Hi, I know that I want to render some nodes without Z-buffer. It is a choice, implemented as a solution enabled ans disabled in real-time execution, when necessary. Sure there will be no nodes (clouds) over it. I know exactly what can be the associated problems.
Near/Far calculation is already disabled , but the scene is big, so this is not a surprised that the culling have difficulties. So, to make a real No Z-buffer on some node, do you have any idea ? Thanks, Regards, Vincent. 2008/12/3 Jean-Sébastien Guay <[EMAIL PROTECTED]> > Hi Vincent, > > My goal is to set this state in a callback, to allow changes when camera >> is near the plane : the culling is good without cheating... when camera is >> far from it, the culling/zbuffer makes stranges things, so I would make the >> necessary things to set the plane always visible... >> > > Setting the node to always render without the z-buffer is not a fix, it's a > workaround. It will introduce other problems when something else (a cloud > perhaps) is on top of the airplane. > > The result you're seeing is z-fighting, and is a result of poor z-buffer > precision (you have too much distance between your near and far planes to > have enough precision to represent the distance between two objects, so the > z-buffer thinks object A is in front of object B when it's the opposite). > > The fix is to fix your z-buffer precision problem. Do you disable automatic > near/far calculation? You probably should not, since this would make sure > that your near plane is at the top of your airplane, and your far plane is > below your ground. > > Or perhaps your ground is a very very large sphere where no part of the > sphere can be culled away, so the far plane is actually behind the Earth > (which is very far away relatively to the distance between the airplane and > the ground)... > > Look into these problems, and you'll be able to fix the real problem. Hope > this helps, > > J-S > -- > ______________________________________________________ > Jean-Sebastien Guay [EMAIL PROTECTED] > http://www.cm-labs.com/ > http://whitestar02.webhop.org/ > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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