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
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