vtkRenderWindow only works in Load Event

Support
1

I’m trying the ReadPLY example and it works. However, when I move the call to Readply() from renderWindowControl1_Load1 to a a button click event, it doesn’t work. Is there a way I can do this in the button click event?

2

The vtkRenderer is not available until the window control has loaded, so you need to disable your button until you can obtain a reference to it (in the load event). Then after adding the actor, in the click event renderWindowControl1.Invalidate()

3

@Todd - This is what I have, but it still doesn’t work. I wasn’t able to attach the ply file, but
you can find it here

`
public partial class Form1 : Form
{
private vtkRenderWindow renderWindow;
private vtkRenderer renderer;

    public Form1()
    {
        InitializeComponent();
    }

    private void renderWindowControl1_Load(object sender, EventArgs e)
    {
        try
        {
            button1.Enabled = false;
            renderWindow = renderWindowControl1.RenderWindow;
            renderer = renderWindow.GetRenderers().GetFirstRenderer();
            //ReadPLY();
            button1.Enabled = true;
        }
        catch (Exception)
        {
            throw;
        }
    }

    private void ReadPLY()
    {
        string filePath = @"C:\temp\airplane.ply";
        vtkPLYReader reader = vtkPLYReader.New();
        reader.SetFileName(filePath);
        reader.Update();

        vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
        mapper.SetInputConnection(reader.GetOutputPort());

        vtkActor actor = vtkActor.New();
        actor.SetMapper(mapper);
        renderer.AddActor(actor);
    }

    private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            ReadPLY();
            renderWindowControl1.Invalidate();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
}

`

4

I assume when you say “it doesn’t work” you mean it doesn’t display? Please be more specific.

in the button click event try
renderer.ResetCamera();
renderWindowControl1.Invalidate();

1 Like
5

Sorry, yes, it didn’t display anything. I added renderer.ResetCamera() and now it does display, so thank you!

1 Like