Hi,

I would like to know how I can load 3D Cloth Simulation file such as .obj from external software like Blender. Please reply with sample codes. Thanks a lot.

It should be possible to load standard .obj files, use the ObjReader class. The Read method will return a Model3D. I don't know of any 'cloth' properties in the .obj file format, can you provide a link?

Hi, I have same question but little different, how can I implement cloth simulation with cloth model exported from 3D software like blender. I saw the cloth examples with flag model, is it possible for helixtoolkit to create similiar cloth simulation with cloth model and combine it with kinect sensor? Thanks.

The VerletIntegrator may be reusable, but I will probably move this out of the library soon. I think you need a real 3D physics engine if you need to solve more advanced models. The cloth example was just a small test on WPF3D performance based on Thomas Jakobsens 'Advanced Character Physics' article.

The Kinect sensor is not supported in the toolkit (I don't want to add a reference to the Kinect SDK), but there is an example how to use Kinect with the toolkit!

I've touched on this before, but thought I would start a fresh thread.

I have an .OBJ model with 5 groups.
The five groups use a combination of materials.
One group may refer to more than one material.
The .OBJ file contains 33 references to these materials within the 5 groups.

When I load the OBJ file via Helix I end up with a model with 33 groups rather than the expected and desired 5 groups.

It seems the importer is making groups/children from each material rather than the OBJ file group.

Is this behaviour intended ?

It makes it impossible to run code on a single group, because its been split up.

When viewed in the model viewer the model appears as desired so there is no problem with mapping the textures.

P.S. The model loads fine in MeshLab

Just pulling the old topic in here : https://helixtoolkit.codeplex.com/discussions/528072

I changed my mind again. I think I was on track when I was suggesting the importer was making too many groups.

Because I can now answer this question :

objo wrote:

Can a group contain meshes with different materials?
In that case it is possible that the importer adds a new model for each mesh. The output model could be changed to a hierarchy, where the first level correspond to the groups.

The answer is yes a group can contain meshes with different materials :)

If that could be be changed to a hierarchy as you suggest then that may work for the best.

Was thinking... yeah I do that !

I was concerned that implementing the hierarchy might break a lot of people's code.

I overcame my problem with multiple groups by de-fragmenting my model before I import it into Helix.

I think I have to live with a mesh being broken into groups to suit the materials.

So really it's up to you if you want to change the way it works, though my vote would go for a hierarchy.

When trying to compile a few of the example projects, like the examplebrowser or the mvvmmanipulator, I get a build error regarding PepitaGet. What do I need to resolve it?

Error 1 The "PepitaGet.RestorePackagesTask" task could not be loaded from the assembly D:\Dropbox\Programming\CSharp\Examples\helixtoolkit_8c0d58aa0295\Source\Examples\ExampleBrowser..\Tools\Pepita\PepitaGet.dll. Could not load file or assembly 'file:///D:\Dropbox\Programming\CSharp\Examples\helixtoolkit_8c0d58aa0295\Source\Examples\Tools\Pepita\PepitaGet.dll' or one of its dependencies. The system cannot find the file specified. Confirm that the <UsingTask> declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask. D:\Dropbox\Programming\CSharp\Examples\helixtoolkit_8c0d58aa0295\Source\Examples\ExampleBrowser\ExampleBrowser.csproj 674 5 ExampleBrowser

Did you create a new solution file in a different directory? Then you need to correct the path to ~/Tools/Pepita/PepitaGet.dll in the .csproj files.
When the solution is in the ~/Source/ folder, the correct path is
<UsingTask TaskName="PepitaGet.RestorePackagesTask" AssemblyFile="$(SolutionDir)..\Tools\Pepita\PepitaGet.dll" />

What are the main changes in this latest version? I just have not found the change log.

See the change list descriptions - click "History" under the "Source code" tab. A new version is normally built at every code check-in.

Thank you!. My question was because I was interested in the new version if it had included the limits of the camera zoom. We'll have to keep waiting.

Experts,

I had awful luck with rotating my object and it keeping it's lat/lon straight, so I did the below-which I think is rotating my camera around the single object I have...

I want to let me users stop & start the rotation (menu, keypress, all in code-behind), but all I can do now is either in XAML... I might be doing this wrong, and as a result the right way is eluding me..

Thoughts?

<Grid.Triggers>

        <EventTrigger RoutedEvent="Canvas.Loaded">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation x:Name="camRotate360"  
                                     AutoReverse="False" 
                                     Duration="0:1:00" 
                                     From="360" 
                                     RepeatBehavior="Forever" 
                                     Storyboard.TargetName="camRotation" 
                                     Storyboard.TargetProperty="Angle" 
                                     To="0" />
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Grid.Triggers>

[...]

