Re: [osg-users] Objects with (very) high mesh resolution not showing up in viewer?
Hi Preet, 48 rings and 72 This isn't a particular big mesh at all - the osgparametric example creates a 708x708 mesh for roughly 1 million triangles, it runs at a solid 60Hz on even my 8 year old laptop, so we can safely say that size of the mesh is not a problem. You'd have to have a pretty crappy graphics card and drivers not to be able scale up. What is the hardware?? The OSG viewer will automatically assign a TrackballManipulator when you call viewer.run() and this will set it's home position to the center of your model. As for the coordinates - it's certainly not ideal to use ECEF coords with floats, but all that should happen is you'll get a bit of jitter on the coordinate position. There are ways of solving this - a topic that has been discussed many times before here so just look in the archives for discussion about whole earth databases. Robert. On 1 March 2012 18:14, Preet prismatic.proj...@gmail.com wrote: I think it might be a scale issue wrt to the camera. I just found out about the OSG_NOTIFY_LEVEL env var, and I get a bunch of messages about the viewer's drawing traversal: cull_draw() 0x988f788 _clampProjectionMatrix not applied, invalid depth range, znear = 3.40282e+38 zfar = -3.40282e+38 end cull_draw() 0x988f788 I'm using large scaled units (ie, millions) in the scene. Maybe the geometry isn't within the camera's frustum, or something like that? I don't get why change the number of vertices that make up the geometry would cause a change like that though. I construct a spheroid using arguments for parameters that correspond to latitude / longitude style divisions. The latitude argument defines how many 'rings' go down one axis of the sphere, and the longitude argument defines how many 'sectors' each 'ring' is divided into. So if I specify 36 rings and 72 sectors for each ring, I expect my sphere to have (36*72) vertices. This works fine. If I up the ante to 48 rings and 72 sectors, osgViewer won't show the geometry. The function I call isn't doing anything special... and seems to complete fine before being sent to the viewer. http://pastie.org/3497231 - line 184 is where I defined the function. I'm going to Preet On Thu, Mar 1, 2012 at 7:00 AM, Sebastian Messerschmidt sebastian.messerschm...@gmx.de wrote: Hi Preet, can you give us some more details on the limit you are hitting here? Also I don't see any hints how your geometry is organized? As a single drawable? If the latter is the case, I guess you are simply hitting some OpenGL/Driver limits regarding the maximum size of a draw array. cheers Sebastian Hiya, I used OpenSceneGraph to generate some straightforward geometry; an ellipsoid representing the Earth. I wrote a function which calculated vertices, normals, texture coords and indices for the geometry. The function takes the number of 'sectors' and 'rings' as arguments to generate spherical geometry. It works fine until I hit some limit as I increase the resolution of the mesh (by passing a larger number of sectors and rings to the function), after which point osgviewer doesn't display the data. There aren't any errors; the geometry just doesn't show up in the viewer. If I go back beyond some threshold the geometry shows up again. What's going on? Regards, Preet ___ 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] Objects with (very) high mesh resolution not showing up in viewer?
Hiya, I used OpenSceneGraph to generate some straightforward geometry; an ellipsoid representing the Earth. I wrote a function which calculated vertices, normals, texture coords and indices for the geometry. The function takes the number of 'sectors' and 'rings' as arguments to generate spherical geometry. It works fine until I hit some limit as I increase the resolution of the mesh (by passing a larger number of sectors and rings to the function), after which point osgviewer doesn't display the data. There aren't any errors; the geometry just doesn't show up in the viewer. If I go back beyond some threshold the geometry shows up again. What's going on? Regards, Preet ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Objects with (very) high mesh resolution not showing up in viewer?
Hi Preet, can you give us some more details on the limit you are hitting here? Also I don't see any hints how your geometry is organized? As a single drawable? If the latter is the case, I guess you are simply hitting some OpenGL/Driver limits regarding the maximum size of a draw array. cheers Sebastian Hiya, I used OpenSceneGraph to generate some straightforward geometry; an ellipsoid representing the Earth. I wrote a function which calculated vertices, normals, texture coords and indices for the geometry. The function takes the number of 'sectors' and 'rings' as arguments to generate spherical geometry. It works fine until I hit some limit as I increase the resolution of the mesh (by passing a larger number of sectors and rings to the function), after which point osgviewer doesn't display the data. There aren't any errors; the geometry just doesn't show up in the viewer. If I go back beyond some threshold the geometry shows up again. What's going on? Regards, Preet ___ 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] Objects with (very) high mesh resolution not showing up in viewer?
I think it might be a scale issue wrt to the camera. I just found out about the OSG_NOTIFY_LEVEL env var, and I get a bunch of messages about the viewer's drawing traversal: cull_draw() 0x988f788 _clampProjectionMatrix not applied, invalid depth range, znear = 3.40282e+38 zfar = -3.40282e+38 end cull_draw() 0x988f788 I'm using large scaled units (ie, millions) in the scene. Maybe the geometry isn't within the camera's frustum, or something like that? I don't get why change the number of vertices that make up the geometry would cause a change like that though. I construct a spheroid using arguments for parameters that correspond to latitude / longitude style divisions. The latitude argument defines how many 'rings' go down one axis of the sphere, and the longitude argument defines how many 'sectors' each 'ring' is divided into. So if I specify 36 rings and 72 sectors for each ring, I expect my sphere to have (36*72) vertices. This works fine. If I up the ante to 48 rings and 72 sectors, osgViewer won't show the geometry. The function I call isn't doing anything special... and seems to complete fine before being sent to the viewer. http://pastie.org/3497231 - line 184 is where I defined the function. I'm going to Preet On Thu, Mar 1, 2012 at 7:00 AM, Sebastian Messerschmidt sebastian.messerschm...@gmx.de wrote: Hi Preet, can you give us some more details on the limit you are hitting here? Also I don't see any hints how your geometry is organized? As a single drawable? If the latter is the case, I guess you are simply hitting some OpenGL/Driver limits regarding the maximum size of a draw array. cheers Sebastian Hiya, I used OpenSceneGraph to generate some straightforward geometry; an ellipsoid representing the Earth. I wrote a function which calculated vertices, normals, texture coords and indices for the geometry. The function takes the number of 'sectors' and 'rings' as arguments to generate spherical geometry. It works fine until I hit some limit as I increase the resolution of the mesh (by passing a larger number of sectors and rings to the function), after which point osgviewer doesn't display the data. There aren't any errors; the geometry just doesn't show up in the viewer. If I go back beyond some threshold the geometry shows up again. What's going on? Regards, Preet ___ 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
