Hi, Bernd. Either you are drawing your model with some kind of additive blending enabled (if background and model drawn into same framebuffer or whatever it is), or it is overlay working this way. How you set up blending function? Do you need blending for your model at all? If you dont need to draw transparent model - try to disable blending on your model with setMode(GL_BLEND, osg::StateAttribute::OFF) on stateset of a node at the top of the graph. Also your model have per-vertex colors assigned with transparent alpha values, do you need those?
Cheers, Sergey. 27.08.2012, 13:21, "Bernd Kampl" <bernd.ka...@gmail.com>: > Hi and good day! > Preface (scroll down for my problem): > I'm developing an App based on OSG 3.0 for Android and i'm having a problem > with translucent backgrounds and models. > please bear with me if it's a stupid question. i'll try to explain my problem > in detail and not too confusing. > the source code i'm basing this on is from the osgAndroidExampleGLES1 > (http://forum.openscenegraph.org/viewtopic.php?t=10076). > > i've already changed a lot of things. it's an augmented reality app, meaning > that i'll stream from the camera to a GLSurfaceView and have the EGLview > overlayed on this surfaceview. so far so good. to see the stream from the > camera i obviously need to make the background from the osg part translucent. > to do so, i changed the EGLview.java to initialize the context with > "translucent = true": (from EGLview.java, line 59) > > Code: > public EGLview(Context context, AttributeSet attrs) { > super(context,attrs); > // we need to initialize it with translucent = true. > init(true, 16, 8); > Log.d(TAG, "EGLview(Context, AttributeSet) called"); > } > > this will make the whole background translucent, which is what i want. to > actually see the background i followed the advice i got from this thread > http://forum.openscenegraph.org/viewtopic.php?t=9472 > and in the OsgMainApp.cpp i added this line in the function > OsgMainApp::initOsgWindow(x, y, width, height): > > Code: > _viewer->getCamera()->setClearColor(osg::Vec4(0.0f,0.0f,0.0f,0.0f)); > > which set the backgroundcolor to black with alpha = 0. > again, this is what i want, but it's not an option for me to stream the video > into the osg. > > when i load a model and turn off the camera (as in the GLSurfaceView with the > videostream is removed) it looks like this (and this is how it should look > like): > (click the screenshots to go to bigger versions with higher quality) > [Image: http://i.imgur.com/wRpbxl.jpg ] (http://i.imgur.com/wRpbx.jpg) > > now here comes my problem: > when i turn on the camera the color of the model is lost whenever the camera > is showing something of a light color. like this: > > [Image: http://i.imgur.com/BnukZl.jpg ] (http://i.imgur.com/BnukZ.jpg) > > in the following screenshot i tried to cover half of the camera with a book: > > [Image: http://i.imgur.com/ebF9Pl.jpg ] (http://i.imgur.com/ebF9P.jpg) > > now i'm honestly desperate to find a solution to this, but everything i've > tried so far didn't yield the desired results. has anyone come across a > similar problem or maybe even a solution on this? could it be an error in the > model i'm using? i thank everyone who took the time reading through this. > > some more information on the model i used: > > Code: > Geode { > name "siemens1_aligned_geo.ply" > nodeMask 0xffffffff > cullingActive TRUE > num_drawables 1 > Geometry { > DataVariance STATIC > useDisplayList TRUE > useVertexBufferObjects TRUE > PrimitiveSets 1 > { > DrawArrays POINTS 0 1317508 > } > VertexArray Vec3Array 1317508 > { > 93.6877 -51.5449 20.8001 > //... more data > } > NormalBinding PER_VERTEX > NormalArray Vec3Array 1317508 > { > 0.998192 -0.053112 0.0281376 > // ... again, more data > } > ColorBinding PER_VERTEX > ColorArray Vec4Array 1317508 > { > 0.363281 0.363281 0.359375 0 > // ... yes, more data > } > > Thank you in advance for the smallest hint! > > Cheers, > Bernd[/i] > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=49550#49550 > > _______________________________________________ > 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
