veerammalkumaran wrote at 2014-08-01 08:53:

         <h:HelixViewport3D Name="viewPort3D" >
            <h:SunLight />
            <ModelVisual3D x:Name="vis3D">
            </ModelVisual3D>
         </h:HelixViewport3D>

            var mb = new MeshBuilder(false, true);

            IList<Point3D> pnts = new List<Point3D>();
            pnts.Add(new Point3D(0, 0, 0));
            pnts.Add(new Point3D(100, 0, 0));
            pnts.Add(new Point3D(100, 100, 0));
            pnts.Add(new Point3D(0, 100, 0));

            mb.AddPolygon(pnts);

            var mesh = mb.ToMesh(true);

            ImageBrush brush = new ImageBrush();
            brush.ImageSource = new BitmapImage(new Uri(@"C:\box.jpg"));
            brush.TileMode = TileMode.Tile;
            brush.ViewportUnits = BrushMappingMode.Absolute;
            brush.ViewboxUnits = BrushMappingMode.Absolute;
            brush.Stretch = Stretch.None;
            brush.AlignmentX = AlignmentX.Left;
            brush.AlignmentY = AlignmentY.Top;
            brush.Viewport = new Rect(0, 0, brush.ImageSource.Width, brush.ImageSource.Height);
            DiffuseMaterial mat = new DiffuseMaterial(brush);

            GeometryModel3D gModel3D = new GeometryModel3D { Geometry = mesh, Material = mat };

            vis3D.Content = gModel3D;

veerammalkumaran wrote at 2014-08-01 10:12:

veerammalkumaran wrote at 2014-08-14 06:53:

govert wrote at 2012-02-03 13:57:

HalfEdge-based representations of unstructured polygonal meshes are common in contemporary mesh processing libraries like OpenMesh, VCG and CGAL. A previous discussion here mentioned the HalfEdge representations briefly, and I wanted to add some links I've run into recently and start a discussion on the topic, as some integration of such representations and related algorithms into the Helix Toolkit would be great (though not an urgent priority for me).

The typical HalfEdge implementations are template heavy C++ code, using traits to embed additional data into the structures. This makes the conversion of such data types to .NET quite tricky, though keeping some compatibility with the C++ data structures can be useful to ease porting of the processing algorithms to .NET.

Having a look around a bit, I found this article by Alexander Kolliopoupos which discusses the implementation issues and suggests an elegant implementation in C#: http://www.dgp.toronto.edu/~alexk/halfedge.pdf. He also has an open source (liberal zlib/libpng license) library that implements these data structures here: http://www.dgp.toronto.edu/~alexk/lydos.html. It doesn't look like it is actively maintained, but might be a good start for integrating such a mesh representation into the Helix Toolkit.

If other users have some experience working with HalfEdge or related mesh representations in .NET, I'd be interested in any pointers. I'm particularly interested in pragmatic algorithms for model repair, smoothing and simplification. I also wonder what people think about implementing these in C# vs. wrapping one of the C++- based libraries in a .NET wrapper. (The GPL licensing of the existing libraries is a bit of a problem for me.)

Any thoughts appreciated...

objo wrote at 2012-02-03 14:09:

This looks very interesting! Will have a look at Kolliopoulos' article and code.

objo wrote at 2012-02-21 21:29:

I tried to make a naive halfedge class using LINQ, but don't have time to finish it right now. I checked it into the examples anyway. See HalfEdgeMeshDemo. I hope to continue this class later, it's an interesting algorithm to explore :)

At this point I did not include any generic traits (as the referenced libraries do) and did not focus on performance, I just wanted to see if I could get the data structure right. I also added a Visual3D class that lets you point and click to see adjacent vertices/edges/faces.

charismatubagus wrote at 2013-01-23 15:31:

Hi,

I have successfully displayed a 3ds file in my WPF scene. But, the material color is just black and no texture is applied on it. 

<h:FileModelVisual3D x:Name="model3D" >
                <h:FileModelVisual3D.Transform>
                    <Transform3DGroup>
                        <ScaleTransform3D ScaleY="5.0" ScaleX="3.0" ScaleZ="2.0"/>
                        <TranslateTransform3D OffsetX="0" OffsetY="3" OffsetZ="0"/>
                        
                    </Transform3DGroup>
                </h:FileModelVisual3D.Transform>
</h:FileModelVisual3D>

objo wrote at 2013-01-23 20:21:

is the texture in .tga format? .tga is not supported. Change the images to .png, and the importer will replace .tga with .png in the file names when loading the textures...

charismatubagus wrote at 2013-01-25 07:53:

The texture format is jpg. So you're saying I just need to convert the image format into png?

objo wrote at 2013-02-04 15:15:

zoras wrote at 2013-06-02 21:29:

FileModelVisual3D MyModel = new FileModelVisual3D();
MyModel.Source = MODELS[i];   //where MODELS[i] is a string containing the path of a model (i.e. .../.../ship.3ds)
this.view1.Children.Add(MyModel);   //where view1 is my HelixViewPort3D

objo wrote at 2013-06-08 07:24:

lizichao wrote at 2011-07-09 10:44:

How to use meshbuilder in SurfacePlotDemo? I guess there should be a subclass of ParametricSurface3D. But I didnt find it.

Thanks.

