Modify Surface using Control Points

[Tom_P]

grips

you might be able to access the Breps Grips and modify them.
check out this topic:

Is this a sensible way to get brep solid point grips and move them?

brepobj.GripsOn = True grips = brepobj.GetGrips() grip = grips[n] grip.CurrentLocation = Rhino.Geometry.Point3d(x, y, z) sc.doc.Objects.GripUpdate(brepobj, True)

setPoint returns true…

as fare as i can see you duplicated a face to a surface “sur”.
Then modify it - the relation to the initial Brep is lost.

Rhino.RhinoDoc.ActiveDoc.Objects.AddSurface(sur);

if you really want to dig into the Brep:
search “build brep from scratch”

Building Breps

Dear community, I am trying to build up geometries in Rhino. That means I try to create full patches with trimming information. I coded the following script, in the end all data seems to be correct but the Brep is still unvalid. When I check every entry it is valid. But in the end I am not able to create an entire patch with trimming information Is there somebody who could maybe help me? Thanks! I took the whole code with also the hashtables where I get the data from. var thisBrep = …

@dale

Here are a couple of examples of building Breps from scratch:

https://github.com/mcneel/rhino-developer-samples/blob/6/rhinocommon/cs/SampleCsCommands/SampleCsFaceWithHole.cs
https://github.com/mcneel/rhino-developer-samples/blob/6/rhinocommon/cs/SampleCsCommands/SampleCsTrimmedPlane.cs

Also, if you get your Brep “almost” build, try calling Brep.Repair and see if Rhino is smart enough to fill in the rest of the missing information.

– Dale

and check this for background - another example there…

Brep Data Structure

kind regards -tom