How to make a part smoothing tool

So i have no idea how to do this. I was able to make a sculpting tool (which increases or decreases the height of a part in the brush size), but I literally have no idea how to make a smoothing one. Can someone help? I tried to find a tutorial, but i was not able to find one.

Try getting the average of each part’s neighbors’ heights in the smoothing range and setting that to the part’s height.

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