Hi Juan, there is no problem, it is a normal behaviour.
What you can try is to enable backface culling, then the artefacts should disappear. This behvaiour comes from rendering of triangles no in the correct order. Osg doesn't provide triangle sorting on transparent objects as far as I know. Only per object sorting is supported. Cheers, Art --- Juan Casanueva <[EMAIL PROTECTED]> schrieb am Di, 17.6.2008: > Von: Juan Casanueva <[EMAIL PROTECTED]> > Betreff: [osg-users] Artefacts in transparent objects > An: [email protected] > Datum: Dienstag, 17. Juni 2008, 13:24 > Hi there, > > I am having some problems with transparent objects. They > have some artefacts > (slices) depending on the view point. > To illustrate the problem, I have done a simple example > that draws a > transparent red sphere with a box inside it. > I have attached screenshots showing the strange > "slices" appearing in the > sphere. > I must be missing something. any help would be > appreaciated. > > Here is the code: > > #include <osg/Geode> > #include <osg/ShapeDrawable> > #include <osg/Material> > #include <osgViewer/Viewer> > #include <osgViewer/ViewerEventHandlers> > > int main( int argc, char **argv ) > { > osgViewer::Viewer viewer; > viewer.addEventHandler(new osgViewer::StatsHandler); > viewer.addEventHandler(new osgViewer::WindowSizeHandler); > > > osg::Group *root = new osg::Group; > > // transparent sphere > osg::Geode *sphereGeode = new osg::Geode; > sphereGeode->addDrawable(new osg::ShapeDrawable(new > osg::Sphere(osg::Vec3(0.0f,0.0f,0.0f),40.0f))); > > osg::StateSet* pStateSet = > sphereGeode->getOrCreateStateSet(); > pStateSet->setMode(GL_BLEND,osg::StateAttribute::ON); > > pStateSet->setRenderingHint(osg::StateSet::TRANSPARENT_BIN); > > osg::Material *pMat = new osg::Material; > pMat->setDiffuse(osg::Material::FRONT_AND_BACK, > osg::Vec4(1, 0, 0, 0.5)); > pMat->setAlpha(osg::Material::FRONT_AND_BACK, 0.5); > > sphereGeode->getOrCreateStateSet()->setAttributeAndModes(pMat, > osg::StateAttribute::ON); > > root->addChild(sphereGeode); > > // box inside sphere > osg::Geode *boxGeode = new osg::Geode; > boxGeode->addDrawable(new osg::ShapeDrawable(new > osg::Box(osg::Vec3(0.0f,0.0f,10.0f),10.0f))); > > root->addChild(boxGeode); > > viewer.setSceneData( root ); > > return viewer.run(); > } > > > > Thanks > Juan_______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org __________________________________________________________ Gesendet von Yahoo! Mail. Dem pfiffigeren Posteingang. http://de.overview.mail.yahoo.com _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
