No Intersection between these 2 surfaces

Rhino
1

Getting weird/no results with these 2 surfaces. For some reason Rhino doesn’t find any intersections between them. Looks like a bug to me.

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220422 IntersectionProblem.3dm (334.7 KB)

2

The Rhino model shows this:

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3

Oops, uploaded the file from my other topic.

Edit: Now the file should be the correct one

4

Running rebuildedges on those surfaces fixes the problem

5

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How did you create the surface with the two slits in it?

At the gumball location I selected 4 surface points which seem to be coincident.

Actually there are two “isocurves” with 4 coincident surface points.

6

@martinsiegrist To be honest, I don’t know how this surface was created. It’s a file I received from a client that’s causing issues with the plug-in I’m making for them. Trying to debug it I saw I cannot trim them and then realised I also cannot find an intersection between them.
RebuildEdges is something I’ve never had to use, and also didn’t know it existed. I’m a bit confused by why it’s needed as well.

7

The surface is planar and has way too many isocurves for a planar surface.

_Dupborder and looking at the control points of the curve also shows way too many control points.

I think you should duplicate the border and run _FitCrv to create a clean border with Degree=2.

Then _PlanarSrf

The result is a clean, planar surface.

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image2072×780 10.5 KB

220422 IntersectionProblem.3dm (335.3 KB)

PS: _RebuildEdges might get you an intersection but the surface is still bad.