http://www.opengl.org/discussion_boards/ubbthreads.php Developers - Math and Algorithms OpenGL.org Discussion and Help Forums - UBB.threads(tm) http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274208#Post274208 Posted by ZbuffeR:
No, two sided lighting allow 2 different material, and selected according to normal direction, not CW or CCW winding. You have to disable backface culling however.]]> Wed, 17 Mar 2010 12:11:36 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274176#Post274176 Posted by ZbuffeR:
Keywords : toon OR cel OR cartoon shader glsl Read this and following pages : http://www.lighthouse3d.com/opengl/glsl/index.php?toon Drawing black edges or stroke outlines can be done too.]]> Wed, 17 Mar 2010 03:38:13 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=273912#Post273912 Posted by nickels:
You might try taking a look at the Wild Magic library. He has routines for going back and forth between quaternions, rotation matrices and euler angles. Relevant files are: http://www.geometrictools.com/LibFoundation/Mathematics/Wm4Quaternion.]]> Sun, 14 Mar 2010 11:01:10 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=273605#Post273605 Posted by ZbuffeR:
Hardware GPUs only display triangles. Any other primitive must be described with triangles by the CPU program. Maybe you had something else in mind, like GLU tesselation ? http://glprogramming.com/red/chapter11.html There is an open source im]]> Wed, 10 Mar 2010 04:51:53 CST http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=273515#Post273515 Posted by strattonbrazil:
Um, not sure the name of whatever you're trying to do, but I think I can help. Several papers try to build polygons from a point curve. It's very common for art programs like photoshop. One paper you might want to read is "Skeletal Strokes". You ]]> Mon, 08 Mar 2010 13:10:19 CST http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=273377#Post273377 Posted by SimoPI:
Thanks, i think i found a good solution, taking yours comments :)]]> Thu, 04 Mar 2010 19:27:35 CST http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=273264#Post273264 Posted by maedhros777:
Thanks for all your answers, I knew there must have been something wrong with values like "5.95171e-39" and "NaN" in an OpenGL matrix.]]> Wed, 03 Mar 2010 16:08:40 CST http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=273251#Post273251 Posted by typewriter:
Thanks for your input! I've been working with this for a few days now. I wanted to come back here with a resounding success story complete with beautiful screen shots, but.. I haven't solved this, and I'm not sure if I'm misunderstanding you or th]]> Wed, 03 Mar 2010 14:12:55 CST http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=272855#Post272855 Posted by Ilian Dinev:
Thanks a lot! This did exactly what I wanted. Will need to be used together with glViewport() and optionally scissors, just as I hoped. ]]> Thu, 25 Feb 2010 15:40:40 CST http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=272793#Post272793 Posted by Lefteris:
Thanks zbuffer. Both are very nice thoughts. Especially the one with the subdivision. I will try that one first to see how it works out :)]]> Thu, 25 Feb 2010 03:44:49 CST