sprotznock wrote at 2013-12-02 09:49:

objo wrote at 2013-12-02 19:12:

sprotznock wrote at 2013-12-03 19:00:

Aurega wrote at 2013-11-29 14:51:

RobPerkins wrote at 2013-11-30 08:26:

objo wrote at 2013-12-02 19:59:

Tottel wrote at 2013-11-14 18:04:

Tottel wrote at 2013-11-19 20:18:

objo wrote at 2013-11-19 22:22:

Tottel wrote at 2013-11-20 00:11:

objo wrote at 2013-11-20 08:12:

Tottel wrote at 2013-11-23 14:31:

a5r wrote at 2013-11-24 10:48:

Tottel wrote at 2013-11-28 10:34:

lightxx wrote at 2012-12-19 08:49:

I'm designing a UI where i want to exclude a couple of Visual3Ds from hit - testing.

So I thought it would probably be a good idea to use two overlapping HelixViewport3Ds and set IsHitTestVisible to false on one of them to exclude those Visual3Ds from hit-testing.

Now, how do i sync the cameras of those two HelixViewport3Ds so when i pan/zoom/... the first one the second one stays in snyc?

Or is there a better approach to this problem?

lightxx wrote at 2012-12-19 09:14:

ok. the trick was to do two-way bindings. sorry.

<PerspectiveCamera LookDirection="{Binding ElementName=boardView, Path=Camera.LookDirection, Mode=TwoWay}"  Position="{Binding ElementName=boardView, Path=Camera.Position, Mode=TwoWay}" UpDirection="{Binding ElementName=boardView, Path=Camera.UpDirection, Mode=TwoWay}"/>

lightxx wrote at 2012-12-19 09:24:

the Viewports still have a slight offset ... weird.

objo wrote at 2012-12-19 09:27:

Did you try using UIElement3Ds

http://msdn.microsoft.com/en-us/library/system.windows.uielement3d.ishittestvisible.aspx

lightxx wrote at 2012-12-19 10:03:

thanks for pointing me in the right direction!!!

chriskro wrote at 2013-11-05 16:34:

objo wrote at 2013-11-11 12:43:

chriskro wrote at 2013-11-13 09:01:

objo wrote at 2013-11-19 23:03:

sarankani wrote at 2012-12-10 20:01:

Hi Objo,

I am new bee to helix 3D. I need to load many .3ds file in helix viewport. Now i am using the following code

var modelGroup = new Model3DGroup();
            var reader = new StudioReader();
            FileStream c = new FileStream(@"F:\\helixtoolkit3dfiles\" + URL, FileMode.Open, FileAccess.Read, FileShare.Read);           
            reader.TexturePath = ".";
            modelGroup = reader.Read(c);
           this.Model = modelGroup;
            c.Close();

I can only load one file at a time. I need to load many. Thanks in advance for your help. Please let me know your suggestions.

objo wrote at 2012-12-13 23:02:

try adding the loaded models to the Children collection

http://msdn.microsoft.com/en-us/library/system.windows.media.media3d.model3dgroup.children.aspx

MichaelKubrak wrote at 2012-09-27 15:14:

Hello. I need to show the distribution of heat in a solid object. The first thing I came up with that figure expanded to many cubes and noticed paint them depending on the situation. but it's no good for me, because shapes are complex and large.The second thought is that the load already created a model from a file, and then divide it by cutting. But after cutting a cavity appears in the model. Please tell me how to close the cavity?Cutting is done using MeshGeometryHelper.Cut function. Maybe you can get all the vertexes models after cutting, and put them together again to paint this area?

objo wrote at 2012-10-09 22:28:

There is a simple "Ear clipping" triangulation method (see Geometry/CuttingEarsTriangulator) that can be used to close simple convex polygon cutting regions. If your cuts are creating more complex regions you need a more advanced triangulation method (not included in this toolkit). http://en.wikipedia.org/wiki/Polygon_triangulation

murray_b wrote at 2012-03-27 05:28:

Hi objo

I am trying to print out to scale from the HelixViewport3D. 

I have an example from the book "3D Programming for Windows by Charles Petzold"

In it he utilises the Viewport3DVisual for printing to be able to control the printing better. ( do you have this book I can post the relevant sections if not). Of course HelixViewport extends Viewport3D so I don't have access to this and am not sure how to get it. 

Is this something you think I can use Helix for, and would this be a good approach. Or can you recommend a better way to print to scale.

thanks

Murray

objo wrote at 2012-04-05 01:47:

I have not tried this myself, but I understand you have to create a separate Viewport3DVisual to do this (I see Petzold put it inside a VisualBrush with stretch=None). Have you tried temporarily moving the camera and Visual3D contents from the HelixViewport3D to the Viewport3DVisual when you want to print?

murray_b wrote at 2012-08-31 12:29:

Hi Objo

I have done this and I was thinking it was working fine.

