[osg-users] problem setting texture min/mag filter

[Robert Osfield]

HI Antiro,

You code looks fine, there isn't anything else you need to do to set
up filter modes.

I haven't heard of issues with setting the filter modes so would
expect it to work. Perhaps what is amiss is either something higher up
- such as the texture not being used in the subgraph that you think it
is being used - or that the filtering is working and you are just
mis-interpreting the results.

Robert.

On 12 February 2018 at 07:51, antiro black <antiro42 at gmail.com> wrote:
> Hi,
>
> I'm trying to use a texture to get some data to a shader. The texure is created by first creating an osg::Image, setting its pixel values manually and then assigning the image to a texture. I have verified that the image is created correctly by writing it to a file.
>
> As for the actual texture generation I use the following code:
>
>
> Code:
>
> osg::ref_ptr<osg::Image> m_tileDataImg=nullptr;
>
> // some code to create the osg::image
> // ...
> // ...
>
> auto tileDataTexture=new osg::Texture2D();
>
> tileDataTexture->setWrap(osg::Texture::WRAP_S,osg::Texture::REPEAT);
> tileDataTexture->setWrap(osg::Texture::WRAP_T,osg::Texture::REPEAT);
> tileDataTexture->setFilter(osg::Texture::MIN_FILTER, osg::Texture::NEAREST);
> tileDataTexture->setFilter(osg::Texture::MAG_FILTER, osg::Texture::NEAREST);
> tileDataTexture->setImage(m_tileDataImg);
>
> drawableNode->getStateSet()->setTextureAttributeAndModes(0,tileDataTexture,osg::StateAttribute::ON);
>
>
>
>
>
> In my shader I rendered the texture for debugging purposes and realized that the data was changed. After a closer inspection it turned out that the data had been interpolated, hence my suspicion that the "setFilter" code did not work correctly.
>
> My question is whether there is some other thing I need to do to ensure that no interpolation happens when sampling the texture in my shader?
>
> Any help would be greatly appreciated.
> Thank you!
>
> Cheers,
> antiro
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=72956#72956
>
>
>
>
>
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