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Smoothstep[1] is a nice smooth alternative to cosine that doesn't require special math functons, and should thus be suitable on more platforms. The cosine-curve and the smoothstep are very similar, and this change introduces only a very small error (always less than 1 per cent) compared to the old result. Change the smooth curve definition to match this. [1]: http://en.wikipedia.org/wiki/Smoothstep