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VEX: Adding pts inbetween pts (and shifting point IDs)

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Florian Thamer
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Hi there,
Lets say I have a straight line with points 1, 2, 3, 4
I want to add a point between 2 and 3

If I simply use addpoint(0, newPosition) I'll get 1, 2, 5, 3, 4

Is there a way of adding a point inbetween 2 and 3 so that the IDs after point 2 increase?

I imagine splitting the array of all points in 2, adding my new array of points and then connecting all 3 together again.
How would I go about that? I think I'm just missing the name of the array that contains all points in my geo, any clues?

Thanks so much in advance!
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N-G
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Greeting!
You can't do this straightly in VEX, instead you can create your point afterward use Sort SOP to resort point numbers based on an attribute.
See the following HIP file.

Attachments:
Line Point Rename.hip (93.0 KB)

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tamte
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Florian Thamer
I think I'm just missing the name of the array that contains all points in my geo, any clues?
you can use primpoints() to get that array for any prim

so in case you are ultimately after inserting a new point into the existing line
here is a simple case in Primitive Wrangle, just be aware that because the old prim is destroyed and replaced with a new one, the prim attributes will not persist so you may need to manage them separately, as well as intrinsics like 'closed':

int pts[] = primpoints(0, @primnum); //get all points of current prim

vector newP = {1,1,1}; //figure out new point's position
int newpt = addpoint(0, newP); // create new point

int index = 2;
insert(pts, index, newpt); // insert new point to desired location
removeprim(0, @primnum, 0); // delete incoming prim
addprim(0, "polyline", pts); // and create new one from new array of points

the new point will still be highest ptnum
but you can use Sort Sop in By Vertex Order to fix that
Edited by tamte - Feb. 12, 2021 12:12:27
Tomas Slancik
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Method Studios, NY
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