hi Oliver, GL_POLYGON mode is only for convex polygons, so GL_TRIANGLE_FAN is a working replacement.
Concave forms are not handled by OpenGL, you have to convert them to triangles beforehand using tesselators. regards Ralph Charles, Oliver schrieb: > @Ralph Kern: > > Thank you for your support! But GL_TRIANGLE_FAN only works with convex > polygons. > Do you or does anyone else know what to do if the polygon is concave? > > regards Oliver & Andreas > >> -----Ursprüngliche Nachricht----- >> Von: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] Im Auftrag >> von Ralph Kern >> Gesendet: Dienstag, 22. Januar 2008 13:11 >> An: [email protected] >> Betreff: Re: [osg-users] opengl to opengles >> >> I don't know if porting of OSG to OpenGL ES is really >> feasible, but at last I can give you one hint: >> >> You can easily replace GL_POLYGON mode by GL_TRIANGLE_FAN. >> >> regards Ralph >> >> Charles, Oliver schrieb: >>> Hello, >>> >>> We try to port openscenegraph to a device where only opengl es is >>> available. >>> Does anyone know if this was tried before? And if - if the >> sources are >>> available? >>> If not - does anyone have experience or any hints with >> porting opengl >>> applications to opengl es? >>> The problem in detail is that many of the opengl functions used by >>> openscenegraph are not available on opengl es , eg >> GL_POLYGON, Shading >>> or any functions introduced in OpenGl 2.0. Is there any well >>> performing algorithm to replace for example GL_POLYGON with >> eg GL_TRIANGLES (etc). >>> Any hints would be helpful. >>> >>> >>> With best regards >>> Oliver and Andreas >>> >>> ******************************************* >>> Diese E-Mail enthaelt vertrauliche und/oder rechtlich >> geschuetzte Informationen. Wenn Sie nicht der richtige >> Adressat sind oder diese E-Mail irrtuemlich erhalten haben, >> informieren Sie bitte sofort den Absender und loeschen Sie >> diese Mail. Das unerlaubte Kopieren sowie die unbefugte >> Weitergabe dieser Mail ist nicht gestattet. >>> >>> This e-mail may contain confidential and/or privileged >> information. If you are not the intended recipient (or have >> received this e-mail in error) please notify the sender >> immediately and delete this e-mail. Any unauthorized copying, >> disclosure or distribution of the contents in this e-mail is >> strictly forbidden. >>> ******************************************* >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscen >> egraph.org >> >> > > ******************************************* > Diese E-Mail enthaelt vertrauliche und/oder rechtlich geschuetzte > Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail > irrtuemlich erhalten haben, informieren Sie bitte sofort den Absender und > loeschen Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte > Weitergabe dieser Mail ist nicht gestattet. > > This e-mail may contain confidential and/or privileged information. If you > are not the intended recipient (or have received this e-mail in error) please > notify the sender immediately and delete this e-mail. Any unauthorized > copying, disclosure or distribution of the contents in this e-mail is > strictly forbidden. > ******************************************* _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
