Hi Nikita, I know this post http://3dcgtutorials.blogspot.ru/2013/08/instancing-with-openscenegraph.html and I used it too. The way how I managed to have like 1000x1000 grid of a real model (at 60hz) using UpdateCallbacks was by having a Visitor to "compile" the model into one DrawArrays so you can draw the whole model with one call. I was grabbing the highest LOD in my visitor and the model was using a baked texture. The model was having like few thousands triangles. Give it a shot it should work. At least worked for me
Hope it helps, Cheers, Nick On Thu, Jan 21, 2016 at 10:03 AM, Nikita Petrov <[email protected]> wrote: > Hi, > > I will start from afar. > > I'm developing an application using osgEarth. The basic idea is to > visualize objects like aircrafts, cars, ships. These objects should move by > updating their coordinates and angles (pitch, roll, yaw). > > Currently I'm using an UpdateCallback on the group, containing all > aircrafts, to change position and rotation of the model. > > I decided to test the performance of this approach. I've added 10x10 grid > of aircrafts and in UpdateCallback started to rotate and move them. Results > are shown in the first screenshot. > > After that I decided to try the same idea in OSG witch osg:Box instead of > aircraft model. > I've added 100x100 grid of boxes and set the similar UpdateCallback on the > parent group. Results were 30-40 fps (see attached image). > > PC specification:NVIDIA GeForce GTX 580; > Intel Core i7-930; > 12GB DDR3-1333; > MS Windows 8.1 x64; > OpenSceneGraph Library 3.5.1 x86; > osgEarth Library 3.0.0 DEVELOPMENT () x86. > > I suppose I miss something, because I hope the frame rate should be higher > for 100 aircrafts on such PC. > I've found articles about GPU instancing ( > http://3dcgtutorials.blogspot.ru/2013/08/instancing-with-openscenegraph.html) > and example osgdrawinstanced in OSG. But as far as I understood it is > pretty hard to insert 3D model into this approach and it is not possible to > easily update position and rotation. > > Could you give me any suggestions about how to solve this problem? > > Nikita[/url] > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=66073#66073 > > > > > Attachments: > http://forum.openscenegraph.org//files/manyobjects_2_152.png > http://forum.openscenegraph.org//files/manyobjects_1_136.png > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- trajce nikolov nick
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