what do people mean when they talk about realtime-rendering/shadowing etc. ?

The exact definition of real-time varies. Most often in game programming it means "able to be interactive." Generally a framerate of 30 FPS (frames-per-second) is considered interactive, because it''s close to the refresh rate of the human eye, allowing you to notice change occuring each frame.

Not the best explanation. If you need additinal clarification, just ask.

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for things like rendering and shadowning, it''s usualy used to mean it can be changed on the fly, like a moving light can cast shadows onto a wall, as opposed to the shadows being pre-computed, and never changing. like ZealousElixir said though, the exact definition varies

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Yeah, good clarification.

Real time rendering means that the scene is drawn as you see it. This means that things can easily be moved around and then the next time the scene is drawn, everything will be where you put it. On the other hand, pre-rendered scenes are drawn in advance and the images produced are stored on disk. Then when you need them, the images are simply copied to video memory. While this means that you lack the dynamic nature of real time rendering, this does mean that the length of time the render takes is insignificant. This means that you could show very high quality or complex images that would be just too slow under a real time system.

ok i get it, thx for all replies