Hi,

First of all I want to say big THANK YOU to all the contributors and authors of Helix. THIS IS OSOM!

Now to the point.
I need to control FOV, point of view and other parameters of the scene in the code but with the visual effects provided by manual control.
For example, if I change camera FOV in CameraSettings in the code, the FOV changes instantly but other properties of the camera remain unchanged. That's obviously how it's supposed to be.
But when you change camera FOV using mouse, the distance of the camera is adjusted (behind the scenes) so that apparent perspective changes, but ZOOM remains constant.
How can I achieve the same in the code??

I have same question/requirement for other parameters. For example, it's super easy to control the point of view of camera using mouse. How could I change the camera position with the same nice animation and effects in code instead?

Try the methods AddPanForce, AddRotateForce and AddZoomForce in the CameraController.
ChangeDirection and LookAt has animation time parameters, I agree there should also be a ChangeFov method! I added an issue: https://helixtoolkit.codeplex.com/workitem/10010

Thank you very much for the information.
I have to say, I'm deeply impressed with helixtoolkit. Really great work!!
I'm sorry for not replying earlier. Too many things on my head.

I'm importing a geometry from a file reading the vertices of the figures. For each type I've wrote the correct indices, for example:

        public GeometryModel3D Generate3D()
        {

               GeometryModel3D My3DModel = new GeometryModel3D(); //Materials ommited

            List<Point3D> puntos = new List<Point3D>();
            List<int> indices = new List<int>();

                if (Elementos[i] is CTRIA3)
                {
                    Point3D p1 = Elementos[i].Grids[0].ToPoint();
                    Point3D p2 = Elementos[i].Grids[1].ToPoint();
                    Point3D p3 = Elementos[i].Grids[2].ToPoint();
                    puntos.Add(p1);
                    puntos.Add(p2);
                    puntos.Add(p3);

                    int n = puntos.Count;

                    indices.Add(n - 3);
                    indices.Add(n - 2);
                    indices.Add(n - 1);

                }

                if (Elementos[i] is CQUAD4)
                {
                    Point3D p1 = Elementos[i].Grids[0].ToPoint();
                    Point3D p2 = Elementos[i].Grids[1].ToPoint();
                    Point3D p3 = Elementos[i].Grids[2].ToPoint();
                    Point3D p4 = Elementos[i].Grids[3].ToPoint();
                    puntos.Add(p1);
                    puntos.Add(p2);
                    puntos.Add(p3);
                    puntos.Add(p4);

                    int n = puntos.Count;

                    indices.Add(n - 4);
                    indices.Add(n - 3);
                    indices.Add(n - 2);

                    indices.Add(n - 4);
                    indices.Add(n - 2);
                    indices.Add(n - 1);

                }
            //More geometric stuff

            Mesh3D mesh = new Mesh3D(puntos, indices);
            MeshBuilder mb = new MeshBuilder(false, false); //I've tried the default constructor too

            mb.AddCylinder(new Point3D(0, 0, 0), new Point3D(100, 100, 100), 5, 20);
            mb.Append(mesh.ToMeshGeometry3D()); //I've tried switching the order
            
            //My3DModel.Geometry = mesh.ToMeshGeometry3D();
            My3DModel.Geometry = mb.ToMesh();
            return My3DModel;
}

What I want is to use both, manually created figures and using MeshBuilder class (for tubes, cones etc). But if I use the append method to try than, even if I do not add any stuff with the MeshBuilder I get this exception:

An unhandled exception of type 'System.InvalidOperationException' occurred in HelixToolkit.Wpf.dll

Additional information: Wrong number of normal vectors.

What can I do to fix this situation? I know that there is a method called add triangles but It would be a bit difficult to implement for me right now.

This looks like a bug in Mesh3D or MeshBuilder. I don't think you need to use a Mesh3D here. Try to use a mb.Append(puntos, indices)

Hello,

Can you help me with an example of "Zoom/Rotate around the mouse down point"? I failed when trying to search from document.

Thanks,

found in example Camera :)

https://helixtoolkit.codeplex.com/SourceControl/latest#Source/Examples/ExampleBrowser/Examples/CameraControl/

Is there a way to perform 3D Boolean operations like GeometryCombineMode in WPF 2D Graphics?

Sorry, this library only contains functionality to cut MeshGeometry3D by planes. See the MeshGeometryHelper.Cut method. I am not planning to add more advanced 3D boolean operations here.

I need a ruler in my project for helixviewport like Photoshop Ruler in 2D(in zoom values change to cm and then to mm).
Could you tell me where i should start to get this approach?
Is there any built-in element in helix for this?

i mean by ruler is like this in 3d space with zoom and move (not rotate) , finding measures for an image or a plane.

Hi everyone !

I added a 3d viewport inside a scatterview item. So I had to manually add a manipulator to the cameracontroller in order to catch the manipulation events on the viewport, otherwise the scatterview catch it. I did it this way :

        private void HV3DTouchDown(object sender, TouchEventArgs e)
        {
            CameraController cameraController = Viewport3D.CameraController;
            try
            {
                Manipulation.AddManipulator(Viewport3D, e.TouchDevice.AsManipulator());
            }
            catch
            {
                Console.WriteLine("Error occured in Sketch3D.HV3DTouchDown");
            }
            e.Handled = true;
            CaptureTouch(e.TouchDevice);
        }

        private void HV3DTouchLeave(object sender, TouchEventArgs e)
        {
            CameraController cameraController = Viewport3D.CameraController;
            try
            {
                Manipulation.RemoveManipulator(cameraController, e.TouchDevice.AsManipulator());
            }
            catch
            {
                Console.WriteLine("Error occured in Sketch3D.HV3DTouchLeave");
            }
            e.Handled = true;
            CaptureTouch(e.TouchDevice);
        }

But now, I would like to catch the manipulation on a manipulator (or any other 3D object in my scene) and I can't figure out how to achieve it, because of the AddManipulator method which only takes a UIElement and not a UIElement3D...

Is there any workaround about this ?

Thanks in advance ! Regards.
(Sorry for my bad english...)

Hi there, nice library.

I've used MeshBuilder.AddTube to create a tube with open ends. If I wanted to create a tube with a specific wall thickness is there a method somewhere to create a shell from a such a surface?

I guess I'm looking for something like this

http://help.solidworks.com/2012/English/solidworks/sldworks/hidd_dve_feat_shell.htm

I think you can create another tube, and then reverse the triangle indices to flip the normals to the inside.
But it would desirable to improve the current MeshBuilder method to support inner diameters and end caps! Sorry, I can't help you with this at the moment.