I check a face in my brepbody and it is detected as cylinder, after I translate the cylindrical surface, it return face.IsCylinder as false why?

[image]Surface Discontinuity please provide more info. post your .3dm file and script so others can reproduce the error. same here…

RhinoDoc activeDoc = RhinoDoc.ActiveDoc; IEnumerable brepObjects = activeDoc.Objects.GetObjectList(ObjectType.Brep); RhinoObject object1 = brepObjects.ElementAt(0); bool hasBrepForm = object1.Geometry.HasBrepForm; if (hasBrepForm) { Brep brepBody = Brep.TryConvertBrep(object1.Geometry); brepBody.MakeDeformable(); BrepFace face1 = brepBody.Faces.ElementAt(2); ComponentIndex index = face1.ComponentIndex(); IEnumerable componentIndices = new List { index }; BrepEdge edge1 = Get_edge(brepBody, face1); Cylinder cylinder; Plane plane; face1.TryGetCylinder(out cylinder); bool Isplane = face1.TryGetPlane(out plane); Transform transform; if (face1.IsCylinder()) { Vector3d vector = cylinder.BasePlane.Normal; Plane plane1 = cylinder.BasePlane; double tolerance = 0; double timeLimit = 0.0; bool useMultipleThreads = false; double scalefactor = 2; Point3d point = cylinder.Center; transform = Transform.Scale(plane1, scalefactor, scalefactor, 1); //transform = Transform.Translation(20, 20, 1); brepBody.TransformComponent(componentIndices, transform, tolerance, timeLimit, useMultipleThreads); activeDoc.Views.Redraw(); object1.CommitChanges(); } else if (Isplane) { double tolerance = activeDoc.ModelAbsoluteTolerance; double timeLimit = 10.0; bool useMultipleThreads = true; //Transform transform = Transform.Translation(0, -10, 0); //brepBody.TransformComponent(componentIndices, transform, tolerance, timeLimit, useMultipleThreads); activeDoc.Views.Redraw(); object1.CommitChanges(); } //Pickup an outer surface } else { A = "its not a brep body"; } Here is the code to select a surface and if found cylindrical scale its diameter. When run first time though a script tag in grasshopper it increases the dia but when run again it dosent do the change thereafter if the same cylinderical surface is to be scaled.

Here is the file filetosee2.3dm (818.8 KB)

Hi @Rushank, [image] Rushank: it return face.IsCylinder as false why? This seems to work with your model: protected override Result RunCommand(RhinoDoc doc, RunMode mode) { var go = new GetObject { GeometryFilter = ObjectType.Surface, GeometryAttributeFilter = GeometryAttributeFilter.SubSurface }; go.SetCommandPrompt("Select cylindrical face"); go.Get(); if (go.CommandResult() != Result.Success) return go.CommandResult(); var brepFace = go.Object(0).Face(); if (null == brepFace) return Result.Failure; var tol = doc.ModelAbsoluteTolerance; var rc = brepFace.IsCylinder(tol); if (rc) { RhinoApp.WriteLine("IsCylinder = {0}", rc); rc = brepFace.TryGetFiniteCylinder(out var cylinder, tol); if (rc) { var brep = Brep.CreateFromCylinder(cylinder, false, false); if (null != brep) { var id = doc.Objects.AddBrep(brep); var rhObj = doc.Objects.Find(id); rhObj?.Select(true); } } } doc.Views.Redraw(); return Result.Success; } – Dale

Surface.IsCylinder

Rhino Developer

Tom_P June 6, 2023, 9:35am 2

same here…

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Surface.IsCylinder

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