- Add a user data variable to the LOD that identifies the last LOD child that the attach was done for. - Add a cullcallback to all LOD children that checks if the parent LOD's user data variable is different than the current child. If it's different then you need to reattach, then reset the parent LOD user data variable to the current child.
You may not want to perform the attach in the cull. It might be better to wait until the next update. I haven't actually tried this and it won't work for LODs with multiple children that are active (not culled) for a given range. Brian [EMAIL PROTECTED] wrote: ----- To: "OpenSceneGraph Users" <[email protected]> From: Brian <[EMAIL PROTECTED]> Sent by: [EMAIL PROTECTED] Date: 02/01/2008 03:29PM Subject: Re: [osg-users] PagedLOD: Notification or callback when an LOD is changed. Hi Brad, I would recommend you read through the PagedLOD.cpp file especially the "traverse()" function. There isn't a callback for when the LOD changes happen. You could create an UpdateCallback() that would calculate the current LOD, but it sounds awful complex and error prone. osgdem generatates a series of nested LODs so you would have to figure out which LODs are relevent, plus deal with the loading of PagedLODs. Could you instead create LODs for your buildings with a matrix transform and adjust the position of the building slightly for different distances from the camera that match when the terrain LOD changes? You could load your terrain in osgSceneMaker and create LODs for your building adjusting them up and down for difference distances away from the camera that match with when the terrain LOD changes then save the LODs to an .ive file. Another thing you could try is to use the --no-terrain-simplification setting in osgdem or look in the source code for osgdem and increase the desired triangles during simplification (Can't rememember the exact line but search for 512 in the code.) This will lower your FPS and increase your file size, but it would reduce the terrain shifting. Brian http://osgscenemaker.googlepages.com _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
