Hey guys,

I've got a weird binding behavior in my application.

It's hard to explain so i will try my best by using some pics :-)

I've got an MVVM-based application which contains a shellview (Window) and a subviews (UserControl)

On startup the shellviewmodel creates 2 instances of the subview which were kept in a collection and this one is bound to the Itemsource property of a combobox.

by switching the selection of the combobox the current view of the shellview is changed.


The subview contains the Viewport and a 3D Model.

<HelixViewport3D Grid.Row="1" ZoomExtentsWhenLoaded="True" 
                                   ShowCoordinateSystem="{Binding ElementName=cbxShowDimensions, Path=IsChecked}">
            <SunLight/>
            <ns:Component3D 
                                   Length="2400" 
                                   Width="1800" 
                                   Thickness="25" 
                                   ShowMeasurements="{Binding ElementName=cbxShowDimensions, Path=IsChecked}"/>
            <SunLight/>
</HelixViewport3D>

As you can see the ShowCoordinateSystem-Property of the Viewport and the ShowMeasurements-Property of the 3D-Model are bound to a checkbox

Now the problem:

View one is updating properly




View 2 does not only the coordinate system does.

Missing dimensions :-(

Why do i have to have physical paths for all my obj and mtl files? i really dont want to deploy dozens of these model files to customers without first emedding them in a library. it appears the code supports physical paths only. After reviewing the code it would appear to be very simple to simply support streams and pulling from assembly resources. has anyone done this already before I add this myself?

agree, it should be possible to provide a mechanism that loads the attached files from streams!
https://helixtoolkit.codeplex.com/workitem/10026

Hi, I'm trying to load a 3ds model that I exported out of Blender and everything goes fine but the texture looks wrong. Each face should have its own colour.

This is the code I use to load the model and assign the texture:

 _currentModel = ModelImporter.Load("../../Models/planetCube.3ds");
 Model3DGroup modelGroup = (Model3DGroup)_currentModel;

GeometryModel3D model = (GeometryModel3D)modelGroup.Children[0];

var texture = new ImageBrush();
texture.ImageSource = new BitmapImage(new Uri(@"../../Textures/uvTest2.png", UriKind.Relative));
            model.Material = new DiffuseMaterial(texture);

Here are the files:
http://dl.dropbox.com/u/43365724/planetCube.3ds
http://dl.dropbox.com/u/43365724/uvTest2.png

Solved it thanks to this article on stackoverflow: Why does TextureCoordinates work as expected for a Viewport2DVisual3D, but not for a GeometryModel3D?

Just set ViewportUnits on the ImageBrush to Absolute! :)

I had a quick look at your model files - it seems like there is no texture defined in the .3ds file?
The StudioReader class already sets the ViewportUnits to Absolute, so I don't think any change is necessary in this library.

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>