I’ve wondered since shortly after starting using Rhino, why there is not an option for Rotate3D to set the axis to a line. It seems like it would be pretty straight forward to have the tool set the rotate axis to the two points of the line. Quite often I find myself rotating a part on its edge and t…

Hi Ryan - [image] Ryan Hammer: It seems like it would be pretty straight forward to have the tool set the rotate axis to the two points of the line. I’ve written that up as RH-90365 Rotate3D: Allow Picking Curve -wim

rhinopython/spb_Rotate3D.py at master · CADacombs/rhinopython · GitHub is a script that wraps _Rotate3D with an added option to derive the rotation axis from a line, arc (through its center and normal to its plane), cylinder, cone, or torus. (The UseLastAxis option is not included.)

[image] wim: I’ve written that up as RH-90365 Rotate3D: Allow Picking Curve Thank you, I appreciate it. [image] spb: rhinopython/spb_Rotate3D.py at master · CADacombs/rhinopython · GitHub is a script that wraps _Rotate3D with an added option to derive the rotation axis from a line. . . …

@KelvinC Using a line as Axis is great. I do not understand the concept of using a startpoint-Endpoint Axis from a Curve. Is there a typical use case i miss ? For a curve i would expect that same behavior as for _cplane _curve select the curve, select a point on the curve, the tangent will beco…

@Tom_P [image] Tom_P: I do not understand the concept of using a startpoint-Endpoint Axis from a Curve. Is there a typical use case i miss ? This was requested by @wim in the initial report of RH-90365 . He would be the best person to answer your question.

Sorry for the late response I just found this as a draft response I never submitted. My main objective was to gain access to straight lines and segments. Off the top of my head, I can’t really think of how I would use the semi-arbitrary lines assumed from an arc or end points of an arc, but my intu…

Set Rotate Axis to line

Rhino

brian (Brian Gillespie) November 19, 2025, 6:20pm 5

RH-90365 is fixed in Rhino WIP

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Set Rotate Axis to line

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