Hi Florian We can't really help you without know how work your multi pass system.
My guess is that osg draw your first pass #1 - draw original with a little offset, then transparency pass, then pass #2 - draw "tinted". You can use osg::StateSet::RenderingHint(osg::StateSet::TRANSPARENT_BIN) in your transparency stateSet this will tell to osg that your geometry is transparency and have to be draw after other drawable and from front to back order Take a look to osg::StateSet::setRenderBinDetails and osgUtil::RenderBin and how all of this work. HTH David 2013/9/25 Florian Kolbe <[email protected]> > Hi, > > 1. for transparent walls we use our own node (derived from "Effect") - see > code below > 2. for "tinting" objects, we also use an effect node derived from "Effect" > - see code below > > Used by themselves, everything works fine. But if we have a "tinted" > object behind a "transparent" object, the "tinting" effect is gone (see > screenshot). > > Code for transparency effect: > > Code: > void define_passes() > { > // implement pass #1 > { > // s.a. http://www.mail-archive.com//msg13796.html > osg::ref_ptr<osg::StateSet> stateSet = new osg::StateSet; > > // mat > osg::Material* mat = new osg::Material; > mat->setAlpha(osg::Material::FRONT_AND_BACK, alpha); > stateSet->setAttributeAndModes(mat, > osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE); > > // backface culling, führt dazu dass innere Rückseiten > nicht angezeigt werden > osg::CullFace* cull = new osg::CullFace(); > cull->setMode(osg::CullFace::BACK); > stateSet->setAttributeAndModes(cull, > osg::StateAttribute::ON); > > // turn on blending > osg::BlendFunc* bf = new > osg::BlendFunc(osg::BlendFunc::SRC_ALPHA, > osg::BlendFunc::ONE_MINUS_SRC_ALPHA ); > stateSet->setMode(GL_BLEND, osg::StateAttribute::ON | > osg::StateAttribute::OVERRIDE); > stateSet->setAttributeAndModes(bf); > // rendering hints > stateSet->setRenderingHint(osg::StateSet::TRANSPARENT_BIN); > // lighting > stateSet->setMode(GL_LIGHTING, osg::StateAttribute::OFF); > > addPass(stateSet.get()); > } > } > > > > Code for "coloring" effect: > > Code: > void define_passes() > { > // implement pass #1 - draw original with a little offset > { > osg::ref_ptr<osg::StateSet> ss = new osg::StateSet; > > osg::ref_ptr<osg::PolygonOffset> polyoffset = new > osg::PolygonOffset; > polyoffset->setFactor(1.0f); > polyoffset->setUnits(1.0f); > ss->setAttributeAndModes(polyoffset.get(), > osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON); > > addPass(ss.get()); > } > // implement pass #2 - draw "tinted" > { > osg::ref_ptr<osg::StateSet> ss = new osg::StateSet; > // Material überschreiben > ss->setAttributeAndModes(_wf_mat.get(), > osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON); > > // notwendig, damit alpha greift > > ss->setMode(GL_BLEND,osg::StateAttribute::ON|osg::StateAttribute::OVERRIDE); > > addPass(ss.get()); > } > } > > > > See attached image: > The fire extinguisher should be all yellow, but behind the transparent > wall - it is as if it was rendered without the effect. > > I hope someone can sched some light on this issue? > > Thank you! > > Florian > > PS sorry if the code snippets come out weird, leading space for > indentation somehow goes wrong...[/img][/code] > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=56477#56477 > > > > > Attachments: > http://forum.openscenegraph.org//files/transparency_bug_132.png > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
_______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
