Paul,
As far as I know default OSG culling is only done against the sides and
not against the near and far plane.
See:
enum MaskValues
{
NO_CULLING = 0x0,
VIEW_FRUSTUM_SIDES_CULLING = 0x1,
NEAR_PLANE_CULLING = 0x2,
FAR_PLANE_CULLING = 0x4,
VIEW_FRUSTUM_CULLING = VIEW_FRUSTUM_SIDES_CULLING|
NEAR_PLANE_CULLING|
FAR_PLANE_CULLING,
SMALL_FEATURE_CULLING = 0x8,
SHADOW_OCCLUSION_CULLING = 0x10,
DEFAULT_CULLING = VIEW_FRUSTUM_SIDES_CULLING|
SMALL_FEATURE_CULLING|
SHADOW_OCCLUSION_CULLING,
ENABLE_ALL_CULLING = VIEW_FRUSTUM_CULLING|
SMALL_FEATURE_CULLING|
SHADOW_OCCLUSION_CULLING
};
--
Roland
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf
> Of Paul Martz
> Sent: maandag 22 september 2008 16:46
> To: 'OpenSceneGraph Users'
> Subject: Re: [osg-users] setLODScale affecting near far planes?
>
> > Hi all again,
> >
> > Robert: for you last question; yes, I have near/far culling enabled
> > and the near/far setting is
> compute_near_far_using_bounding_volume. If
> > the near far modification that is taking place should be
> very small,
> > somehow I am still getting quite significant jumps because some
> > objects near the camera get culled when I would not like that to
> > happen. When I enable culling for near/far planes, it seems
> like osg
> > takes into account my preferred near/far planes and is NOT
> > auto-computing. It does do some re computation as I change the
> > LODScale. Why does this happen?
>
> You have said on multiple occasions that you are "enabling
> near/far culling"
> -- What exactly do you mean by that? Near/far culling is
> always enabled in OSG and OpenGL, so I'm curious to know what
> function call you are making that you believe is enabling
> near/far culling.
>
> > Paul:
> > >Do you get the same behavior when viewing your database in
> osgviewer
> > >and hitting the * and / keys?
> > > -Paul
> >
> > Sorry Paul, but it is hard for me to say, because with osgviewer I
> > only notice the terrain loosing or gaining detail, but since I am
> > unable to dump the camera information in osgviewer I cannot
> compare it
> > to my application's printouts of near far planes, but
> thanks for the
> > advice.
>
> If you don't get the dame behavior in osgviewer, then most
> likely this is a bug in your own application somewhere, and
> not a problem in OSG.
>
> You can dump the osgviewer camera information by editing the
> osgviewer source.
> -Paul
>
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