To get ripples radiating from a center, base the sine function on the distance of the point to the center of the surface:
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To animate this, add a time-based variable to the expression:
sin(sqrt(($BBX-0.5)^2+($BBZ-0.5)^2)*720+$F*4)
Point节点中Position Y : sin(sqrt(($BBX-0.5)^2+($BBZ-0.5)^2)*1080-$F*4)*0.4
This creates a logarithmic spiral, reminiscent of nautilus shells.
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原文：http://www.cnblogs.com/peng-vfx/p/4782024.html