Non consistent point numbers after Vellum Grains Sim

[juangoretex]

I've got a Vellum Grains sim where all the @ptnum's change every 20th frame.
Tried to set my own i@id = @ptnum attribute but it ends up changing with the point number too. Even if I timeshift freeze it and reference it afterwards.

The amount of points stay consistent, there are no keyframes or anything special on each 20th frame, I've tried both the Minimal and the Full solver to no avail.

It's not possible to export @id attributes from the solver right?
How does one get consistent point numbers from a Vellum sim? I'm happy to share the project file too if that helps.

Thanks in advance!

[Librarian]

@juangoretex Share that File Please.

 

[juangoretex]

13 minutes ago, Librarian said:

@juangoretex Share that File Please.

 

Hey thanks! I actually figured it out.

For future reference:

Ended up creating my own @id based on position.
Added a i@id = @ptnum; attribute on the cached points, then I ran this inside a SOP Solver with the previous frame connected to the #1 input and current to #0.

vector pos = @P;
int near = nearpoint(1, pos);
if (near != -1)
{
  i@id = point(1, "id", near);
}
else
{
  i@id = -1;
}