# NullPoint

VTKExamples/CSharp/PolyData/NullPoint

### Description

Set value of all associated arrays to zero all at once

A tutorial on how to setup a Console Application utilizing Kitware.VTK.dll can be found here: Setup a Console Application to use Kitware.VTK.dll

### Code

NullPoint.cs

    using System;
    using Kitware.VTK;

    namespace ActiViz.Examples {
       class Program {
          static void Main(string[] args) {
             NullPoint();
             Console.WriteLine("\nPress any key to continue...");
             Console.ReadKey();
          }

          private static void NullPoint() {
             vtkPoints points = vtkPoints.New();
             points.InsertNextPoint(1, 1, 1);
             points.InsertNextPoint(2, 2, 2);
             points.InsertNextPoint(3, 3, 3);

             vtkPolyData polydata = vtkPolyData.New();
             polydata.SetPoints(points);

             vtkFloatArray floatArray = vtkFloatArray.New();
             floatArray.SetNumberOfValues(3);
             floatArray.SetNumberOfComponents(1);
             floatArray.SetName("FloatArray");
             for(int i = 0; i < 3; i++) {
                floatArray.SetValue(i, 2);
             }
             polydata.GetPointData().AddArray(floatArray);

             vtkIntArray intArray = vtkIntArray.New();
             intArray.SetNumberOfValues(3);
             intArray.SetNumberOfComponents(1);
             intArray.SetName("IntArray");
             for(int i = 0; i < 3; i++) {
                intArray.SetValue(i, 2);
             }

             polydata.GetPointData().AddArray(intArray);

             Console.WriteLine("PointIdx   x y z " + "floatArray" + " " + "intArray");
             Console.WriteLine("----------------------------------------");
             for(int i = 0; i < 3; i++) {
                double[] p = polydata.GetPoint(i);
                vtkFloatArray pointsFloatArray = vtkFloatArray.SafeDownCast(polydata.GetPointData().GetArray("FloatArray"));
                vtkIntArray pointsIntArray = vtkIntArray.SafeDownCast(polydata.GetPointData().GetArray("IntArray"));
                Console.WriteLine("   " + i + "       " + p[0] + " " + p[1] + " " + p[2] + "    "
                          + pointsFloatArray.GetValue(i) + "          " + pointsIntArray.GetValue(i));
             }

             polydata.GetPointData().NullPoint(1);
             polydata.Modified();
             Console.WriteLine("");

             for(int i = 0; i < 3; i++) {
                double[] p = polydata.GetPoint(i);
                vtkFloatArray pointsFloatArray = vtkFloatArray.SafeDownCast(polydata.GetPointData().GetArray("FloatArray"));
                vtkIntArray pointsIntArray = vtkIntArray.SafeDownCast(polydata.GetPointData().GetArray("IntArray"));
                Console.WriteLine("   " + i + "       " + p[0] + " " + p[1] + " " + p[2] + "    "
                          + pointsFloatArray.GetValue(i) + "          " + pointsIntArray.GetValue(i));

             }
          }
       }
    }