 <t:HelixViewport3D x:Name="view1" 
                       CameraRotationMode="Turnball"
                       ClipToBounds="False"
                       Grid.Column="0" 
                       IsChangeFieldOfViewEnabled="True"
                       IsHeadLightEnabled="True" 
                       IsHitTestVisible="True"
                       IsInertiaEnabled="True"
                       IsManipulationEnabled="True"
                       IsMoveEnabled="True"
                       IsPanEnabled="False"
                       IsRotationEnabled="True"
                       IsTouchZoomEnabled="True"
                       IsZoomEnabled="True"
                       LeftRightRotationSensitivity="5"
                       MouseDown="OnMouseDown" 
                       MouseMove="OnMouseMove" 
                       RotationSensitivity="5"
                       ShowCameraInfo="False"
                       ShowCameraTarget="False"
                       ShowCoordinateSystem="False"
                       ShowFieldOfView="False"
                       ShowFrameRate="True"
                       ShowTriangleCountInfo="True"
                       ShowViewCube="False"
                       SubTitle=""
                       SubTitleSize="0"
                       Title=""
                       TitleSize="0"
                       ZoomExtentsWhenLoaded="True" 
                       ZoomSensitivity="2"
                       ZoomAroundMouseDownPoint="True">
        <t:HelixViewport3D.Camera>
            <PerspectiveCamera Position="600,27400,0" 
                               LookDirection="0,1,0" 
                               UpDirection="0,0,1" 
                               NearPlaneDistance="0.01" 
                               FarPlaneDistance="Infinity" 
                               FieldOfView="40">

                <!-- I have to comment out the below to make the shape not rotate -->
                <!--<PerspectiveCamera.Transform>
                    <Transform3DGroup>
                        <RotateTransform3D>
                            <RotateTransform3D.Rotation>
                                <AxisAngleRotation3D Axis="0,0,1" Angle="0" x:Name="camRotation" />
                            </RotateTransform3D.Rotation>
                        </RotateTransform3D>
                    </Transform3DGroup>
                </PerspectiveCamera.Transform>-->

            </PerspectiveCamera>
        </t:HelixViewport3D.Camera>

peace on U

brothers, I want to create 3d modelling app with helix so can I do that with helix TK, or anyone know library for .net and compatible with Helix 3d TK for 3d modelling ?

I want anyone help me ,
Thanks,

No answers ,

OK I want make modelling WPF 3D APIs with support of helix TK

I can't see a question here. just go use helix and when you have troubles come back to ask

Hello,

This is probably a trivial problem, but I'm new to C# and WPF, and I've been scratching my head for some time now.
I'm using a CompositionTarget.Render, such that I can disable and re-enable some parts of the rendering (think I got this from the Points and Lines example).

Before I got all this to work, I used the Loaded += MainWindow_Loaded like in a lot of the examples. This included the ZoomExtents. A neat little feature.

I would like to know how I can incorporate this with the Compositiontarget.Render.

Some code below.

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
            CompositionTarget.Rendering += this.OnCompositionTargetRendering;            
       }
        void OnCompositionTargetRendering(object sender, EventArgs e)
        {

            if (ShowEdges && lines == null)
            {
                lines = new LinesVisual3D { Color = Colors.Red };
                view.Children.Add(lines);
            }
            if (!ShowEdges && lines != null)
            {
                lines.IsRendering = false;
                view.Children.Remove(lines);
                lines = null;
            }
            if (ShowFaceNormals && faceNormals == null)
            {
                faceNormals = new LinesVisual3D {Color = Colors.Purple};
                view.Children.Add(faceNormals);
            }
            if (!ShowFaceNormals && faceNormals != null)
            {
                faceNormals.IsRendering = false;
                view.Children.Remove(faceNormals);
                faceNormals = null;
            }
            if (ShowFaces && faces==null)
            {
                faces = new ModelVisual3D
                {
                    Content = new GeometryModel3D
                    {
                        Material = Materials.Red,
                        BackMaterial = Materials.Blue
                    }
                };

                view.Children.Add(faces);
            }
            if (!ShowFaces && faces != null)
            {
                view.Children.Remove(faces);
                faces = null;
            }

            if (lines != null)
            {
                createWireframe();
            }
            if (faceNormals != null)
            {
                createFaceNormals();
            }
            if (faces != null)
            {
                createFaces();
            }
        }

hi,
I added some models first and then added a PipeVisual3D , when I make the PipeVisual3D transparent by changing the Material and BackMaterial opacity, those models I added first appear just fine inside the pipe when I look from outside side, but if I added some models after I already add the PipeVisual3D, none of these appear , it looks transparent but it actually it is not , I would appreciate any clue

You must manually control the order of the Visual3D elements which you add to the scene, since WPF doesn't do transparency in the same way as OpenGL or even DirectX.

Add your Visual3Ds in order of decreasing opacity to get the right effects.

Rob

Thanks for your reply, Opacity is just for the PipeVisual3D, so the models are always with Opacity = 1, I don't have the choice here, the users want to be able to add some models/PipeVisual3D and delete them at any time, as I understood from your post , I have always to make sure that the models have to be as if they were added first, when I add a new model and change it's position on the tree,would that solve my problem ?
Thanks

Yes, it's just as you described. WPF renders the elements in list order. Just make sure the elements with less opacity are last in the list.

At times, I do this by specifying one list of Visual3Ds for the opaque stuff, and a second list for the non-opaque, stuff, and lay that out in the XAML. That pretty much guarantees the right behavior.

Rob

maybe you can use ElementSortingHelper.SortModel(Point3D position, IList<Visual3D> model);

Hi,
the fork for SharpDx is on version 2.4.0.
My need is to add DirectD2D1 library, but I only have it since 2.4.2. However, when I change Helix3D/SharpDx to either 2.4.2 or 2.5 (latter needs modifications in Helix.SharpDx), only a white page is rendered.
Q1: Is that normal? I am using Windows7.
Q2: Are there plans to update, or is that the reason why it is on old version?
Q3: Else, my problem is that I do not find the D2D1 lib for SharpDx 2.4.0 on the web, could somebody please help or advise.

Thanks a lot in advance,
Helix3D is a great help,
rüdiactivity

pm knows more about this fork than myself.
Q2: I think we should follow the latest stable version of SharpDx