Deleting points to break up a primitive.

[hopbin9]

Hi, got a problem.

I have a Circle SOP (arc type is open) set as a polygon and I want to delete every N'th point so that I have a dashed line circle.

So I Group every N'th point, but when I Blast SOP that group it deletes the points but it's still all one connected primitive with some missing points.

I want to delete the points and break it up into multiple primitives so it looks like a dashed line.

I can't seem to figure it out.

Thanks,

[Macha]

In a dissolve node you can write p0, p1, etc and delete segments.

It doesn't quite do what you want though and I'm thinking you could somehow split up your curve so that each segment is a curve.

[Macha]

In fact, if you make a circle line and use

0e1 0e3 0e5

as the group input in the dissolve node you can do it. There must be a more procedural way with this weird syntax though... Perhaps a little python string writing thing...

Edited January 19, 2012 by Macha

[Macha]

Maybe like so:

`pythonexprs("' '.join(['0e'+str(a*2) for a in range(100000)])")

Edited January 19, 2012 by Macha

[3dbeing]

circle Sop -> Delete/keep points checked -> add sop/polygon tab/Groups of npoints....

[hopbin9]

Thanks guys,

Both your methods worked perfectly.

[Dispel]

Is there a more general solution to this when you are deleting points in an irregular manner? I have a bunch of curves crisscrossing an area, have selected some points via a group, and want to delete them, breaking the curves at that point, but they just connect from their nearest remaining points.

Edited February 7, 2014 by Dispel

[SimonHarrisCo]

Checking in 6 years later to say that the way i found to do this was:

to find a way to group the edge (i used by length) and
use a dissolve sop on that edge

delete and blast wernt working, makes me think i need to go back and learn what these guys do under the hood a bit better. 

[Noobini]

On 1/19/2012 at 12:14 PM, hopbin9 said:

Hi, got a problem.

I have a Circle SOP (arc type is open) set as a polygon and I want to delete every N'th point so that I have a dashed line circle.

So I Group every N'th point, but when I Blast SOP that group it deletes the points but it's still all one connected primitive with some missing points.

I want to delete the points and break it up into multiple primitives so it looks like a dashed line.

I can't seem to figure it out.

Thanks,

nah...it's all in the add,

add to delete geo then reconstruct ....hint every 2 !! c'mon you can do it.

oh sheesh, this thread is older than father time...why did i even bother with it ? NFI.

Edited May 25, 2020 by Noobini