Question

C＃3D wpf visual studio 2010

我有一个由我添加的数字三角形构成的圆圈组成的场景网眼背面和正面。

三角形出现在我的视野中，但它的内侧和外侧都是黑色的。我以这种方式添加材料

Material material = new DiffuseMaterial(new SolidColorBrush(Colors.Blue));

但如果我将材料更改为

Material material = new EmissiveMaterial(new SolidColorBrush(Colors.Red));

双方开始以这种颜色闪耀。

我有三个光源

< AmbientLight Color="White" / >

< DirectionalLight  x:Name="myDirectLight1" Color="White"/ >

< PointLight  x:Name="myPointLight1" Color="White" Position="0,0,0"/>

我也在哪里

myCamera.LookDirection = -(Vector3D)myCamera.Position; //always look to (0,0,0)
myDirectLight1.Direction = myCamera.LookDirection; //light comes from the camera

但是两侧仍然是黑色的（除非我将材料更改为EmissiveMaterial）???

灯光是否有某种默认范围未设置为无穷大？

圆圈很大，直径约为2000个单位，

此致

加

    private Model3DGroup CreateTriangleModel(Point3D p0, Point3D p1, Point3D p2, Material material, Material material2)
    {
        MeshGeometry3D mesh = null;
        GeometryModel3D model = null;
        Model3DGroup group = new Model3DGroup();

        //
        // Front side of jagged part
        //
        mesh = new MeshGeometry3D();

        mesh.Positions.Add(p0);
        mesh.Positions.Add(p1);
        mesh.Positions.Add(p2);

        mesh.TriangleIndices.Add(0);
        mesh.TriangleIndices.Add(1);
        mesh.TriangleIndices.Add(2);

        Vector3D normal = CalculateNormal(p0, p1, p2);

        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);
        //
        // Front side of the surface below the jagged edge
        //
        Point3D p3 = new Point3D(p1.X, p1.Y, bh);
        Point3D p4 = new Point3D(p2.X, p2.Y, bh);

        mesh.Positions.Add(p3);
        mesh.Positions.Add(p4);

        mesh.TriangleIndices.Add(1);
        mesh.TriangleIndices.Add(3);
        mesh.TriangleIndices.Add(4);

        normal = CalculateNormal(p1, p3, p4);
        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);

        mesh.TriangleIndices.Add(1);
        mesh.TriangleIndices.Add(4);
        mesh.TriangleIndices.Add(2);

        normal = CalculateNormal(p1, p4, p2);
        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);

        model = new GeometryModel3D(mesh, material);

        group.Children.Add(model);


        //
        // Back side of jagged part
        //
        mesh = new MeshGeometry3D();

        mesh.Positions.Add(p0);
        mesh.Positions.Add(p1);
        mesh.Positions.Add(p2);

        mesh.TriangleIndices.Add(0);
        mesh.TriangleIndices.Add(2);
        mesh.TriangleIndices.Add(1);

        normal = CalculateNormal(p0, p1, p2);

        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);
        //
        // Back side of the surface below the jagged edge
        //
        p3 = new Point3D(p1.X, p1.Y, bh);
        p4 = new Point3D(p2.X, p2.Y, bh);

        mesh.Positions.Add(p3);
        mesh.Positions.Add(p4);

        mesh.TriangleIndices.Add(1);
        mesh.TriangleIndices.Add(4);
        mesh.TriangleIndices.Add(3);

        normal = CalculateNormal(p1, p4, p3);
        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);

        mesh.TriangleIndices.Add(1);
        mesh.TriangleIndices.Add(2);
        mesh.TriangleIndices.Add(4);

        normal = CalculateNormal(p1, p2, p4);
        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);
        mesh.Normals.Add(normal);

        model = new GeometryModel3D(mesh, material2);
        group.Children.Add(model);


        return group;
    }

    private Vector3D CalculateNormal(Point3D p0, Point3D p1, Point3D p2)
    {
        Vector3D v0 = new Vector3D(
            p1.X - p0.X, p1.Y - p0.Y, p1.Z - p0.Z);
        Vector3D v1 = new Vector3D(
            p2.X - p1.X, p2.Y - p1.Y, p2.Z - p1.Z);
        return Vector3D.CrossProduct(v0, v1);
    }

Answer 1

错误是我的光源是在XAML代码中定义的，但我很容易删除它们在源代码中导致奇怪的结果，其中对象是“可见的” 但无论材料如何，都是黑色的

C＃3D wpf黑色网格

1 个答案: