MeshGeometry3D.TriangleIndices Property

Gets or sets a collection of triangle indices for the MeshGeometry3D.

Namespace:  System.Windows.Media.Media3D
Assembly:  PresentationCore (in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public Int32Collection TriangleIndices { get; set; }
<object>
  <object.TriangleIndices>
    <Int32Collection .../>
  </object.TriangleIndices>
</object>
<object TriangleIndices="Int32Collection" .../>

Property Value

Type: System.Windows.Media.Int32Collection
Collection that contains the triangle indices of the MeshGeometry3D.

Identifier field

TriangleIndicesProperty

Metadata properties set to true

None

For a triangle in a given 3-D mesh, the order in which the triangle's vertex positions are specified determines whether the triangle face is a front or back face.

The Windows Presentation Foundation 3-D implementation uses a counter-clockwise winding order; that is, the points that determine a front-facing mesh triangle's positions should be specified in counterclockwise order, as viewed from the front of the mesh.

Setting the TriangleIndices property is optional. If the indices are not specified, triangles are drawn in a non-indexed fashion. Every set of three positions becomes a triangle.

<GeometryModel3D>
  <GeometryModel3D.Geometry>
          <MeshGeometry3D 
              Positions="-1 -1 0  1 -1 0  -1 1 0  1 1 0"
              Normals="0 0 1  0 0 1  0 0 1  0 0 1"
              TextureCoordinates="0 1  1 1  0 0  1 0   "
              TriangleIndices="0 1 2  1 3 2" />
      </GeometryModel3D.Geometry>
      <GeometryModel3D.Material>
          <DiffuseMaterial>
              <DiffuseMaterial.Brush>
                  <SolidColorBrush Color="Cyan" Opacity="0.3"/>
              </DiffuseMaterial.Brush>
          </DiffuseMaterial>
      </GeometryModel3D.Material>
  <!-- Translate the plane. -->
      <GeometryModel3D.Transform>
          <TranslateTransform3D
            OffsetX="2" OffsetY="0" OffsetZ="-1"   >
          </TranslateTransform3D>
      </GeometryModel3D.Transform>
  </GeometryModel3D>

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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