> Also, Do you setup a blendfunction and activate it for the stateset?
No I didn't. The thing is, I made some other shaders for a volume light, and there I just enabled blending and it worked as I expected. And to clarify what I mean with that: I thought that normal 'standard' blending involved mixing the colors something like this: mix(source.rgb, dest.rgb, dest.a). so in other words, it would use the rgb in the framebuffer and mix the color of the new pixels based on the alpha of the new pixel (ignoring the alpha value from the source pixel). > I don't understand what you mean? Can you point to the blendfunction here? > There is no simple way to blend onyl gl_FragData[0] without touching the > other buffers. I guess, now I looked at the blend functions of opengl better (sorry I'm kinda new with opengl), that I would like a glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_DST_ALPHA); Does that make sense? that matched with I said above right? > As said before: Blending function is applied to all bound > buffers. > what about glBlendFunci, which enabled different blendings per buffer... or is that not supported? > So could try to post your buffer setup and your passes or at least > create a minimalistic example showing your problem? > A little more context on what you are trying to achieve would be helpful too I will try to post some code tonight if needed, don't have access to it right now. For context: I am rendering terrain with water. the surface of the water is partly transparant. for the part underwater I want to use some form of fog effect and for the part above water I use some other 3d fog effect. So if the camera is above water and look at the water it need to do the following for each pixel: -start with the terrain color (from rendered terrain) -apply underwater effect -apply the semi-transparent water-surface pixel (from rendered water) -apply above water fog effect So the thing is: I need both the original rendered terrain pixel and also the original rendered water-surface pixel. so that is why I want to render my terrain and my water-surface to two separate buffers, so that in the 'final' shader (the deffered one or however you call it) I have access to both the rendered water and the rendered terrain under that water and calculate the final pixel in a way that I find logical. I understand that there might be tons of other ways to do this, but as I'm pretty new I hope to do things first in a way which seems logical to me, before doing it some other way that is harder to understand for me. But still if you have a better idea on how to do what I want I'm open for it :) Hope I explained this clear enough! ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57134#57134 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
