Murray, Excellent! I'm glad you got things working...
-Shayne -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Murray G. Gamble Sent: Thursday, November 25, 2010 10:58 AM To: OpenSceneGraph Users Subject: Re: [osg-users] osgSim::HeightAboveTerrain not returning any hits Thanks, Shayne. It was the --geocentric flag missing from the osgdem that was messing everything up. Once this was fixed, I also had to correct the way that I was positioning the observer eyepoint to account for the geocentric nature of the terrain (I now use EllipsoidModel::computeLocalToWorldTransformFromLatLonHeight() to generate a matrix that is used to position the eyepoint, rather than using lat/lon information directly). Murray On 2010-11-24, at 4:59 PM, Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC wrote: Just a few questions from your code... 1) I noticed that your osgdem command isn't using --geocentric in the command line. Are you building a geocentric database? 2) Are your lat lon values in degrees or radians? The convertLatLongHeightToXYZ() method requires lat, lon radians. 3) Why is your traversal mask -1 in the computeHeightAboveTerrain()? Try removing the -1 from this call... Regards, -Shayne -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Murray G. Gamble Sent: Wednesday, November 24, 2010 2:19 PM To: [email protected] Subject: [osg-users] osgSim::HeightAboveTerrain not returning any hits Hi All, It's been a while. Good to be back. We have created a paged terrain database using VPB/OsgDem with geo-referenced GeoTIFF-based elevation data using the command: osgdem -d honolulu.tif --no-terrain-simplification -l 16 -o honolulu.ive This creates a very detailed terrain database against which we'd like to perform HAT queries. We build a simple scene graph using the following lines of code: osg::Node *wTerrainNode = osgDB::readNodeFile( "honolulu.ive" ); osg::Group *wRootNode = new osg::Group(); wRootNode->addChild( wTerrainNode ); osgViewer::Viewer *wViewer = new osgViewer::Viewer(); wViewer->setUpViewerInWindow( 100, 100, 800, 600 ); wViewer->setSceneData( wRootNode ); wViewer->realize(); osgSim::HeightAboveTerrain wHatTester; osg::CoordinateSystemNode *wCsn = dynamic_cast<osg::CoordinateSystemNode*>(wTerrainNode); wCsn->setEllipsoidModel( new osg::EllipsoidModel() ); We then use the following code to query HAT (in our main loop): wCsn->getEllipsoidModel()->convertLatLongHeightToXYZ( wLat, wLon, wHeight, wX, wY, wZ ); // where wLat, wLon, wAlt are dynamic, valid values within the terrain area being populated by our flight model double wHat = wHatTester.computeHeightAboveTerrain( wTerrainNode, osg::Vec3d( wX, wY, wZ ), -1 ); In each case wHat remains a constant value consistent with height above sea level (i.e., no hits are being generated against the terrain). We are also visualizing our observer position with the same lat/lon/alt values and observe a valid, correlated position, so we know that the terrain is loading and that the lat/lon/values being used for the HAT query are reasonable. Any thoughts as to why we're not getting any hits? Thank you, Murray _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Murray G. Gamble, CMSP Director of Modeling & Simulation VSIM / Advanced Cognitive Engineering (ACE) Lab 2227 V-SIM, Carleton University Ottawa, Ontario, K1S 5B6 off: 613.520.2600 x2475 cell: 613.298.0997 fax: 613.520.2539 e-mail: [email protected] <mailto:[email protected]> http://acelab.carleton.ca
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