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Limiting RelaxSOP to X & Z

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This may have an easy answer but I am struggling to find it. 

I want to use point relax but I don't want it to affect the Y position. 
So my thought process is that I would go over all points before the relax and save the Y position. Then after the relax I would call back the Y positions and have them revert to their "original" value. 

The problem is that I can't figure out how to do this. Could anyone help?

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You don't need to do any post processing. Point Relax's 2D relaxation does support some constraints. You can set @N to:

{0, 1, 0}

which is in local space. If you turn on Use Normal Attribute, it won't displace the Y component.


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