Have you tried using the osgUtil::SmoothingVistor on the model when its loaded ? to see if this will solve your problem ? rendering both sides will lead to a different set of unwanted artifacts
Gordon __________________________________________________________ Gordon Tomlinson Product Manager 3D Email : gtomlinson @ overwatch.textron.com __________________________________________________________ (C): (+1) 571-265-2612 (W): (+1) 703-437-7651 "Self defence is not a function of learning tricks but is a function of how quickly and intensely one can arouse one's instinct for survival" - Master Tambo Tetsura ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of alessandro terenzi Sent: Monday, January 26, 2009 10:22 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Rendering double-sided surfaces. Problem is that the models that come to my application are already prepared by people that do not (and unfortunately won't) think about normals issues, so maybe the best thing to do would be to really render both front and back faces, I'm not an expert, but the only approach I can think is to double the geometry so to have both faces, but it would be really a waste (not to mention performace problems that may arise..and other unexpected visualization problems I cannot think of..) Regards. Alessandro On Mon, Jan 26, 2009 at 1:37 PM, Tomlinson, Gordon <[email protected]> wrote: your triangles all need to be wound the same way (anticlockwise by default for OSG & Opengl), whether or not your normal's are correct The easiest fix would be to ensure that your modeling package sets up correct normal's before you get to OSG Assuming your triangles are wound the same way ( if not you will have to fix that ) try using the SmoothingVistor on the data see include\osgUtil\SmoothingVisitor Gordon __________________________________________________________ Gordon Tomlinson Product Manager 3D Email : gtomlinson @ overwatch.textron.com __________________________________________________________ (C): (+1) 571-265-2612 (W): (+1) 703-437-7651 "Self defence is not a function of learning tricks but is a function of how quickly and intensely one can arouse one's instinct for survival" - Master Tambo Tetsura ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of alessandro terenzi Sent: Monday, January 26, 2009 7:09 AM To: OpenSceneGraph Users Subject: [osg-users] Rendering double-sided surfaces. Sometimes my application has to load models that have normals not always oriented in the same coherent way, so it is not always possible to say that a surface is oriented in a way or in another and my renderings do not look correct. I'd like to fix this problem in some way...so I was thinking about rendering both front and back faces, but how do I ask OSG do this? Or perhaps, is there another way/technique to achive the same result? (ie. orient a surface in a coherent way: all faces inward XOR outward) Thank you. Alessandro _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g
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