﻿MeshVertexNormalList.ComputeNormals Method

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

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

#### Return Value

Type: Boolean
true on success, false on failure.
Examples
```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;
}
}```
```import Rhino
import scriptcontext
import System.Guid

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()
scriptcontext.doc.Views.Redraw()
return Rhino.Commands.Result.Success
return Rhino.Commands.Result.Failure

if __name__=="__main__":