Best regards!

objo wrote at 2011-07-11 11:58:

hi Lizichao,
I combined both the surface and the axes into the SurfacePlotVisual3D class in the demo. You can define the surface simply by setting the Points property.
This demo is currently not working with other Visual3Ds, but the plan is to move the axis visuals over to the HelixToolkit to make it easier to reuse!

rinaldin wrote at 2013-09-25 17:09:

Imports System
Imports System.Collections.Generic
Imports System.Windows
Imports System.Windows.Media
Imports System.Windows.Media.Media3D
Imports HelixToolkit.Wpf

Class MainWindow
    Dim visualChild As New ModelVisual3D
    Dim plotmodel As New Model3DGroup

    Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded

        Dim label1 As GeometryModel3D = TextCreator.CreateTextLabelModel3D("test", Brushes.White, True, 32,
                                                           New Point3D(0, 0, 0),
                                                           New Vector3D(1, 0, 0), New Vector3D(0, 1, 0))
        plotmodel.Children.Add(label1)
        visualChild.Content = plotmodel
        HelixViewport3D1.Children.Add(visualChild)

    End Sub

End Class

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Prova" Height="378" Width="605" xmlns:h="http://helixtoolkit.codeplex.com" WindowStartupLocation="CenterScreen">
    <Grid>
        <h:HelixViewport3D HorizontalAlignment="Stretch" Name="HelixViewport3D1" VerticalAlignment="Stretch" Background="Black" Margin="0" TextBrush="White" CoordinateSystemLabelForeground="White" InfoForeground="White" />
    </Grid>
</Window>

rinaldin wrote at 2013-09-25 21:30:

Dim label1 As GeometryModel3D = TextCreator.CreateTextLabelModel3D("test", Brushes.White, True, 32,

objo wrote at 2013-09-25 23:16:

rinaldin wrote at 2013-09-26 10:46:

plotmodel.Children.Add(New AmbientLight(Colors.White))

Provagino wrote at 2011-10-06 21:16:

Can i import files in 3DXML?

objo wrote at 2011-10-06 22:29:

http://en.wikipedia.org/wiki/3DXML ?

No, 3DXML is not implemented.

DongMini wrote at 2012-08-02 02:07:

Hi, First, great toolkit, thank you! 

holes in the box, what should I do?

objo wrote at 2012-08-09 00:48:

The best solution would be to create a MeshGeometry where the holes are modelled. It should not be difficult to do the tessellation if the holes have regular shape.

I would not recommend using textures with transparency to show 'holes' with wpf 3d...

DongMini wrote at 2012-08-09 02:46:

var point3d_Out = new[] {new Point3D(0, 0, 0), new Point3D(6, 0, 0), new Point3D(4, 3, 0), new Point3D(6, 7, 0), new Point3D(0, 7, 0)};

var point3d_Hole = new[] {new Point3D(1, 2, 0), new Point3D(3, 2, 0), new Point3D(2, 4, 0), new Point3D(3, 5, 0), new Point3D(1, 5, 0)};

The hole was created by using CuttingEarsTriangulator.Triangulate to you Is there any plan to support.

objo wrote at 2012-08-09 08:48:

I don't think the ear clipping method supports holes (http://en.wikipedia.org/wiki/Polygon_triangulation).

I have not planned to implement other triangulation methods, but maybe you can use code from other .net libraries?

DongMini wrote at 2012-08-10 02:23:

Other ". NET libraries" could not be found

hard to sell in the hole  wpf3d

I can not speak English well.
So, more brutal.
google translator, I can not thank you enough  

^^;; Hahaha


Thank you so much for letting me answer

objo wrote at 2012-08-24 09:37:

http://stackoverflow.com/questions/2222601/net-polygon-triangulation-library

http://stackoverflow.com/questions/406301/polygon-triangulation-with-holes

http://paulbourke.net/papers/triangulate/morten.html

http://paulbourke.net/papers/triangulate/

http://www.cs.cmu.edu/~quake/triangle.html (looks good, try P/Invoke!)

chinh_nguyen wrote at 2013-01-07 13:15:

Hi all, I am newbie in term of 3D programming with WPF, so please bear with my beginner question: how to create a circle in 3D with known center point and it is on a plane which perpendicular to a line?

chinh_nguyen wrote at 2013-01-09 10:15:

Found the answer when asking in stackoverflow, post here in case anyone interested:

http://stackoverflow.com/questions/14195196/how-to-create-a-circle-in-3d-with-known-center-point-radius-and-it-is-on-a-plan

lightxx wrote at 2012-11-29 07:28:

Hi guys!

I just stared using helix and WOW is this toolkit powerful. Probably a bit too powerful for programmers inexperienced in 3D modeling like me.

Are there any good primers for the Helix 3D Toolkit? A getting started guide, some sort of walk through or whatever? I tried to find something on google but failed.

thanks!

objo wrote at 2012-11-30 18:10:

I recommend Charles Petzold's book "3D programming for Windows".

In this library, the examples are probably the best ways to learn how to use it. All classes should also be XML commented, giving you some info through intellisense.

lightxx wrote at 2012-12-01 16:23:

thank you very much!

eonxxx wrote at 2014-03-09 15:19:

 <MeshGeometry3D Normals="0,1,0 0,1,0 0,0.99620003,-0.087200001 0,0.99620003,-0.087200001 1,0,0 1,0,0 1,0,0 1,0,0 0,-1,0 0,-1,0 0,-0.99620003,0.087200001 0,-0.99620003,0.087200001 -1,0,0
-1,0,0 -1,0,0 -1,0,0 0,0.98479998,-0.1736 0,0.98479998,-0.1736 1,0,0>