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How could I falloff an attribute based on a "Ramp"?

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I would like to falloff an attribute based on a RAMP, something like what I tried to explain in image bellow.
Is there any SOP to achieve this?

falloff to neighbor points.


Thanks for helping.


Edited by Masoud
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point wrangle for example (assuming you want it along x)

float u = relbbox(0, @P).x;
v@Cd = chramp("falloff", u);

otherwise it's up to you what coordinates you use for your ramp, it can be uvs that you generate beforehand, or some distance attribute from Falloff SOP spreading from point group or any other 

Edited by anim
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