There's no guarantee of a current context during update. You could use a draw callback instead. Optionally, for the code you posted, I don't know why you don't just use an osg::Geometry object. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com <http://www.skew-matrix.com/> +1 303 859 9466
_____ From: [email protected] [mailto:[email protected]] On Behalf Of Claudio Arduino Sent: Monday, March 23, 2009 4:18 AM To: [email protected] Subject: [osg-users] Insert custom Open GL code Hi, i Need to insert custom OpenGl code like this: glBegin(GL_TRIANGLE_STRIP); glColor3f(1.0, 0.0, 1.0); glVertex3i(0,0,0); glColor3f(1.0, 0.0, 1.0); glVertex3i(2000,2000,0); glVertex3i(0, 2000,0); glEnd(); glFlush(); i have tried to insert this code in osgCallback code: struct DrawableUpdateCallback : public osg::Drawable::UpdateCallback { virtual void update(osg::NodeVisitor*, osg::Drawable* drawable) { std::cout<<"Drawable update callback "<<drawable<<std::endl; glBegin(GL_TRIANGLE_STRIP); glColor3f(1.0, 0.0, 1.0); glVertex3i(0,0,50); glColor3f(1.0, 0.0, 1.0); glVertex3i(20000,20000,50); glVertex3i(0, 20000,50); glEnd(); glFlush(); } }; the code is executed but the triangles don't appear to the screen... i am a newbie in OpenGl.... please help me...:-) thanks
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