[osg-users] Culling problem

Paul Martz pmartz at skew-matrix.com
Tue Sep 16 07:19:16 PDT 2008

If the polygons are very close to the ground and your eye is quite distant,
then it sounds like it's losing the depth test.


From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Vincent
Sent: Tuesday, September 16, 2008 5:22 AM
To: osg
Subject: [osg-users] Culling problem

Hi all,

I have a strange problem : Nodes are moving (PAT->LOD->Node.ive) depending
on a PAT and all the PATs have the same group for parent.
Theses nodes (planes) have the ground under them but, sometimes the planes
are hidden under the ground.

It happens when the camera it on a top-position (not side or face ) of the
planes and it depend on the point looked by the camera. Just modifying
camera's orientation make then appear.
If the camera if near of the plane nothing happen.

I have checked Z position, but it do not changed anormaly. I only see a
culling problem to have this problem.

Do you have already encountered something similar ?
How to solve this problem ?

See attached files to understand better what it looks like.




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