In OpenNurbs c# : convert 3d curves to Trim Curve possible?

Rhino Developer
1

Hi @dale,

Is that possible to convert an 3D Curve to trim curve in OpenNurbs c#.

I am trying to construct an Brep, (cylindrical surface with hole in it), but can’t able to create a trim curve. is that any possibilities or options available in OpenNurbs c#.

2

You will have to create the trim curve from code, there is no way in opennurbs to get a 2d trim curve for a 3d curve representing the hole. Such functionality is only available in the Rhino SDK, not in opennurbs.

3

through code in the sense,
using the intervals from the surface, and making the 3d edge curve to pullback to the surface parameter ?

if so can you suggest any working algorithm or samples ?

4

The example rhino-developer-samples/rhinocommon/cs/SampleCsCommands/SampleCsFaceWithHole.cs at 8 · mcneel/rhino-developer-samples · GitHub

Check the function CreateInnerTrimmingCurve at around line 400.

5

Yes!

image
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but those are hardcoded edges with static 4 sides for planar surface. what would be a generic logic for an cylindrical surfaces innerloop trims.

6

Even closedSide is not available in OpenNurbs
image
.