[CP2K-user] [CP2K:17478] How to define a plane thru its normal vector

alh chin alhchin at gmail.com
Mon Aug 15 03:01:16 UTC 2022

Dear all. 

I am working on a metadynamics study. I want to define a collective 
variable as the distance from an atom to a plane.  I have two questions:
(1) one can define a plane by its normal vector,  see

NORMAL_VECTOR {Real} {Real} {Real}
*Alternatively to 3 atoms/points one can define one of the two, planes by 
defining its NORMAL vector.*  

*my question*: since it's not a fixed vector, how to define a fixed plane?

(2)the manual emphasizes that 
*"At least one plane must be defined through atoms."*

*my question*: for what reason at least one plane must be defined thru 
atoms? why can't I define all planes thru normal vectors?


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