There are techniques to perform order independent transparent rendering, one of these is demonstrated in the osgoit example of OpenSceneGraph. However osgoit uses a multipass technique and can be rather slow.
Christian 2016-02-04 9:31 GMT+01:00 Voerman, L. <l.voer...@rug.nl>: > Hi Erik, > the effect you see is caused by your blend function being order dependent, > for a good result transparent triangles need to be drawn back to front. > Did you set the rendering_hint to TRANSPARENT_BIN (binNumber 10 / binName > DepthSortedBin)? > like in stateSet->setRenderingHint(StateSet::TRANSPARENT_BIN); > Regards, Laurens. > > On Wed, Feb 3, 2016 at 9:48 PM, Erik Hensens <ehens...@hunter.com> wrote: > >> Hi everybody! >> >> I have two geodes, each is a flat circular disk with some circular holes >> removed. Each geode is flat in the YZ plane, and they are stacked against >> each other with a small amount of spacing, centered at (x1, 0, 0) and (x2, >> 0, 0). There is a single parent matrix transform node that is the parent of >> both of these geodes, and I use the matrix transform to set different >> rotations. Each of these disk geodes is semi-transparent by means of >> calling setAlpha on their materials for the FRONT_AND_BACK faces. >> >> The problem is that at certain parent matrix transform rotations certain >> parts of the first disk are more visually prevalent and at other rotations >> certain parts of the second disk are more visually prevalent, i.e. how >> these two semi-transparent geodes are viewed against each other changes >> based on the rotation of the parent matrix transform. I've attached two >> images to show you the difference. >> >> What is causing this effect and how can I eliminate it? I want it to look >> the same no matter what the rotation of the parent matrix transform is. >> >> Thanks in advance for any help! >> >> Cheers, >> Erik >> >> ------------------ >> Read this topic online here: >> http://forum.openscenegraph.org/viewtopic.php?p=66186#66186 >> >> >> >> >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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