Hi Edgar, Glad to hear it worked for you!
Jason -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Edgar Ellis Sent: Friday, May 26, 2006 8:55 A To: osg users Subject: Re: [osg-users] osgTerrain elevation accuracy Hi Jason, I did a quick test with your patch and things seem to be working properly for me now. Thanks, - Edgar Jason Beverage wrote: > Hi Edgar, > > Yup, that will definitely cause a difference. I submitted a change to > osgTerrain yesterday that takes care of that issue. Have you had a > chance to look at those changes yet Robert? > > Thanks, > > Jason > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Edgar Ellis > Sent: Tuesday, May 23, 2006 4:22 P > To: osg users > Subject: Re: [osg-users] osgTerrain elevation accuracy > > > I tried your changes, but I'm still getting problems as well. > However I did manage to get much better results using a power of 2 + 1 > sized dem and a 65x65 tile size. > > One idea why the paged database might be slightly off: > Suppose you have a tile whose extents cover from .5 to 8.5px of a dem. > When readHeightField is called for that tile, the tile will be created > from the 0-9px of the dem. > So now your tile represents 9px instead of 8px it's extents indicate. > Is that enough to cause a noticeable difference? > > Thanks, > - Edgar > > Jason Beverage wrote: > >> Hi Edgar, >> >> I did a quick substitution of all bounding box code in the DataSet >> > class with a 2D double bounding box called GeospatialExtents as Robert > suggested. I've tried it on a few datasets here and things have worked > fine so far, but the issue I'm having with scene graph heights being off > by quite a large amount from the source data is still present. > >> I added a bool, interpolateTerrain in readHeightField that takes an >> > alternate code path to attempt to prevent upsampling of the terrain by > GDAL, but my problem still exists. > >> I figured since I'd made these changes I'd send it out to you to see >> > if it fixed whatever problems you've been having with the float bounding > boxes. > >> Thanks, >> >> Jason >> >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> > [mailto:[EMAIL PROTECTED] On Behalf Of Jason > Beverage > >> Sent: Tuesday, May 09, 2006 9:10 A >> To: osg users >> Subject: RE: [osg-users] osgTerrain elevation accuracy >> >> I'll try to do this today. I've written some code to do bilinear >> interpolation on the source terrain data, but it is still off. Maybe >> > a > >> combination of it and the double bounding box will solve the issues >> > I'm > >> having. >> >> Thanks for your help, >> >> Jason >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of Robert >> Osfield >> Sent: Tuesday, May 09, 2006 4:31 A >> To: osg users >> Subject: Re: [osg-users] osgTerrain elevation accuracy >> >> On 5/8/06, Edgar Ellis <[EMAIL PROTECTED]> wrote: >> >> >>> I haven't had a chance deal with the bounding box precision, but as >>> Robert said using doubles should solve the problem (perhaps a >>> >>> >> BoundingBoxd?) >> >> A local double XY box would be more appropriate as it only uses the XY >> dimensions of the osg::BoundingBox. >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://openscenegraph.net/mailman/listinfo/osg-users >> http://www.openscenegraph.org/ >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://openscenegraph.net/mailman/listinfo/osg-users >> http://www.openscenegraph.org/ >> >> > ------------------------------------------------------------------------ > >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://openscenegraph.net/mailman/listinfo/osg-users >> http://www.openscenegraph.org/ >> > > _______________________________________________ > osg-users mailing list > [email protected] > http://openscenegraph.net/mailman/listinfo/osg-users > http://www.openscenegraph.org/ > > _______________________________________________ > osg-users mailing list > [email protected] > http://openscenegraph.net/mailman/listinfo/osg-users > http://www.openscenegraph.org/ > _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/ _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
