# [osg-users] Culling problem

Paul Martz pmartz at skew-matrix.com
Tue Sep 16 07:48:56 PDT 2008

Look at CullSettings::setComputeNearFarMode() and see if any of the modes
works for you. If they don't, then set it to DO_NOT_COMPUTE_NEAR_FAR and
manually set the near plane to a larger value (further from the eye).

-Paul

_____

From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Vincent
Bourdier
Sent: Tuesday, September 16, 2008 8:24 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Culling problem

Hi Paul

It is exactly the problem.
I've done some tests with the depth test, and I'm sure that what you think
is the problem.
So now, how to solve it ? If I put "depth = new
osg::Depth(osg::Depth::ALWAYS, 0.0, 1.0);" My plane are always visible, but
nothing can hide them (mountains for example...)

Any suggestion or Idea ?

Thanks
Regards,

Vincent.

2008/9/16 Paul Martz <pmartz at skew-matrix.com>

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.
-Paul

_____

From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Vincent
Bourdier
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.

thanks,

Regards

Vincent.

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