Hi,

I am relatively new to the HelixToolkit and I have a (probably simple) question: I want to build a scene out of several .stl files and I aim to employ parent/children relations in order to apply transforms to the whole hierarchy "automatically".
I created the following class to represent a mechanical axis (imagine a robot arm with a few scene graph nodes), but when I build up the data structure, only the root is rendered. The strange thing is: The Visual3D objects cannot be added to the Viewport3D once they have been set as a child somewhere else (e.g. after I added the Visual3D children to the parents, this is expected behaviour afaik). But these children are not rendered (except the root). I do assume I am missing some event or notification I should trigger? I browsed through most of the examples, usually a Model3D is built on the fly if an aggragation of meshes is needed. I would be grateful for any hints in this matter.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Windows;
using System.Windows.Media.Media3D;
using PropertyTools.DataAnnotations;
using BrowsableAttribute = System.ComponentModel.BrowsableAttribute;

using HelixToolkit.Wpf;

namespace Vizualizer_WPF
{
    //class MachineAxis3D : UIElement3D
    class MachineAxis3D: ModelVisual3D
    {
        public static DependencyProperty RotationAngleProperty = DependencyPropertyEx.Register<double, MachineAxis3D>("RotationAngle", 0, (s, e) => s.AppearanceChanged());
        public static readonly DependencyProperty PrincipalDirectionProperty = DependencyPropertyEx.Register<Vector3D, MachineAxis3D>("PrincipalDirection", new Vector3D(1, 0, 0), (s, e) => s.AppearanceChanged());

        public MachineAxis3D()
        {

        }

        [Category("AxisProperties")]
        [Slidable(0, 360)]
        [Browsable(true)]
        public double RotationAngle
        {
            get
            {
                return (double)this.GetValue(RotationAngleProperty);
            }

            set
            {
                this.SetValue(RotationAngleProperty, value);
            }
        }

        public Vector3D PrincipalDirection
        {
            get
            {
                return (Vector3D)this.GetValue(PrincipalDirectionProperty);
            }

            set
            {
                this.SetValue(PrincipalDirectionProperty, value);
            }
        }

        public int ChildrenCount()
        {
            return this.Visual3DChildrenCount;
        }

        public void AddChild(Visual3D visual3D, Model3D model3D)
        {
            Model3DGroup newGroup = new Model3DGroup();
            newGroup.Children.Add(this.Content);
            newGroup.Children.Add(model3D);
            Content = newGroup;
            AddVisual3DChild(visual3D);
        }        

        // handles the rotation of the axis
        private void AppearanceChanged()
        {
            var tg = new Transform3DGroup();
            tg.Children.Add(new RotateTransform3D(new AxisAngleRotation3D(PrincipalDirection, RotationAngle)));
            Transform = tg;
        }
    }
}

Hi

Great work on the new version of HelixToolkit! Really impressed by the work done!

A small question: When I set the transparency of a billboard to Color.Transparent the billboard gets transparent (great). One small problem I have right now: other billboards that are behind this billboard gets cut. Is there any way of solving this problem?

Picture:

Best regards

Isdas

I have developed a WindowsFileExplorerShellExtension using HelixToolkit to show STL files in the Windows File explorer.

Everythings works fine with normal "human made" STL-files, but scanned 3D models converted to STL becomes large and I get OutOfMemory violation at modelimporter.

I have a simplified VS 2017 solution that contains a simple testapplication and a simple STL viewer that popsup when a file is coosen or Drag-n-Droped.

This is the method I have used to create the model

QUESTION?? Is there a better way to create a model from a STL file??

 public void ViewNewStl(string filename)
        {
            
            // WTF!! No file
            if (!File.Exists(filename)) return;

            // Check the file extension to be STL
            FileInfo fileInfo = new FileInfo(filename);
            if (fileInfo.Extension.ToLower() != ".stl") return;

            ModelColor = "Blue";HelixToolkitTestApplication.ziptestapplication

            Filename = filename;

            // Create a model of the STL file

            try
            {
                ModelImporter modellImporter = new ModelImporter();
                modellImporter.DefaultMaterial =
                    new DiffuseMaterial(
                        new SolidColorBrush((Color)ColorConverter.ConvertFromString(modellColor)));
                Model3DGroup model3DGroup = modellImporter.Load(filename);

                StlModel.Content = model3DGroup;

                myViewPort3D.CameraController.ResetCamera();
                myViewPort3D.CameraController.ZoomExtents(0);

            }
            catch (Exception e)
            {
                Debug.WriteLine($"modelimporter crash {e.Message}");
            }

        }

Hi all,

I have imported a car as *.stl file. I want to add some "devices" onto it for visualization.So When I perform a right click on the Car, at this position a Sphere should come up. I want to do a doubleclick on that sphere, and enter something like name, filepath for a text file and so on.

Also I want to ensure, that the user can not add multiple spheres over each other on the same position.

It tried to cath this situation with the following:

if (!CreatedDevices.Any(t => Math.Abs(t.Center.X) + 300 > mousePos.X))

So the mousePos is the position of my mouse and the CreatedDevices is a list of spheres with their properties like center and radius etc..

However, I am not able to doubleclick on a sphere and do something, and in addition to that the mouse position.x is sometimes -83 and the sphere position.x is 1200. I think it has something to do with the Coodinate system of my obj file and that my mouse is not in the same coordinate system. is this possible? I attached my whole project - I need some urgent help because I have no clue how to go on from here... thanks a lot!My project should be attached.

Hi!

Is it possible to use HelixToolkit in Xamarin projects on Visual Studio 2017?

I can import the DLLs from Nuget, but they are marked by a warning sign.

My Xamarin project targets .Net standard 2.0.

Thanks!

Does anybody see a possibility to create a silhouette or edge shader to highlight edges?

Could I write it by my own, or does helix toolkit already provide something like this?

I need to visualize the feed from Kinect in 3D. Is there an open source project using Helix Toolkit for this? The HelixToolkit.Kinect.sln project gives an error when building it saying that it's output is a class object even after changing it and assigning a startup object in project settings? 

It is possible to create a mesh editor with Helix Toolkit? I would like to be able to be able to modify vectors, edges and faces by dragging on a design surface.

When I try to zoom in (middle mouse wheel) using helix toolkit viewport it shudders, then refuses to zoom in. I can zoom out, but when I try to zoom back in it fails again. If I zoom out, go behind the model and then zoom in, it works sometimes, then I can go back around the front and zoom in.

Failed to paste example code.

In the helix Viewport overlay by default you have both the camera information and the coordinate system in the lower left corner.

I think you should move the camera information to the top left corner, and move the title to the top center, so that none of the overlays, overlap each other.