Paul Melis wrote on Thursday, March 12, 2009 9:33 AM: > Hi, > > While trying to debug a collegue's code that uses a dynamically updated > color array on a Geometry that uses VBOs I'm getting confused about VBO > support in OSG 2.8. > Given the attached simple .osg file (a single colored quad, flagged to > not use display lists, but to use VBOs) I can see with an OpenGL tracer > (bugle) that no VBO is actually used on my nvidia FX5200 system. The > quad is simply drawn using glVertex() and friends. Are there limitations > to when VBOs can be used? And, if so, is there a way to have OSG loudly > complain when a request for VBOs can not be satisfied? > > Similarly, the attached c++ test case is more in line with our original > code. It uses a color array that is updated each frame. The array is > flagged as dirty with a call to dirty(), but here also, no VBOs seem to > get used. > > Regards, > Paul > > PS glxinfo reports GL_ARB_vertex_buffer_object is supported, OpenGL > version is 2.1.0 NVIDIA 96.43.01
Binding PER_PRIMITIVE forces OSG out of fast path rendering, so I don't think it can use VBOs. Using OVERALL or PER_VERTEX instead allowed VBOs on my system. -- Bryan Thrall FlightSafety International bryan.thr...@flightsafety.com _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
