Hi, I am trying to render a semitransparent cylindrical container with the following strategy:
Create a drawable for the cylinder's back faces first by relying on GL_CULL_FACE using a specific winding order of the quads to only render the rear wall. Add this drawable to the Geode first. Create a drawable for the cylinder's front faces first by relying on GL_CULL_FACE using the opposite winding order of the quads to only render the front wall. Add this drawable to the Geode next. I take the same approach with the top and bottom faces of the cylinder, carefully choosing an order in which the transparency looks correct for all viewing angles. And to make things even more complicated, I also display a transparent liquid that is contained inside the container. This worked reasonably well because it seemed that the drawables inside my geode were processed in the order that I added them to the geode. Now I added shaders to the individual drawables and some state sets are different among my various drawables. Unfortunately now the predictable drawing order has broken down and my transparency often looks incorrect. I have tried using render bins with the depth sorting flag enabled - this looks correct for each individual container but it looks horrible when one container is seen behind another. I wish there was such a thing as localized renderbins for drawables contained inside a geode. I need to achieve a guaranteed render order for drawables owned by a single geode. Are there any insights for rendering transparent stuff from the OSG community? Are there proven approaches to rendering transparency correctly for objects? I could override the drawImplementation, I guess... Christian _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
