Re: [osg-users] Getting height data of a terrain(flt file)
Hi Bob, (gotta realize that Gordon and I have worked at Multigen-Paradigm, so we have a unique perspective on the Flight format ;-) -- mew On Wed, Mar 2, 2011 at 2:56 PM, Buckley, Bob CTR MDA/DES bob.buckley@mda.mil wrote: Wow, seemed to be pretty straight forward stuff to me. And the specs were always through and complete. It's the versioning I had trouble with. SDK available for it, too: http://www.presagis.com/products_services/standards/openflight/ -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tomlinson, Gordon Sent: Wednesday, March 02, 2011 6:10 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Getting height data of a terrain(flt file) You can get the latest spec for OpenFlight here http://www.presagis.com/products_services/standards/openflight/ Chris I always found a good aged bottle of single Malt stopped me crying when working with OpenFlight or a goo firkin of real ale :) Gordon Tomlinson 3D Technology System Engineering Consultant Overwatch® An Operating Unit of Textron Systems __ WARNING: Documents that can be viewed, printed or retrieved from this E-Mail may contain technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C., Sec 2751, et seq,) or the Export Administration Act of 1979, as amended, Title 50, U.S.C., App. 2401 et seq. and which may not be exported, released or disclosed to non-U.S. persons (i.e. persons who are not U.S. citizens or lawful permanent residents [green card holders]) inside or outside the United States, without first obtaining an export license. Violations of these export laws are subject to severe civil, criminal and administrative penalties. -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Chris 'Xenon' Hanson Sent: Tuesday, March 01, 2011 10:53 PM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Getting height data of a terrain(flt file) On 3/1/2011 7:54 PM, Mukund Keshav wrote: Hi Robert, Thanks for the reply. Could you please tell where i can find the exact file format for flt files? FLT isn't really an OSG format, it's a MultiGen format. Documentation on it is very poor and sparse. I wouldn't pursue this unless you REALLY need to look into the format. Grown men have been known to be reduced to tears trying to understand FLT. Thanks, Mukund -- 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 ___ 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 -- Mike Weiblen -- Black Hawk, Colorado USA -- http://mew.cx/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Getting height data of a terrain(flt file)
Ahhh. Marcus was da man for all us end users. -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Michael Weiblen Sent: Thursday, March 03, 2011 8:16 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Getting height data of a terrain(flt file) Hi Bob, (gotta realize that Gordon and I have worked at Multigen-Paradigm, so we have a unique perspective on the Flight format ;-) -- mew On Wed, Mar 2, 2011 at 2:56 PM, Buckley, Bob CTR MDA/DES bob.buckley@mda.mil wrote: Wow, seemed to be pretty straight forward stuff to me. And the specs were always through and complete. It's the versioning I had trouble with. SDK available for it, too: http://www.presagis.com/products_services/standards/openflight/ -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tomlinson, Gordon Sent: Wednesday, March 02, 2011 6:10 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Getting height data of a terrain(flt file) You can get the latest spec for OpenFlight here http://www.presagis.com/products_services/standards/openflight/ Chris I always found a good aged bottle of single Malt stopped me crying when working with OpenFlight or a goo firkin of real ale :) Gordon Tomlinson 3D Technology System Engineering Consultant Overwatch® An Operating Unit of Textron Systems __ WARNING: Documents that can be viewed, printed or retrieved from this E-Mail may contain technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C., Sec 2751, et seq,) or the Export Administration Act of 1979, as amended, Title 50, U.S.C., App. 2401 et seq. and which may not be exported, released or disclosed to non-U.S. persons (i.e. persons who are not U.S. citizens or lawful permanent residents [green card holders]) inside or outside the United States, without first obtaining an export license. Violations of these export laws are subject to severe civil, criminal and administrative penalties. -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Chris 'Xenon' Hanson Sent: Tuesday, March 01, 2011 10:53 PM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Getting height data of a terrain(flt file) On 3/1/2011 7:54 PM, Mukund Keshav wrote: Hi Robert, Thanks for the reply. Could you please tell where i can find the exact file format for flt files? FLT isn't really an OSG format, it's a MultiGen format. Documentation on it is very poor and sparse. I wouldn't pursue this unless you REALLY need to look into the format. Grown men have been known to be reduced to tears trying to understand FLT. Thanks, Mukund -- 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 ___ 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 -- Mike Weiblen -- Black Hawk, Colorado 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 mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Getting height data of a terrain(flt file)