However I have recently found that I can't get text to be printed.

Once I narrow down the issue I will post more. I just wanted to check that you haven't made this work since we had this discussion.

thanks

Murray

murray_b wrote at 2012-09-07 02:28:

For anyone else who has this problem. 

We got it working. Basically had to pause the code before creating the image from thh Veiwport3DVisual

  visual3D.Dispatcher.BeginInvoke(new System.Action(() => { })).Wait();
  BitmapSource bitmapSource = RenderBitmap(visual3D, Width, Height, Brushes.White);

It now renders the text correctly

zaurska wrote at 2012-08-15 16:52:

Hi

Is there a good way to take Point data and generate a mesh?

I have 300,000 points and if I just iterate through taking consecutive triangles and ignoring "Big triangles" I get a sort of usuable point cloud in about 2 seconds but I want a surface.

I don't have a regular grid so some of the examples (Surface Plot and Kinect Demo) are nearly what I need but not quite.

I'm at the limit of my math and want to resist getting into delaunay/voronoi if its already a feature here.

H3D is so great!

Z

objo wrote at 2012-08-24 09:47:

Do you need a convex hull? See http://miconvexhull.codeplex.com/

zaurska wrote at 2012-08-28 15:51:

Wow!

Yes that looks like it.  Thanks so much.

So very cool!

jpg99 wrote at 2012-08-15 15:17:

hello,

i'm using your toolkit for a project at work . I  have to draw 3d houses from a 2D polygon (plane section of the house), so i experimented with AddExtrudedGeometry, and encountered several difficulties. Eventually i wrote my own function for building the 3d houses, and i don't remember precisely what the problems were (sorry it was a few weeks ago), mostly problems with triangles defined in the wrong sense so that the outside / inside were  inversed.

Here is the code i corrected in MeshBuilder.cs :

    public void AddExtrudedGeometry(IList points, Vector3D xaxis, Point3D p0, Point3D p1)
        {
            var ydirection = Vector3D.CrossProduct(xaxis, p0 - p1);
            ydirection.Normalize();
            xaxis.Normalize();

            int np = 2 * points.Count;
            foreach (var p in points)
            {
                int i0 = this.positions.Count;
                var v = (xaxis * p.X) + (ydirection * p.Y);
                this.positions.Add(p0 + v);
                this.positions.Add(p1 + v);
                v.Normalize();
                if (this.normals != null)
                {
                    this.normals.Add(v);
                    this.normals.Add(v);
                }

                if (this.textureCoordinates != null)
                {
                    this.textureCoordinates.Add(new Point(0, 0));
                    this.textureCoordinates.Add(new Point(1, 0));
                }
               
                int i1 = i0 + 1;
                int i2 = (i0 + 2) % np;
                int i3 = i2 + 1;

                this.triangleIndices.Add(i0);
                this.triangleIndices.Add(i2);
                this.triangleIndices.Add(i1);

                this.triangleIndices.Add(i2);
                this.triangleIndices.Add(i3);
                this.triangleIndices.Add(i1);
            }
        }

    
   public void AddTriangleFan(
            IList fanPositions, IList fanNormals = null, IList fanTextureCoordinates = null)
        {
            if (this.positions == null)
            {
                throw new ArgumentNullException("fanPositions");
            }

            if (fanNormals != null && this.normals == null)
            {
                throw new ArgumentNullException("fanNormals");
            }

            if (fanTextureCoordinates != null && this.textureCoordinates == null)
            {
                throw new ArgumentNullException("fanTextureCoordinates");
            }

            int index0 = this.positions.Count;
            foreach (var p in fanPositions)
            {
                this.positions.Add(p);
            }

            if (this.textureCoordinates != null && fanTextureCoordinates != null)
            {
                foreach (var tc in fanTextureCoordinates)
                {
                    this.textureCoordinates.Add(tc);
                }
            }

            if (this.normals != null && fanNormals != null)
            {
                foreach (var n in fanNormals)
                {
                    this.normals.Add(n);
                }
            }

            int indexEnd = this.positions.Count;
            for (int i = index0; i + 2 < indexEnd; i += 3)
            {
                this.triangleIndices.Add(i);
                this.triangleIndices.Add(i + 1);
                this.triangleIndices.Add(i + 2);
            }
        }

objo wrote at 2012-08-24 09:49:

Thanks for the code! I added http://helixtoolkit.codeplex.com/workitem/9964