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MeshVertexNormalListComputeNormals Method

Computes the vertex normals based on the physical shape of the mesh.

Namespace:  Rhino.Geometry.Collections
Assembly:  RhinoCommon (in RhinoCommon.dll)
Since: 5.0
Syntax
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public bool ComputeNormals()

Return Value

Type: Boolean
true on success, false on failure.
Examples
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using System;

partial class Examples
{
  public static Rhino.Commands.Result AddMesh(Rhino.RhinoDoc doc)
  {
    Rhino.Geometry.Mesh mesh = new Rhino.Geometry.Mesh();
    mesh.Vertices.Add(0.0, 0.0, 1.0); //0
    mesh.Vertices.Add(1.0, 0.0, 1.0); //1
    mesh.Vertices.Add(2.0, 0.0, 1.0); //2
    mesh.Vertices.Add(3.0, 0.0, 0.0); //3
    mesh.Vertices.Add(0.0, 1.0, 1.0); //4
    mesh.Vertices.Add(1.0, 1.0, 2.0); //5
    mesh.Vertices.Add(2.0, 1.0, 1.0); //6
    mesh.Vertices.Add(3.0, 1.0, 0.0); //7
    mesh.Vertices.Add(0.0, 2.0, 1.0); //8
    mesh.Vertices.Add(1.0, 2.0, 1.0); //9
    mesh.Vertices.Add(2.0, 2.0, 1.0); //10
    mesh.Vertices.Add(3.0, 2.0, 1.0); //11

    mesh.Faces.AddFace(0, 1, 5, 4);
    mesh.Faces.AddFace(1, 2, 6, 5);
    mesh.Faces.AddFace(2, 3, 7, 6);
    mesh.Faces.AddFace(4, 5, 9, 8);
    mesh.Faces.AddFace(5, 6, 10, 9);
    mesh.Faces.AddFace(6, 7, 11, 10);
    mesh.Normals.ComputeNormals();
    mesh.Compact();
    if (doc.Objects.AddMesh(mesh) != Guid.Empty)
    {
      doc.Views.Redraw();
      return Rhino.Commands.Result.Success;
    }
    return Rhino.Commands.Result.Failure;
  }
}
Python
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import Rhino
import scriptcontext
import System.Guid

def AddMesh():
    mesh = Rhino.Geometry.Mesh()
    mesh.Vertices.Add(0.0, 0.0, 1.0) #0
    mesh.Vertices.Add(1.0, 0.0, 1.0) #1
    mesh.Vertices.Add(2.0, 0.0, 1.0) #2
    mesh.Vertices.Add(3.0, 0.0, 0.0) #3
    mesh.Vertices.Add(0.0, 1.0, 1.0) #4
    mesh.Vertices.Add(1.0, 1.0, 2.0) #5
    mesh.Vertices.Add(2.0, 1.0, 1.0) #6
    mesh.Vertices.Add(3.0, 1.0, 0.0) #7
    mesh.Vertices.Add(0.0, 2.0, 1.0) #8
    mesh.Vertices.Add(1.0, 2.0, 1.0) #9
    mesh.Vertices.Add(2.0, 2.0, 1.0) #10
    mesh.Vertices.Add(3.0, 2.0, 1.0) #11

    mesh.Faces.AddFace(0, 1, 5, 4)
    mesh.Faces.AddFace(1, 2, 6, 5)
    mesh.Faces.AddFace(2, 3, 7, 6)
    mesh.Faces.AddFace(4, 5, 9, 8)
    mesh.Faces.AddFace(5, 6, 10, 9)
    mesh.Faces.AddFace(6, 7, 11, 10)
    mesh.Normals.ComputeNormals()
    mesh.Compact()
    if scriptcontext.doc.Objects.AddMesh(mesh)!=System.Guid.Empty:
        scriptcontext.doc.Views.Redraw()
        return Rhino.Commands.Result.Success
    return Rhino.Commands.Result.Failure


if __name__=="__main__":
    AddMesh()
See Also