Intersection Surface with Plane

Hi,
Does anyone have a suggestion to the rhino function to use when trying to intersect a given surface with a given plane? Basically I'm looking for the VB equivalent of the Sec (Brep|Plane) grasshopper function. I wish to do this via script because this tool will be recursive and will set up the next cut plane based on the last cut plane.

Thanks.

kermin

Replies to This Discussion

Permalink Reply by David Rutten on October 6, 2009 at 4:15pm

I use RhinoIntersectBreps in Grasshopper. You just have to make sure that your plane is converted into an OnPlaneSurface which truly intersects the entire base shape.

--
David Rutten
david@mcneel.com
Seattle, WA

Permalink Reply by kermin chok on October 6, 2009 at 4:41pm

Thanks. In order to create the onplanesurface, I'm trying to use the RhUtil.RhinoCreateSurfaceFromCorners function. Unfortunately, this completely crashes grasshopper even before I can get to the intersection part.

I plan to set up a unit plane and then use a separate function to reset it to the correct location etc.

Any ideas to why the code below might cause the crash?

Dim CornerPts(3) As On3dPoint

CornerPts(0) = New On3dPoint(0, 0, 0)
CornerPts(1) = New On3dPoint(1, 0, 0)
CornerPts(2) = New On3dPoint(1, 1, 0)
CornerPts(3) = New On3dPoint(0, 1, 0)

Dim CutPlane As New OnSurface = RhUtil.RhinoCreateSurfaceFromCorners(CornerPts(0), CornerPts(1), CornerPts(2), CornerPts(3))

print(cutplane.IsValid)

Permalink Reply by Vicente Soler on October 6, 2009 at 5:23pm

Change the last line to:

Dim CutPlane As New OnNurbsSurface(RhUtil.RhinoCreateSurfaceFromCorners(CornerPts(0), CornerPts(1), CornerPts(2), CornerPts(3)))

Permalink Reply by David Rutten on October 6, 2009 at 8:36pm

Have a look at the RhinoCutPlane, RhinoExtendLineThroughBox and especially the RhinoPlaneThroughBox functions in RhUtil.

They are all useful functions in this context.

--
David Rutten
david@mcneel.com
Seattle, WA

Permalink Reply by Arthur Mamou-Mani on June 17, 2011 at 9:02am

Thanks a lot for this thread!

What type hint should be associated with a plane and how can they be converted to OnPlaneSurface?

Permalink Reply by David Rutten on June 17, 2011 at 10:09am

Hi Arthur,

are you still coding in the old SDK?

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Arthur Mamou-Mani on June 17, 2011 at 11:10am

Hi David,

Really sorry I actually understood a bit late that this thread was using Rhutil...etc... and there is an "Intersection Surface with Plane" tool too in GH now so I got it all wrong. I was still curious which type hint would be selected if I plugged in a plane though?

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