Thanks for the feedback. It's definitely related to the camera frustum.
As I move around the scene that frustum/box is bouncing all over the
place and the occlusion queries aren't accurate for most viewer
locations (incorrect # of tests). Looking into the camera creation code
I'm not seeing anything out of the ordinary. I'm using positive near/far
planes, 60 degree fov (converted to radians), a passive viewport and I
set the camera beacon using standard matrix operations.
System_Root
- Cam_Beacon (core: xform)
- User Node (core: xform)
- Scene_Root
- Models
I'll have to spend some more time looking at all the matrices being
passed around. Fortunately, setting the ground plane to a box prevents
it from flickering so I can come back to this dancing frustum once I get
past this deadline. However, if anyone has any other ideas, don't be
shy. :)
Thanks for the help
E.
---
Eric Maslowski
Research Computer Specialist
University of Michigan 3D Lab
email: [EMAIL PROTECTED]
-----Original Message-----
From: Carsten Neumann [mailto:[EMAIL PROTECTED]
Sent: Tuesday, October 28, 2008 19:19
To: [email protected]
Subject: Re: [Opensg-users] Occlusion Culling & Flickering Objects
Hello Eric,
Maslowski, Eric wrote:
> Hi Carsten,
> Thanks for taking a look. I think you might be on to something
> regarding the bounding volumes since the ground plane doesn't seem to
> have a bounding volume and there's a strange warped BV in the distance
> (see images below).
yes, looks like part of the camera frustum ?
> I'm a little confused as to why the BV is playing such a role, though.
I
> thought OpenSG was using the OcclusionQuery interface for these tests.
> So, it should be rendering the object to test for visibility...unless
> the BV is rendered for the query instead to speed up the query
process.
> Is this the case?
as Marcus already confirmed, yes, the bounding volumes are used in the
OC tests.
> http://www-personal.umich.edu/~emaslows/temp/osg/osg_occ-bv_01.jpg
> http://www-personal.umich.edu/~emaslows/temp/osg/osg_occ-bv_02.jpg
hm, do you do anything unusual with your cameras/view frustums, have
negative near clipping plane ?
As soon as I've remembered how I make cvs print at least remotely useful
logs, I'll see if any of the recent changes give a hint.
Carsten
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