ProjectToCplane refuses to project the curve in the attached to WorldXY. This is because it would produce a “bad object” - I assume one of the small segments is sufficiently vertical to produce a zero or near-zero length segment. But, SetPt to Z0 does work - I get a “bad object” warning, but it pr…

Exploding the polyline, using ProjectToCPlane on the individual lines (70 lines do not project), and using Join on the projected lines results in a closed polyline. That should be simple process to automate for polylines.

[image] davidcockey: That should be simple process to automate for polylines. Yep, that’s why I think the functionality it should be included in the Rhino command.

ProjectToCPlane works on degree 3 curves with vertical segments, and even on vertical lines which are degree 3 curves. For the straight line case the resulting object can’t be seen (it does not show as a point) but can be found. (Added) The projected straight line has zero length but is not identifi…

Hi Mitch - added to the heap. Looks like you can, for now, shortcut your process with testCleanPolyline on the SetPt output, or, as you’re probably doing, Polyline.DeleteShortSegments(). https://mcneel.myjetbrains.com/youtrack/issue/RH-45780 -Pascal

[image] pascal: testCleanPolyline That’s a new one… Thanks. :smile:

@pascal ProjectToCPlane for NURBS curves with vertical segments results in a curve with stacked control points. The result is a valid object, not a bad object. Is there a command to either convert a curve with stacked control points to an identical multiknot curve, or to explode a curve with stack…

Hi David - thanks for the examples - I do not know of any tools that will fix the collapsed points NURBS case. testValidateControlPointSpacing will show you where there could be problems and where to split up the curve and SimplifyCrv, but nothing all bundled up that I know of. -Pascal

ProjectToCPlane refusal

Rhino Rhino for Windows

brian (Brian Gillespie) June 30, 2020, 10:31pm 9

RH-45780 is fixed in the latest WIP

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ProjectToCPlane refusal

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