Hi, I am trying to visualise interest points in an image by drawing them as a '+' on top of the image. I used osg::Geometry to just draw the two single lines for every interest point, but it seems really slow. The image is updated on every frame from a webcam, so the interest points change on every frame.
I draw around 200 - 500 such interest points in the frame. I first tried creating 500 separate geodes, each with a single drawable that I position at the right place with an osg::PositionAttitudeTransform. These were all added to a group which I update on every frame, but it is running really slow ( I blame the interest points, because if they are removed by culling, the scene updates quite fast, but as soon as they come in to view again, it slows down to a crawl). I also tried to just generate a single geode with 500 drawables positioned appropriately but it is still slow. Before I moved to OSG, I was able to draw them at full framerate using standard OpenGL, so there must be some cotcha in OSG that I didn't pick up on. I based my geometry on somthing similar to the osggeometry example. Any help would be greatly appreciated! Thank you kindly, Morne
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