My old nemesis, math

[Taehl]

This only will be computed once every ten seconds or so (or six times in one frame, then nothing for 15 seconds), so it's okay for it to be expensive. Here's my final result:

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local n = math.random()
n = (n + .1*math.tanh(1/(3*(n-1/3))) )%1

So, what's n? A random number which can't be too close to 1/3. Or, with a little perspective, flowers in my plant game can't start out green (but can still be bred to there).

Anyway, thanks for the help, everyone. I don't know what I'd do without you.

[kikito]

Just a small thing: it's considered polite to accept one of the answers they give you on any stackexchange site, even if it just "points you" to the right solution without being the exact answer.

You can accept an answer by clicking on the little "flag" on the left of it. You can accept only one answer, but you can "up-vote" (with the little up-down arrows) as many as you want.

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[ghostwriter]

Here's one that uses "normal" math functions. It hits a peak of 0.1 or -0.1 at x=1/3:

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y=0.1*(x-1/3)/abs(x-1/3)*(exp(-abs((x-1/3)*32)))

func.png (1.54 KiB) Viewed 770 times

You can "stretch" it by changing the 32 at the end. A lower value makes for a wider falloff, a larger number will make sharper falloff.