I presume the problem geometry has Normal's defined correctly ?
Best Regards Gordon __________________________________________________________ Gordon Tomlinson Email : [EMAIL PROTECTED] YIM/AIM : Gordon3dBrit MSN IM : [EMAIL PROTECTED] Website : www.3dscenegraph.com __________________________________________________________ "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 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Stephen Northcott Sent: Saturday, October 14, 2006 2:14 PM To: [email protected] Subject: [osg-users] Lighting / Shading problem on program generated models.. Hi all.. I am attempting to speed up a very large cluster of unit cubes which have been serving to model the 3D topography of a pipeline scan.. A typical Scene Graph has some 700,000 unit cubes in it, and millions of point sprites.. The clusters of unit cubes are still making this sloooooooow though (even with data optimization, and switching chunks in and out based on their distance to the viewer)! I have found that by generating the data for all the cubes using vertices and groups of Geometry objects that this approach is much faster. Up to twice as fast for the same data. Coupled with some useful suggestions given earlier in this mailing list I am now very happy using a hybrid of scaled point sprites to model data further away from the viewpoint.. alongside either the older unit cube method, or my new generated method. Unfortunately... My generated 'models' are very washed out in colour, and are not shaded, thus appearing flat. Compared to unit cubes in the same scene graph they are very bland indeed, and you cannot make out any definition at all. Similarly, if I try to change the render mode for point sprites, to say lines, I lose any lighting on the objects and they appear dull and dark. I have tried lots of different state set settings, as well as looking at the arrangement of my vertices in my geometry, just in case... I am confused and think this must be something to do with the way I cam creating the models, as I cannot see how other models in the same scene graph, at the same level in the tree, are all rendered perfectly shaded and lit. I am obviously missing something and wondered if anyone can tell me where my problem may lie.. To clarify for my generated models I have followed very closely the pyramid example distributed with OSG. Instead of making triangles I am making lots and lots of cuboids, and attaching a colour array. Thanks for any help.. Kind regards, Stephen. _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/ _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
