->r() << std::endl;
>         if (!(image.valid()))
>         {
>                 std::cout << "Unable to read image file " << std::endl;
>                 getchar();
>                 return 0;
>         }
>
>         osg::ref_ptr<osg::Geode> geode =(osg::createGeodeForImage(image));
>
>         osg::Texture2D *texture = new osg::Texture2D();
>         texture->setFilter(osg::Texture::MIN_FILTER,
> osg::Texture::LINEAR);
>         texture->setFilter(osg::Texture::MAG_FILTER,
> osg::Texture::LINEAR);
>         texture->setWrap(osg::Texture::WRAP_R, osg::Texture::REPEAT);
>         texture->setResizeNonPowerOfTwoHint(false);
>         texture->setImage(image);
>         texture->setBorderColor(osg::Vec4d(0.4f, 0.5f, 0.6f, 1.0f));
>         osg::StateSet* stateset = new osg::StateSet;
>
>         stateset->setTextureAttributeAndModes(0, texture,
> osg::StateAttribute::ON);
>
>         geode->setStateSet(stateset);
>         osgViewer::Viewer viewer;
>         viewer.setSceneData(geode.get());
>         getchar();
>         return viewer.run();
>
> }
>
> ...
>
> Thank you!
>
> Cheers,
> Uma
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=69470#69470
>
>
>
>
>
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