[osg-users] Update Optimization

John Burgess john.burgess at rocketmail.com
Fri Jul 4 09:47:33 PDT 2008

Hi Robert,
In the update call back, I use the intersector to compute the height above terrain and the normal for each tank and position it on the terrain in every frame. So for 300 tanks, the height and normal computation will be performed 300 times per frame which takes about 700 ms during the update traversal from the traversal time graphical display. What can be done to reduce the update time and yet able to achieve my aim of positioning the tanks correctly on the terrain?

----- Original Message ----
From: Robert Osfield <robert.osfield at gmail.com>
To: OpenSceneGraph Users <osg-users at lists.openscenegraph.org>
Sent: Saturday, July 5, 2008 12:33:32 AM
Subject: Re: [osg-users] Update Optimization

Hi John,

What exactly is taking all the time?  Your own physics code?
Intersection code?  You have said anything about what you do in the
update other that update positions.


On Fri, Jul 4, 2008 at 5:25 PM, John Burgess
<john.burgess at rocketmail.com> wrote:
> Hi all,
> My viewer needs to support at least 400 entities running at 30 Hz. My
> entities are all moving tanks and I need to clamp them to the terrain using
> an update call back in every frame, the frame rate will drop to 3 Hz when I
> load 300 tanks with the update cycle taking up a huge amount of time. How
> can I achieve 30 Hz for 400 entities and yet be able to clamp them to the
> terrain?
> Thanks,
> John
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