evnormal


          
using Rhino; using Rhino.Input.Custom; using Rhino.DocObjects; using Rhino.Commands; namespace examples_cs { public class NormalDirectionOfBrepFaceCommand : Command { public override string EnglishName { get { return "csDetermineNormalDirectionOfBrepFace"; } } protected override Result RunCommand(RhinoDoc doc, RunMode mode) { // select a surface var gs = new GetObject(); gs.SetCommandPrompt("select surface"); gs.GeometryFilter = ObjectType.Surface; gs.DisablePreSelect(); gs.SubObjectSelect = false; gs.Get(); if (gs.CommandResult() != Result.Success) return gs.CommandResult(); // get the selected face var face = gs.Object(0).Face(); if (face == null) return Result.Failure; // pick a point on the surface. Constain // picking to the face. var gp = new GetPoint(); gp.SetCommandPrompt("select point on surface"); gp.Constrain(face, false); gp.Get(); if (gp.CommandResult() != Result.Success) return gp.CommandResult(); // get the parameters of the point on the // surface that is clesest to gp.Point() double u, v; if (face.ClosestPoint(gp.Point(), out u, out v)) { var direction = face.NormalAt(u, v); if (face.OrientationIsReversed) direction.Reverse(); RhinoApp.WriteLine( string.Format( "Surface normal at uv({0:f},{1:f}) = ({2:f},{3:f},{4:f})", u, v, direction.X, direction.Y, direction.Z)); } return Result.Success; } } }
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