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Smoothing a variable in time

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Hi all, I have to smooth the value of a variable (x) over the time. The formula I''m using is: x = x*alpha + NewX*(1-alpha) with some smoothing parameter ''alpha'' in the interval [0,1]. This code is called once per frame, my problem is that the "smoothing velocity" of the variable clearly depends on frame rate. I have the time passed since last calculation. How can I use this time parameter to make sure that the smoothing velocity is always the same regardless of the framerate? Any idea? Thanks.

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