Hi John, >I want to design a way to detect which rendered object user is touching in the screen.
I would suggest to take a look at existing solutions: http://www.mvps.org/directx/articles/improved_ray_picking.htm ( it uses DX but explains an approach ) http://uncommoncode.wordpress.com/2010/09/22/select-objects-with-mouse-in-openscenegraph/ https://github.com/xarray/osgRecipes/blob/master/cookbook/chapter3/ch03_06/select_model.cpp( example fromOpenSceneGraph 3 Cookbook) Regards Sergey
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