Hi, I am not using this functionality at the moment but I do plan on doing so in the relatively near future. As such, please keep posting any findings you make. If it looks like some modifications to the code could help performance I would be willing to chip in some effort.
Cheers, Brad -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC Sent: Wednesday, 28 July 2010 2:26 AM To: OpenSceneGraph Users Subject: Re: [osg-users] osgSim HeightAboveTerrain performance... Since I didn't receive any input or feedback on my previous inquiry, I'm assuming no one has used osgSim very much in an extensive setting.?.? At any rate, I've done some further investigation. It appears that performance is very poor when HAT inquiries are randomly called in different portions of the code via the osgSim::HeightAboveTerrain::computeHeightAboveTerrain(.) method. On the other hand, if HAT points via hat.addPoint() are collected up and then computed (intersections) in one place, performance improves. I'm assuming that this is the correct usage for OSG? If this is true, I must say that this is a major problem since HAT inquiries need to be done at different times throughout the application due to dependencies on HAT for other calculations. I would like some feedback from someone in the know on osgSim so I know what the proper usage is for maximum performance. If it is true that all HAT points in OSG need to be consolidated for intersection calculation, then I will attempt to refactor the code to support what OSG wants. Thanks, -Shayne -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tueller,Shayne R Civ USAF AFMC 519 SMXS/MXDEC Sent: Friday, July 23, 2010 10:57 AM To: OpenSceneGraph Users Subject: [osg-users] osgSim HeightAboveTerrain performance... All, I was wanting some feedback for those who have used osgSim in querying VPB database info such has HAT, LOS, etc., during runtime. I'm seeing some performance issues when using osgSim::HeightAboveTerrain::computeHeightAboveTerrain(.) to get the HAT value for a particular location in the database. At times, we need multiple HAT values per frame which seems to bog the performance down. I would surmise that LOS calculations are probably worse since multiple intersections are computed. My question is, is how efficient is the osgSim HAT function? Is the process of retrieving HAT a slow one? If so, is there a way to improve performance if one or more HAT requests are issued on a per frame basis? Thanks in advance, -Shayne DISCLAIMER:--------------------------------------------------------------------------- This e-mail transmission and any documents, files and previous e-mail messages attached to it are private and confidential. They may contain proprietary or copyright material or information that is subject to legal professional privilege. They are for the use of the intended recipient only. Any unauthorised viewing, use, disclosure, copying, alteration, storage or distribution of, or reliance on, this message is strictly prohibited. No part may be reproduced, adapted or transmitted without the written permission of the owner. If you have received this transmission in error, or are not an authorised recipient, please immediately notify the sender by return email, delete this message and all copies from your e-mail system, and destroy any printed copies. Receipt by anyone other than the intended recipient should not be deemed a waiver of any privilege or protection. Thales Australia does not warrant or represent that this e-mail or any documents, files and previous e-mail messages attached are error or virus free. -------------------------------------------------------------------------------------- _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
