Adding ImageBrush to ModelVisual3D

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Hello guys!

With the following code I create my ModelVisual3D model.

C#

private ImageBrush texture = new ImageBrush(new BitmapImage(new Uri("Images//texture.png", UriKind.RelativeOrAbsolute))) { ViewboxUnits = BrushMappingMode.Absolute };

model = new ModelVisual3D();
Point3D pA = new Point3D(pos.X +  0.86602 * size, pos.Y, pos.Z +  0.50000 * size);
Point3D pB = new Point3D(pos.X +  0.86602 * size, pos.Y, pos.Z + -0.50000 * size);
Point3D pC = new Point3D(pos.X, pos.Y, pos.Z + size);
Point3D pD = new Point3D(pos.X + -0.86602 * size, pos.Y, pos.Z + -0.50000 * size);
Point3D pE = new Point3D(pos.X + -0.86602 * size, pos.Y, pos.Z +  0.50000 * size);
Point3D pF = new Point3D(pos.X, pos.Y, pos.Z - size);
Model3DGroup grp = new Model3DGroup();
grp.Children.Add(CreateTriangleModel(new DiffuseMaterial(texture), pB, pF, pD, new Point(0, 0), new Point(0, 100), new Point(100, 100)));
grp.Children.Add(CreateTriangleModel(new DiffuseMaterial(texture), pD, pE, pA, new Point(0, 0), new Point(0, 0.5), new Point(0.5, 0.5)));
grp.Children.Add(CreateTriangleModel(new DiffuseMaterial(texture), pB, pD, pA, new Point(0, 0), new Point(100, 0), new Point(100, 100)));
grp.Children.Add(CreateTriangleModel(new DiffuseMaterial(texture), pA, pE, pC, new Point(0, 0), new Point(0, 100), new Point(100, 100)));

I use this method to create my triangle models:

public static Model3DGroup CreateTriangleModel(Material material, Point3D p0, Point3D p1, Point3D p2, Point tc0, Point tc1, Point tc2)
{
    MeshGeometry3D mesh = new MeshGeometry3D();
    Vector3D normal = CalculateNormal(p0, p1, p2);
    mesh.Positions.Add(p0);
    mesh.Positions.Add(p1);
    mesh.Positions.Add(p2);
    mesh.TriangleIndices.Add(0);
    mesh.TriangleIndices.Add(1);
    mesh.TriangleIndices.Add(2);
    mesh.TextureCoordinates.Add(tc0);
    mesh.TextureCoordinates.Add(tc1);
    mesh.TextureCoordinates.Add(tc2);
    mesh.Normals.Add(normal);
    mesh.Normals.Add(normal);
    mesh.Normals.Add(normal);
    GeometryModel3D model = new GeometryModel3D(mesh, material);
    Model3DGroup group = new Model3DGroup();
    group.Children.Add(model);
    return group;
}

well the problem is, the image is not displayed correctly. it always shows the full image, no matter what points I use for TextureCoordinates. And I want to select a special triangle on my image for every triangleModel... thats why i use "ViewboxUnits = BrushMappingMode.Absolute"... but somehow this doesnt work. And if i set ViewboxUNits to AccordingToBoundingBox and use Points like (0, 0.5) it doesnt work either. It always shows the full image on my triangleModel and not only a part of it...

regards

Posted 20-Aug-12 13:21pm

abfl

Updated 20-Aug-12 14:11pm

v2

Add a Solution

2 solutions

Solution 1

I had asimular problem and solved it by this:
http://geekswithblogs.net/TimH/archive/2010/07/24/wpf-3d---programmatically-adding-an-image-brush.aspx[^]

Do this then:
http://blogs.msdn.com/b/danlehen/archive/2005/11/06/489627.aspx[^]

Posted 20-Aug-12 13:47pm

Kenneth Haugland

Updated 20-Aug-12 14:12pm

v2

Comments

abfl 20-Aug-12 20:06pm

well the problem is, the image is not displayed correctly. it always shows the full image, no matter what points I use for TextureCoordinates. And I want to select a special triangle on my image for every triangleModel... thats why i use "ViewboxUnits = BrushMappingMode.Absolute"... but somehow this doesnt work. And if i set ViewboxUNits to AccordingToBoundingBox and use Points like (0, 0.5) it doesnt work either. It always shows the full image on my triangleModel and not only a part of it...

Kenneth Haugland 20-Aug-12 20:09pm

tHen you should update your question, how should I have known this?

abfl 21-Aug-12 6:46am

Thx, but I've read this tutorial for about 10 times now and it doesn't help me.
When I use e.g. (0, 0), (0.5, 0.5), (0.5, 0) for the TextureCoordinates it shows me exactly the same Image like (0, 0), (1, 1), (1, 0) with this coordinates.
And if I set the ViewboxUnits to Absolute, coordinates like this (0, 0), (0, 100), (100, 100) show me the same Image like coordinates like this (0, 0), (0, 1), (1, 1)... I don't understand why it doesn't work like in the Tutorial...!?

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abfl · Accepted Answer · 2012-08-21T09:25:00

Ok, I managed to find a solution:

model = new ModelVisual3D();
Point3D pD = new Point3D(pos.X +  0.86602 * size, pos.Y, pos.Z +  0.50000 * size);
Point3D pE = new Point3D(pos.X +  0.86602 * size, pos.Y, pos.Z + -0.50000 * size);
Point3D pF = new Point3D(pos.X, pos.Y, pos.Z - size);
Point3D pA = new Point3D(pos.X + -0.86602 * size, pos.Y, pos.Z + -0.50000 * size);
Point3D pB = new Point3D(pos.X + -0.86602 * size, pos.Y, pos.Z +  0.50000 * size);
Point3D pC = new Point3D(pos.X, pos.Y, pos.Z + size);
MeshGeometry3D mesh = new MeshGeometry3D();
Vector3D normal = Model3DHelper.CalculateNormal(pA, pB, pC);
mesh.Positions.Add(pA);
mesh.Positions.Add(pB);
mesh.Positions.Add(pC);
mesh.Positions.Add(pD);
mesh.Positions.Add(pE);
mesh.Positions.Add(pF);
mesh.Normals.Add(normal);
mesh.Normals.Add(normal);
mesh.Normals.Add(normal);
mesh.Normals.Add(normal);
mesh.Normals.Add(normal);
mesh.Normals.Add(normal);
mesh.TextureCoordinates.Add(new Point(0.25, 1));
mesh.TextureCoordinates.Add(new Point(0.75, 1));
mesh.TextureCoordinates.Add(new Point(1, 0.5));
mesh.TextureCoordinates.Add(new Point(0.75, 0));
mesh.TextureCoordinates.Add(new Point(0.25, 0));
mesh.TextureCoordinates.Add(new Point(0, 0.5));
mesh.TriangleIndices.Add(0); mesh.TriangleIndices.Add(4); mesh.TriangleIndices.Add(5);
mesh.TriangleIndices.Add(0); mesh.TriangleIndices.Add(1); mesh.TriangleIndices.Add(3);
mesh.TriangleIndices.Add(3); mesh.TriangleIndices.Add(4); mesh.TriangleIndices.Add(0);
mesh.TriangleIndices.Add(1); mesh.TriangleIndices.Add(2); mesh.TriangleIndices.Add(3);