You can get the latest spec for OpenFlight here http://www.presagis.com/products_services/standards/openflight/ Chris I always found a good aged bottle of single Malt stopped me crying when working with OpenFlight or a goo firkin of real ale :) Gordon Tomlinson 3D Technology System Engineering Consultant Overwatch® An Operating Unit of Textron Systems __ WARNING: Documents that can be viewed, printed or retrieved from this E-Mail may contain technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C., Sec 2751, et seq,) or the Export Administration Act of 1979, as amended, Title 50, U.S.C., App. 2401 et seq. and which may not be exported, released or disclosed to non-U.S. persons (i.e. persons who are not U.S. citizens or lawful permanent residents [green card holders]) inside or outside the United States, without first obtaining an export license. Violations of these export laws are subject to severe civil, criminal and administrative penalties. -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Chris 'Xenon' Hanson Sent: Tuesday, March 01, 2011 10:53 PM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Getting height data of a terrain(flt file) On 3/1/2011 7:54 PM, Mukund Keshav wrote: Hi Robert, Thanks for the reply. Could you please tell where i can find the exact file format for flt files? FLT isn't really an OSG format, it's a MultiGen format. Documentation on it is very poor and sparse. I wouldn't pursue this unless you REALLY need to look into the format. Grown men have been known to be reduced to tears trying to understand FLT. Thanks, Mukund -- 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 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Getting height data of a terrain(flt file)
Thanks Chris, Andreas, Gordon. @Andreas. However, if you want to extract a regular terrain height raster from an OpenFlight database, I would say the best solution is to write an OSG application that simply intersects vertically with the terrain at equal distances and puts the result in a raster that you write to disk The method you suggested sounded interesting. Could you please elaborate a little more? i understood till the part where i can make the terrain intersect with say equidistant lines. But after that, i did not get you. Could you please explain? Thanks for the support, Mukund -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37250#37250 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Getting height data of a terrain(flt file)
Hi Mukund, I just meant that you could implement a spatial traverse over the terrain bounding box with equal steps in X and Y, intersect vertically with the terrain and put the resulting terrain heights in an image which you can write to disk with one of the OSG image plugins implementing writeImage. If an elevation raster on disk is what you want, that is. Regards, Andreas On 2 mar 2011 14:37 Mukund Keshav osgfo...@tevs.eu osgfo...@tevs.eu wrote: Thanks Chris, Andreas, Gordon. @Andreas. However, if you want to extract a regular terrain height raster from an OpenFlight database, I would say the best solution is to write an OSG application that simply intersects vertically with the terrain at equal distances and puts the result in a raster that you write to disk The method you suggested sounded interesting. Could you please elaborate a little more? i understood till the part where i can make the terrain intersect with say equidistant lines. But after that, i did not get you. Could you please explain? Thanks for the support, Mukund -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37250#37250 ___ 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] Getting height data of a terrain(flt file)
Thanks again Andreas, im pretty new to OSG. im missing something here. intersect vertically with the terrain and put the resulting terrain heights in an image Now, how does the intersection yield me a heightmap? or a elevation data? If an elevation raster on disk is what you want, that is. Yes, that is precisely what im looking forward to obtain. But how will intersecting the terrain give the pixels which i can use for an elevation raster? Could you please exlpain? Thanks, Cheers, Mukund -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37258#37258 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Getting height data of a terrain(flt file)
Hi Mukend, On Wed, Mar 2, 2011 at 6:00 PM, Mukund Keshav osgfo...@tevs.eu wrote: Now, how does the intersection yield me a heightmap? or a elevation data? You build yourself a heightmap for a series of height queries. The osgintersection and osgpick example provides and examples of how to do ray intersections with the scene. If an elevation raster on disk is what you want, that is. Yes, that is precisely what im looking forward to obtain. But how will intersecting the terrain give the pixels which i can use for an elevation raster? Could you please exlpain? I think you are rather laking in understanding of OpenFlight and height fields as well the OSG. Rather than trying to teach you your job perhaps you might want to try and explain why you think your need an elevation raster, what are you trying to do here? It may well be that you are heading in totally the wrong direction, but I have no way of knowing other than what you have written in rather confused manner so far. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Getting height data of a terrain(flt file)
Hi Mukund, On Wed, Mar 2, 2011 at 7:16 PM, Mukund Keshav osgfo...@tevs.eu wrote: Well, in my application/project, i would want to know the gradients at places, ie how the terrain slope is varying. To do this, won't we need a heightmap? from which we can calculate the varying gradient? You won't need a height map at all :-) The ray intersections that osgUtil::InteresectionVisitor/osgUtil::LineSegmentIntersector provide intersection information on the position and local normal of the surface as well as the node path to the geometry leaf being intersected. Have a look at the osgintersection and osgpick examples. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Getting height data of a terrain(flt file)
