I have some pretty knowledge on Vertex, GlOrtho, not lighting and not some advanced topics.
Is vertex and ortho knowledge enough to use the OGRE and irrlicht?

Depends on what you are trying to do. Are you wanting to design game levels, script, work on sound/music? If you're working on your own, you're gonna need at least a general working knowledge of how levels are compiled, how to integrate them with scripts etc.

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