Re: [osg-users] [vpb] Placing an object on a UTM file generatedwith osgdem
OSG uses z-up... -Shayne -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Ethan Fahy Sent: Wednesday, March 07, 2012 9:08 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] [vpb] Placing an object on a UTM file generatedwith osgdem For the record, it looks like the camera up vector when using an osgdem-generated terrain with UTM coordinates should be (0,0,1) as opposed to the (0,1,0) that is often seen. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=46090#46090 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [vpb] Placing an object on a UTM file generatedwith osgdem
The --geocentric flag in osgdem builds a round earth database in meters with the coordinate system origin being the center of the earth. When you place your models on the earth (position and orientation), you'll need to keep this in mind. If your models are in meters you should be good and no rescaling is needed. Hopefully this addresses your question. -Shayne -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Ethan Fahy Sent: Wednesday, October 12, 2011 9:53 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] [vpb] Placing an object on a UTM file generatedwith osgdem I got everything working but have one more question: If the units of the object I am attaching to my terrain are in meters, and the original geotiffs that I started with before converting them using osgdem were also in meters, is any further scaling of the attached object necessary? I am worried that by converting the geotiffs to ive files using the --geocentric osgdem flag I may have changed the units of the terrain and may need some sort of ellipsoid model-based scaling equation for any objects that I attached to the terrain. Anybody have an answer to this? Much obliged. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=43359#43359 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [vpb] Placing an object on a UTM file generatedwith osgdem
On 10/12/2011 10:12 AM, Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC wrote: The --geocentric flag in osgdem builds a round earth database in meters with the coordinate system origin being the center of the earth. When you place your models on the earth (position and orientation), you'll need to keep this in mind. If your models are in meters you should be good and no rescaling is needed. Yes. And (I think I've already mentioned this) make sure you calculate your static up-vector for the object. Technically you need to recalculate this anytime the object moves, but it varies so slowly that unless you move far it's not a big deal. -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
