I simplified what I wanted to express in this VEX.
Using For loop, get the position of point one step before and create a new point that relatively adds the position,
and I try to create lines by connecting them.
In picture1, I realized getting the points by using “addpoint”, and connecting them by “addprim”.
In picture2, I wanted to do the same thing in single wrangle, but I couldn't get a point position by
point(geoself(), “P”, i)…
I don't know why this happens, and I want to know how to solve this in single wrangle.