Hi Martin,
Do all the images have an alpha channel? i.e. RGBA?
Is blending enabled, i.e, do you have a GL_BLEND enabled? Such as via:
stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
Robert.
On 5 May 2012 13:30, Martin Oswald <martin.r.osw...@gmail.com> wrote:
> Hi,
>
> I encounter the following issue with semi-transparent texture images:
> After loading a textured model from a file, I want to change the texture
> image into an image sequence.
> My code looks similar to the one of the 'osgimagesequence' example program.
> The texture replacement works fine and the image sequence shows up as
> expected, except of the following issue:
> The original image loaded from the file has different transparency values for
> every pixel.
> The image sequence replacing the single image also has different transparency
> values for every pixel and every frame.
> While the image content (rgb-values) is showing up correctly the transparency
> values are not updated and stay constant for the whole image sequence.
> In particular, the transparency values shown for the image sequence are still
> the same as the ones from the original image.
> In short, replacing the texture image seems to update the rgb-values but not
> the transparency values.
>
> Here is a code snipped :
>
>
> Code:
>
> osg::StateAttribute* attr =
> stateSet->getTextureAttribute(textureNum,osg::StateAttribute::TEXTURE);
> if (attr)
> {
> texture2D = dynamic_cast<osg::Texture2D*>(attr);
>
> if (texture2D)
> {
> texture2D->setDataVariance(osg::Object::DYNAMIC);
> texture2D->setFilter(osg::Texture::MIN_FILTER,osg::Texture::LINEAR);
> texture2D->setFilter(osg::Texture::MAG_FILTER,osg::Texture::LINEAR);
> texture2D->setWrap(osg::Texture::WRAP_R,osg::Texture::REPEAT);
> texture2D->setResizeNonPowerOfTwoHint(false);
> texture2D->setImage(imageSequence.get());
> }
> }
>
>
>
>
>
> I have tried changing/updating the osg::Material node and/or adding
> osg::BlendFunc to change the transparency properties but without the desired
> result.
> I would highly appreciate if someone could give me a hint on how to fix this
> issue.
>
> Thanks a lot.
>
> Cheers,
> Martin
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=47566#47566
>
>
>
>
>
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