Thinking about a real professional 3d game I was asking myself how the hell programmers can render in a devent frame rate so huge levels. I mean, think about a Quake or Half-Life or even Tomb Raider level. They are huge!!! They are made by millions of vertices and triangles. How can they render them smootly ? It must be a particular way to do it. They cam''t use glVertex3f() milions of times per every rendering loop. So, what is the solution ? Another question.... Does glDrawElements give a very good boost performance instead of using glVertex3f or not ? Now I''m using the glVertex3f method called ''n'' times where ''n'' is the number of my vertices. Should I pass to use glDrawElements or not ?