Re: [osg-users] TerraPage terrain LODs are jumping again - have LOD ranges to be sorted?
Yes, that solved it! Yay! Cheers, Martin -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=31501#31501 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] TerraPage terrain LODs are jumping again - have LOD ranges to be sorted?
Hi, this is a problem that was fixed some time ago but pops up again now. I have a terrapage terrain that loads fine, but every few seconds the detailed LODs are swapped against lower res ones and back again. This looks funny and bogs down the system. After poking around with a debugger the only thing that I noticed is that the LOD ranges are sorted high to low: For example: _rangeList[0] goes from 1000 to MAX_FLOAT _rangeList[1] goes from 0 to 1000 Can this cause these problems? Thank you! Cheers, Martin -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=31409#31409 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] TerraPage terrain LODs are jumping again - have LOD ranges to be sorted?
I just noticed that I only get the effect when I have long-running operations in the cull traversal. I'll try to post a replicable test scenario. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=31410#31410 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] TerraPage terrain LODs are jumping again - have LOD ranges to be sorted?
Hi Martin, For PagedLOD nodes the children should always be ordered from lowest resolution/ furthest distance first, to highest resolution/near distance last. What you describe fits this just fine. The TerraPage plugin has extra scheme above PagedLOD that seek to hold back use of higher resolution children when a neighbouring tile is of too low a resolution for the boundary meshes to be able to fit together. This scheme is pretty complicated and is very specific to the way that TerraPage maintains central and boundary meshes. I haven't personally seen the cycling you talk about but my guess is that this is the most fruitful area to look at when searching for a cause. Robert. On Wed, Sep 8, 2010 at 12:18 PM, Martin Scheffler osgfo...@tevs.eu wrote: Hi, this is a problem that was fixed some time ago but pops up again now. I have a terrapage terrain that loads fine, but every few seconds the detailed LODs are swapped against lower res ones and back again. This looks funny and bogs down the system. After poking around with a debugger the only thing that I noticed is that the LOD ranges are sorted high to low: For example: _rangeList[0] goes from 1000 to MAX_FLOAT _rangeList[1] goes from 0 to 1000 Can this cause these problems? Thank you! Cheers, Martin -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=31409#31409 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] TerraPage terrain LODs are jumping again - have LOD ranges to be sorted?
Robert Osfield Wrote: For PagedLOD nodes the children should always be ordered from lowest resolution/ furthest distance first, to highest resolution/near distance last. What you describe fits this just fine. Would it be possible to add this constraint in PagedLOD header ? The only information available in the source for now is in LOD header : LOD may display multiple children simultaneously if their corresponding ranges overlap. Children can be in any order, and don't need to be sorted by range or amount of detail. If the number of ranges (m) is less than the number of children (n), then children m+1 through n are ignored. and could be misleading regarding the behaviour of PagedLOD which inherits from LOD. I've been fooled by this in the past :) Best Regards, Luc Robert Osfield robert.osfi...@gmail.com Envoyé par : osg-users-boun...@lists.openscenegraph.org 09/08/2010 02:19 PM Veuillez répondre à OpenSceneGraph Users osg-users@lists.openscenegraph.org A osg-users@lists.openscenegraph.org cc Objet Re: [osg-users] TerraPage terrain LODs are jumping again - have LOD ranges to be sorted? Hi Martin, For PagedLOD nodes the children should always be ordered from lowest resolution/ furthest distance first, to highest resolution/near distance last. What you describe fits this just fine. The TerraPage plugin has extra scheme above PagedLOD that seek to hold back use of higher resolution children when a neighbouring tile is of too low a resolution for the boundary meshes to be able to fit together. This scheme is pretty complicated and is very specific to the way that TerraPage maintains central and boundary meshes. I haven't personally seen the cycling you talk about but my guess is that this is the most fruitful area to look at when searching for a cause. Robert. On Wed, Sep 8, 2010 at 12:18 PM, Martin Scheffler osgfo...@tevs.eu wrote: Hi, this is a problem that was fixed some time ago but pops up again now. I have a terrapage terrain that loads fine, but every few seconds the detailed LODs are swapped against lower res ones and back again. This looks funny and bogs down the system. After poking around with a debugger the only thing that I noticed is that the LOD ranges are sorted high to low: For example: _rangeList[0] goes from 1000 to MAX_FLOAT _rangeList[1] goes from 0 to 1000 Can this cause these problems? Thank you! Cheers, Martin -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=31409#31409 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
