The moving distance of the curve influence point,Make a wave effect

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I want to make the effect like the picture, but I can’t always do it exactly the same. Can you help me solve this problem?

Hi,

I’m not at my computer. So, I try to explain to you with the images.





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Also check this video: Quick and Easy Parametric Facades with Grasshopper - Beginner Tutorial - YouTube
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Cheers,
BVR