Thanks Robert/Shayne, turns out I was computing HAT correctly but was using wrong texture filtering ( I store the positions in a texture ). thus the computed heights were displayed incorrectly in the vert shader.
Thanks again. On 09/08/2010 12:27 AM, Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC wrote: > Paul, > > For HAT, you only need one point. LOS requires a start and end point. Both > require that the points be specified in the database coordinates (i.e. > geocentric Cartesian coordinates for round earth databases). > > I haven't worked with .flt databases but the osgSim methods appear to work > for paged databases built by VPB... > > -Shayne > > -----Original Message----- > From: osg-users-boun...@lists.openscenegraph.org > [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Paul Pocock > Sent: Thursday, September 02, 2010 11:06 PM > To: osg-users@lists.openscenegraph.org > Subject: [osg-users] Compute Terrain Intersection for .flt > databases[SEC=UNCLASSIFIED] > > Hi - Whats the best way to get the z down intersect point onto a paged > database. I'm getting what looks like loss of precision errors. I am not > sure if it is because I am using osgUtil::IntersectVisitor (Which I > believe is deprecated?) or my lack of knowledge of > osgSim::HeightAboveTerrain. Is it my proper understanding that I provide > two points x,y,z (beginning and end) for HAT? Even doing this gives some > very strange results... Is there a very basic example out there to > achieve this? Is it a trivial problem? > > Regards > Paul > > > > IMPORTANT: This email remains the property of the Department of Defence and > is subject to the jurisdiction of section 70 of the Crimes Act 1914. If you > have received this email in error, you are requested to contact the sender > and delete the email. > _______________________________________________ > 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 >
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