pyrrhicpk1 wrote at 2012-10-16 11:37:

Hi,

I am able to draw a triangle using meshbuilder with Heli3DToolkit given three points in 3D space. My program updates these points and I want the triangle to get updated as well i.e. redrawn on the new points. How to do this?

At the moment I am re-creating the triangle using meshbuilder every time new set of points are available. This is working but computationally very expensive. It is also causing the UI to respond slowly. I was wondering if there could be a way to apply some transformation to the triangle geometry and re-position it to the new points rather than creating new triangle geometries.

Pleas guide me in this regard.

Thanks

objo wrote at 2012-10-16 15:37:

You should replace the positions only, it is not necessary to create new triangle indices and a new MeshGeometry3D instance.

See also http://msdn.microsoft.com/en-us/library/bb613553.aspx

pyrrhicpk1 wrote at 2012-10-17 04:17:

objo wrote:

You should replace the positions only, it is not necessary to create new triangle indices and a new MeshGeometry3D instance.

See also http://msdn.microsoft.com/en-us/library/bb613553.aspx

 

You mean, I should apply a TranslateTransform3D to my triangle geometry to reposition it to the new position. But, what would be this new position? My program is only updating the position of three spheres which I am using to create a triangle. So, when I get a new set of positions for these three spheres, how should I redraw/re-position my triangle geometry to these new positions? Could you please guide me with a few lines of sample code.

Thanks.

pyrrhicpk1 wrote at 2012-10-17 04:44:

I am creating a triangle as follows:

 meshBuilder.AddTriangle(new Point3D(x, y, z));

var mesh = meshBuilder.ToMesh(true);

myTrianglegeometry = new GeometryModel3D();
myTrianglegeometry.Material = greenMaterial;
myTrianglegeometry.BackMaterial = yellowMaterial;
myTrianglegeometry.Geometry = mesh;
modelGroup.Children.Add(myTrianglegeometry);

myModelVisual3D = new ModelVisual3D();
myModelVisual3D.Content = modelGroup;

Now my program is updating the values for x, y, and z. So, I am calling the above code for each update of x, y, z which creates a new triangle every-time a set of new x,y,z are available. This works but computationally very intensive and causes the UI response very slow.

To avoid this, how should I re-draw/re-position "myTrianglegeometry" to the new values of x,y,z rather than creating new triangles? Is it possible to change the vertices of the "myTrianglegeometry"?

Please guide me in this regard.

Thanks.

objo wrote at 2012-10-17 08:40:

if you are drawing a single triangle I think you should create the MeshGeometry3D directly, not using the MeshBuilder. 

See http://msdn.microsoft.com/en-us/library/bb613553.aspx

This section is important:

MeshGeometry3D

JohnyWhite wrote at 2013-07-17 23:51:

var importer = new ModelImporter();
CurrentModel = importer.Load(CurrentModelPath);

JohnyWhite wrote at 2013-07-18 01:00:

Mrme wrote at 2013-07-19 10:56:

rocheey wrote at 2012-07-23 20:56:

Great Toolkit. Im just getting started and Im already blown away.

I created a TruncatedConeVisual3D , as well as as a TranslateManipulator, in XAML, that is bound to the Cone Transform.

The Cone moves along the designated Axis correctly when dragging the TranslateManipulator

But after I move the Cone/manipulator in code using: (VB.Net)

OriginManipulator.Transform = New TranslateTransform3D(XShift, 0, 0)             Cone1.Transform = New TranslateTransform3D(XShift, 0, 0)

The Pair update, but I am unable to drag the mouse on the manipulator afterwards. The manipulator seems frozen in that spot, but dragging the mouse anyway moves the Cone (but the manipulator stays in place)

Am I going about this the right way ?

aueit wrote at 2014-08-12 16:01:

soheilvb wrote at 2012-04-14 00:35:

hi again .

in MaterialHelper.ChangeOpacity you forgot to add support for ImageBrush :

I just add this lines

var scbi = dm.Brush as ImageBrush;
                if (scbi != null)
                {
                    scbi.Opacity = d;
                }

after

            if (scb != null)
                {
                    scb.Opacity = d;
                }

and problem solved.

objo wrote at 2012-04-14 00:38:

Thanks for pointing this out! Actually, the code could be changed to

            var dm = material as DiffuseMaterial;
            if (dm != null && dm.Brush != null)
            {
                dm.Brush.Opacity = d;
            }

yetangye wrote at 2013-03-12 09:39:

objo wrote at 2013-04-15 13:03:

terry_513 wrote at 2014-02-12 13:14:

textureCoordinates.ForEach(meshBuilder.TextureCoordinates.Add)

            PipeVisual3D pipe1; // = DrawPipeOrg();
            pipe1 = new PipeVisual3D
                    {
                        Point1 = new Point3D(0, 0, (-10 - 0.1)),
                        Point2 = new Point3D(0, 0, (-15 + 0.1)),
                        Diameter = 2*7.86,
                        InnerDiameter = 2*1.5,
                       // Material =  HelixToolkit.Wpf.Materials.Green,
                       // BackMaterial = HelixToolkit.Wpf.Materials.Green
                    };
            model.Children.Add(pipe1); 
            c = new Plane3D { Position = new Point3D(0, 0, -10), Normal = new Vector3D(0, 0, -1) };
            cuttingGroup1.CuttingPlanes.Add(c);

rufus9876 wrote at 2011-09-23 17:18:

First of all I want to say thank you for the good work with this toolkit!
I found a strange behaviour setting the ZoomRectangleCursor. It will show no effect. The reason may be the missing

ZoomRectangleCursor="{TemplateBinding ZoomRectangleCursor}"

within the ControlTemplate in "Generic.xaml".

objo wrote at 2011-09-30 07:46:

thanks for the fix! I have checked it in, #70897.

BCBlanka wrote at 2013-03-19 10:12:

BCBlanka wrote at 2013-04-23 16:33:

murray_b wrote at 2012-06-18 03:05:

Hi Objo

I have come across some strange behavor that I don't understand the reason for.

I recently reversed on the of the axis so that it matched the underlying data I am using.

ModelUpDirection=new Vector3D(0,0,-1);

This then draws the data correctly, but I am getting a lot of flickering on my screen. My view is mostly meshed polygons. ( using GeometryModel3D).

There are flat polygons sitting on top of each other ( 0.1 apart). But now the view is not drawing this correctly. It flickers a lot and the polygon mesh from behind is shown in front in places its like it can't work out the z levels even though the two shapes do not touch.

If is rotate the view and look at it from the reverse direction it draws correctly and the flickering disappears.

Do you have any idea why this might be happening? 

Please let me know if my explanation is not detailed enough 

regards

Murray