When I create a cage (either with cage or with cageedit) for a part that is planar, in most cases Rhino creates a UV cage instead of the XYZ cage I get when the part is not planar (otherwise, I’d end up with stacked cage points, so this makes sense.) The main issue for me is when I’m scripting a cag…

Hi @phcreates , Thanks for the file — I can reproduce it. It’s a precision quirk in some old bounding box code: on a flat surface or polysurface the box can come out very slightly non-flat, so you get an XYZ cage. Curves and SubDs don’t hit it. Whether it happens depends on where the object sits, w…

Anyone have any ideas? Also, I don’t see any documentation of these two types of cages in the help files. Maybe I’m missing them?

Hi @phcreates , Yes, you can force a 3-D cage. In CageEdit, at the Select control object prompt pick Box, then at the box’s first-corner prompt pick BoundingBox. You still get the automatic bounding box around your selection, but this path always gives you an XYZ cage — if the box is flat in one dir…

Hi Dale, Thanks for that detail - it’s very helpful. Here’s an example of 3 types of objects that are all planar, but only the surface gives me an XYZ cage. cage issue.3dm (83.6 KB)

This isn’t exactly a solution to the question I asked, but it solves my issue anyway. Apparently someone helped me solve this at some point in a different script (I’m assuming, b/c I don’t think I figured it out myself!) by passing both XYZ and UV parameters to Rhino, like this: strCommandText = ‘!…

@dale Were you able to reproduce that cage issue using that example?

Hi @dale 2 maybe related bugs: Using that ‘cage issue’ example file above, if I change the model units to Inches, then running cage edit on the surface gives me the expected UV cage (see attached example.) Why would it be different than when units are set to mm? That macro I created doesn’t work q…

Hi @phcreates , Same issue as before. The precision error grows with distance from the origin, and converting to inches moves your surface about 25× closer to it, which is enough to keep the box flat. You found a real bug. CageEdit checks the wrong option when you change VDegree on a flat cage, so …

Force cage to use XYZ instead of UV?

Rhino Rhino for Windows

brian (Brian Gillespie) October 13, 2026, 9:56pm 10

RH-99200 is fixed in Rhino BETA

Topic		Replies	Views
Cage parameters Rhino for Windows	4	1101	February 26, 2018
Cage BoundingBox CPlane Bug Rhino for Windows windows	2	280	January 15, 2021
UV Editor and CageEdit Serengeti (Rhino BETA) windows	3	362	October 9, 2023
!_Cage wrong by curve Rhino for Windows windows	7	761	August 23, 2022
BUG: CageEdit Rhino for Windows	1	306	May 18, 2018

Force cage to use XYZ instead of UV?

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