How to display MeshElement3D as wireframe?

问题:

I would like to display any MeshElement3D (for example BoxVisual3d) in helix-toolkit as wireframe. How can this be accomplished?

EDIT:

Thanks to Erno de Weerd's answer I was able to write the following code

1. Class that extends BoxVisual3D

   public class GeometryBoxVisual3D : BoxVisual3D
   {
   
     public MeshGeometry3D Geometry()
     {
       return Tessellate();
     }
   }
   

2. Add the instance of box to the Viewport:

       GeometryBoxVisual3D box = new GeometryBoxVisual3D();
       box.Fill = new SolidColorBrush(Colors.Red);
       Viewport3D.Children.Add(box);
       MeshGeometry3D geometry3 = box.Geometry();
       LinesVisual3D lines = new LinesVisual3D();
       lines.Thickness = 3;
       lines.Points = geometry3.Positions;
       lines.Transform = new TranslateTransform3D(3,1,1);
       Viewport3D.Children.Add(lines);
   

This results in the following display:

If I hide the original box and place LinesVisual3D on top of the box, I can get the wirefrime displayed as if it was original object, but it is still missing the edges on the side.

回答1:

By calling MeshElement3D.Tesselate() you can get the MeshGeometry3D (mesh).

Next create a LinesVisual3D object.

Copy the Points of the mesh to the Points of the LinesVisual3D.

This will create the internal mesh (see the sources: LinesVisual3D.cs in helix toolkit)

Finally, make sure you set the thickness of the LinesVisual3D and add it to the scene.