hi recently i began to get confused when i see the words graphics engine and game engine i thought that a graphics engine is just a renderer that is capable of some features like multitexturing, shadows, ...etc(and rendering techniques) while a game engine is a graphics engine + other game techniques like collision detection, so could anybody tell me what''s the difference between those two words also if the words "graphics engine" and "renderer" could be used instead of each other thanx