Re: [osg-users] Fading LOD transistions
Hi Judd, The core OSG does have a FadeLOD feature. One can implement it a higher level but its a bit awkward. Robert. On Feb 15, 2008 6:38 PM, Judd Tracy [EMAIL PROTECTED] wrote: Does osg support or has anybody implemented fading between LOD transistions? I found an old thread where someone talks about it but no word if anything ever happened with it http://osgcvs.no-ip.com/osgarchiver/archives/June2003/0162.html -- Judd Tracy Institute for Simulation and Training University of Central Florida 407-882-1405 ___ 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] Fading LOD transistions
One approach is to use shaders for fading. Here's a simple example: https://wush.net/websvn/osggis/filedetails.php?repname=osggispath=%2Ftrunk%2Fsrc%2FosgGIS%2FFadeHelper.cpp Of course you'd need to augment the shaders to support lighting, texturing etc., but you get the idea. -gw On Feb 15, 2008 1:38 PM, Judd Tracy [EMAIL PROTECTED] wrote: Does osg support or has anybody implemented fading between LOD transistions? I found an old thread where someone talks about it but no word if anything ever happened with it http://osgcvs.no-ip.com/osgarchiver/archives/June2003/0162.html -- Judd Tracy Institute for Simulation and Training University of Central Florida 407-882-1405 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Glenn Waldron : Pelican Mapping : http://pelicanmapping.com : 703-652-4791 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Fading LOD transistions
Thoughts... Fade-LOD is an interesting feature: the concept is to smooth transitions between LOD switches by rendering two adjacent LODs with varying transparency to minimize visual popping. However, the whole point of LOD is to control rendering load, and Fade-LOD *increases* rendering load (essentially doubling during the fade) at the exact moment you want it to decrease. IMHO, if we're talking about adding a feature, suggest instead Morph-LOD: interpolating verts from one LOD's geometry to the other's, then adjusting the actual number of verts after the transition is complete. Of course that requires more on the database/code side, and for terrain the effect is more like rolling ocean than ghostly fading. My $0.02 on the wonderful continuum of compromises. cheers -- mew On Fri, February 15, 2008 12:38, Judd Tracy wrote: Does osg support or has anybody implemented fading between LOD transistions? I found an old thread where someone talks about it but no word if anything ever happened with it http://osgcvs.no-ip.com/osgarchiver/archives/June2003/0162.html -- Judd Tracy Institute for Simulation and Training University of Central Florida 407-882-1405 Mike Weiblen -- Austin Texas USA -- http://mew.cx/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Fading LOD transistions
Does osg support or has anybody implemented fading between LOD transistions? I found an old thread where someone talks about it but no word if anything ever happened with it http://osgcvs.no-ip.com/osgarchiver/archives/June2003/0162.html -- Judd Tracy Institute for Simulation and Training University of Central Florida 407-882-1405 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
