Under review

HelixVisual3d not updating after created

10 years ago • updated by 3 years ago • 212

Hi,

I'm need to show a circular torus on the viewport. The closest option I found was the HelixVisual3D, but it has open ends. So I tried to create my own class to draw this, with a HelixVisual3D and two thin cones to close the ends. I used the classes from the Building Demo as reference, so I came up with this:

public class TorusVisual3D : UIElement3D
{
  public static readonly DependencyProperty AngleProperty = DependencyPropertyEx.Register("Angle", 90, (s, e) => s.AppearanceChanged());
  public static readonly DependencyProperty RadiusProperty = DependencyPropertyEx.Register("Radius", 0.35, (s, e) => s.AppearanceChanged());
  public static readonly DependencyProperty DiameterProperty = DependencyPropertyEx.Register("Diameter", 0.1, (s, e) => s.AppearanceChanged());

  private GeometryModel3D torus = new GeometryModel3D();
  private GeometryModel3D cap1 = new GeometryModel3D();
  private GeometryModel3D cap2 = new GeometryModel3D();

  public TorusVisual3D()
  {
  AppearanceChanged();

  Model3DGroup model = new Model3DGroup();

  model.Children.Add(this.torus);
  model.Children.Add(this.cap1);
  model.Children.Add(this.cap2);

  this.Visual3DModel = model;
  }

  public double Angle
  {
  get
  {
   return (double)this.GetValue(AngleProperty);
}
set
{
this.SetValue(AngleProperty, value);
}
  }

public double Radius
  {
  get
{
  return (double)this.GetValue(RadiusProperty);
  }
  set
  {
  this.SetValue(RadiusProperty, value);
  }
  }

  public double Diameter
  {
  get
{
  return (double)this.GetValue(DiameterProperty);
  }
  set
  {
  this.SetValue(DiameterProperty, value);
}
  }

  private void AppearanceChanged()
  {
  Material mat = MaterialHelper.CreateMaterial(Utils.GetRandomColor());

  HelixVisual3D h = new HelixVisual3D();
  h.Origin = new Point3D(0, 0, 0);
  h.Diameter = Diameter;
  h.Turns = Angle / 360.0;
  h.Radius = Radius;
  h.Length = 0;
  h.BackMaterial = mat;
  h.Material = mat;
h.UpdateModel();
  this.torus = h.Model;

  MeshBuilder cap1Builder = new MeshBuilder(false, false);
Point3D p1 = new Point3D(0, Radius, 0);
  cap1Builder.AddCone(p1, new Vector3D(0, 1, 0), h.Diameter / 2, h.Diameter / 2, 0.0001, true, true, 40);
  this.cap1.Material = MaterialHelper.CreateMaterial(Colors.Yellow);
  this.cap1.Geometry = cap1Builder.ToMesh();

  MeshBuilder cap2Builder = new MeshBuilder(false, false);
  Point3D p2 = new Point3D(-1, 0, 0);
  cap2Builder.AddCone(p2, new Vector3D(1, 0, 0), h.Diameter / 2, h.Diameter / 2, 0.0001, true, true, 40);
  this.cap2.Material = MaterialHelper.CreateMaterial(Colors.Red);
  this.cap2.Geometry = cap2Builder.ToMesh();
  }
}

To draw it I'm using the following code:

  TorusVisual3D t = new TorusVisual3D();
  t.Angle = m_angle;
  t.Radius = m_radius1;
  t.Diameter = m_radius2 * 2.0;
  t.Transform = new TranslateTransform3D(0, 0, 0);
  ModelVisual3D model = new ModelVisual3D();
  model.Children.Add(t);
  var container = new ContainerUIElement3D();
  container.Children.Add(model);
  viewport.Children.Add(container);

The problem is that the Helix is drawn with the default values (Radius=0.35, Diameter=0.1 and Angle=90) and is never updated again. No matter what values I set on the Properties, it stays the same. The both cylinder are updated correctly, just the Helix isn't.

What am I'm doing wrong?

Thanks in advance,
Rodrigo

Vote