I have a nurbs curve that changes its number of points from frame to frame. Can I force a curve to have a specific number of points (after the animation)?

Try using Re-Sample… I can't guarantee success, but it's a good place to start!

Cool, thanks. With a simple expression and a sort it works.

Resampling nurbs curves this way converts them to polygons. Refine (unrefine) sop is the different approach, but I still have no clue how to determined exact number of points there.

kuba
Resampling nurbs curves this way converts them to polygons. Refine (unrefine) sop is the different approach, but I still have no clue how to determined exact number of points there.

I don't have H here now but if I remember correctly: append refine SOP and then set first u point to 0, and second to 1 (beginning and end). You should be able to work out how the total point numbers are related to subdivision. I think it was points = npt + (u-2) or something like that. You set p to a value that is 2 higher than the maximum you'll ever get in your curve, solve the equation accordingly, and that way you'll always retain the same number of points.

Thanks for the tip. Unfortunately you can only Refine it (increasing number of points). If I need to rebuild Nurbs curve by decreasing the number - Resample SOP is the only way to go. Unfortunatelly Unrefine can't be set up to control final number of points.
In the end maybe Resample SOP is the best way for that since it evenly distributes points on the curve… and you anyway tweak the final shape afterwords.

Cheers,
Kuba

I'm wondering if this may be a case for Python.

I know we can make NURBS curves from points. I assume we can delete, but refine and such? Perhaps a greater mind than mine (hello Graham!) knows if this could be scripted.

Try maybe this:

what about using
Resample SOP followed by Fit SOP (interpolation method) ?