You won't need a height map at all :-) Wow! Cool! Was breaking my head over this! il look into them. Thanks a lot! i just looked into osgIntersection. Mukund -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37263#37263 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Getting height data of a terrain(flt file)
Wow, seemed to be pretty straight forward stuff to me. And the specs were always through and complete. It's the versioning I had trouble with. SDK available for it, too: http://www.presagis.com/products_services/standards/openflight/ -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tomlinson, Gordon Sent: Wednesday, March 02, 2011 6:10 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Getting height data of a terrain(flt file) You can get the latest spec for OpenFlight here http://www.presagis.com/products_services/standards/openflight/ Chris I always found a good aged bottle of single Malt stopped me crying when working with OpenFlight or a goo firkin of real ale :) Gordon Tomlinson 3D Technology System Engineering Consultant Overwatch® An Operating Unit of Textron Systems __ WARNING: Documents that can be viewed, printed or retrieved from this E-Mail may contain technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C., Sec 2751, et seq,) or the Export Administration Act of 1979, as amended, Title 50, U.S.C., App. 2401 et seq. and which may not be exported, released or disclosed to non-U.S. persons (i.e. persons who are not U.S. citizens or lawful permanent residents [green card holders]) inside or outside the United States, without first obtaining an export license. Violations of these export laws are subject to severe civil, criminal and administrative penalties. -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Chris 'Xenon' Hanson Sent: Tuesday, March 01, 2011 10:53 PM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Getting height data of a terrain(flt file) On 3/1/2011 7:54 PM, Mukund Keshav wrote: Hi Robert, Thanks for the reply. Could you please tell where i can find the exact file format for flt files? FLT isn't really an OSG format, it's a MultiGen format. Documentation on it is very poor and sparse. I wouldn't pursue this unless you REALLY need to look into the format. Grown men have been known to be reduced to tears trying to understand FLT. Thanks, Mukund -- 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 ___ 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
[osg-users] Getting height data of a terrain(flt file)
Hello Everyone, im using .flt files to load terrain. i loaded a sample terrain from the OSG data.(Joedirt.flt). i was wondering if there is a way to obtain the heightfield/heightmap for the terrain? i googled for .flt file format. i could not get any information on it. Could ot be a closed format? Could anyone please suggest how i could obtain the height data? Thanks, Mukund -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37228#37228 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Getting height data of a terrain(flt file)
Hi Mukend, OpenFlight just stores terrain and meshes, not height fields. Robert. On Tue, Mar 1, 2011 at 7:08 PM, Mukund Keshav osgfo...@tevs.eu wrote: Hello Everyone, im using .flt files to load terrain. i loaded a sample terrain from the OSG data.(Joedirt.flt). i was wondering if there is a way to obtain the heightfield/heightmap for the terrain? i googled for .flt file format. i could not get any information on it. Could ot be a closed format? Could anyone please suggest how i could obtain the height data? Thanks, Mukund -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37228#37228 ___ 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] Getting height data of a terrain(flt file)
Hi Robert, Thanks for the reply. Could you please tell where i can find the exact file format for flt files? Thanks, Mukund -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37234#37234 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Getting height data of a terrain(flt file)
On 3/1/2011 7:54 PM, Mukund Keshav wrote: Hi Robert, Thanks for the reply. Could you please tell where i can find the exact file format for flt files? FLT isn't really an OSG format, it's a MultiGen format. Documentation on it is very poor and sparse. I wouldn't pursue this unless you REALLY need to look into the format. Grown men have been known to be reduced to tears trying to understand FLT. Thanks, Mukund -- 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
Re: [osg-users] Getting height data of a terrain(flt file)
Hi Mukund, OpenFlight is quite complicated yes, but actually more well documented nowadays. However, if you want to extract a regular terrain height raster from an OpenFlight database, I would say the best solution is to write an OSG application that simply intersects vertically with the terrain at equal distances and puts the result in a raster that you write to disk. Also, this would of course be a general file format-agnostic solution. Regards, Andreas On 2 mar 2011 04:53 Chris 'Xenon' Hanson xe...@alphapixel.com xe...@alphapixel.com wrote: On 3/1/2011 7:54 PM, Mukund Keshav wrote: Hi Robert, Thanks for the reply. Could you please tell where i can find the exact file format for flt files? FLT isn't really an OSG format, it's a MultiGen format. Documentation on it is very poor and sparse. I wouldn't pursue this unless you REALLY need to look into the format. Grown men have been known to be reduced to tears trying to understand FLT. Thanks, Mukund___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
