Twist SOP (2025) – Unable to close a Grid into a perfect Cylinder

[Snuweline]

"Hi everyone, I’m trying to perform a basic topological transformation: winding a simple Grid SOP (ZX Plane, 1x1) into a tube using the Twist SOP (Bend mode).

No matter which axis or pivot settings I try (including offsetting the Grid’s Center to 0.5 or using Pivot expressions), the ends don’t meet perfectly. I either get a teardrop shape (bending from the center) or a spiral (when offsetting the pivot).

It seems the 2025 version handles the Bounding Box or Strength scaling differently.

• How do I set the Twist SOP so that one edge stays fixed at the origin and the other edge meets it perfectly at 360 degrees to form a circle?

• Why does the Strength value of 271 seem to ‘close’ the shape instead of 360?

Any help on the correct axis/pivot logic for this specific build would be much appreciated!"

[Peeet]

I’m not sure why, but if you get the width of the grid as close as possible to zero, it will twist it into an almost perfect tube.

Also if you use two twists in a row but with different pivot points, you can also get very close, maybe close enough.

I think both of these demonstrate that the twist is working differently for verticies / points that are farther from the pivot point, so maybe the rolloff parameter has some say in this, but I couldn’t figure it out.

You might also have luck with the Lattice SOP, or, I was able to get pretty close with the Blend SOP as well:

Just have to use a carve SOP to open the U of the tube (and add an extra column to the grid SOP) so that they have the same number of points and same topology.