How many polygons can current 3D cards deal with smoothly(keeping the fps on about 100)?

THAT depends a lot on your code and what you''re doing. Are they unlit, untransformed, non-textured, non-perspective projected polys? Probably a LOT and still get 100fps easily. But if they''re lit, textured, filtered, projected, clipped, AND transparent, not quite so many. Worse, if we''re adding in pixel/vertex shaders.

A better way to ask this question is: "How many FPS (or better, seconds per frame) does my game get on current graphics hardware?" And you can answer that by testing on various platforms. Then you can optimize.

Otherwise, I can see no real way to say HOW many polys you can cram on the screen and maintain a constant frame rate.

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How many polygons can current 3D cards deal with smoothly(keeping the fps on about 100)?

It would be pretty hard to answer this question without a page of assumptions. Although, I have noticed a couple of games boosting about their engines being able too handle over 100,000 polygons. That said, I am not sure I could get my polygon count to that level with 100 fps?

Understanding is a three edged sword...