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DirectionalLight.Direction Property

Represents the vector along which the light's effect will be seen on models in a 3-D scene.

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
'Declaration
Public Property Direction As Vector3D
<object>
  <object.Direction>
    <Vector3D .../>
  </object.Direction>
</object>
<object Direction="Vector3D" .../>

Property Value

Type: System.Windows.Media.Media3D.Vector3D
Vector3D along which the light projects, and which must have a non-zero magnitude. The default value is (0,0,-1).

Identifier field

DirectionProperty

Metadata properties set to true

None

This example shows how to create a 3-D object that looks like a flat sheet of paper which has been rotated. A Viewport3D along with the following components are used to create this simple 3-D scene:

  • A camera is created using a PerspectiveCamera. The camera specifies what part of the 3-D scene is viewable.

  • A mesh is created to specify the shape of 3-D object (sheet of paper) using the Geometry property of GeometryModel3D.

  • A material is specified to be displayed on the surface of the object (linear gradient in this sample) using the Material property of GeometryModel3D.

  • A light is created to shine on the object using DirectionalLight.

The code below shows how to create a 3-D scene in XAML.

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
  <DockPanel>
    <Viewbox>
      <Canvas Width="321" Height="201">

        <!-- The Viewport3D provides a rendering surface for 3-D visual content. -->
        <Viewport3D ClipToBounds="True" Width="150" Height="150" Canvas.Left="0" Canvas.Top="10">

          <!-- Defines the camera used to view the 3D object. -->
          <Viewport3D.Camera>
            <PerspectiveCamera Position="0,0,2" LookDirection="0,0,-1" FieldOfView="60" />
          </Viewport3D.Camera>

          <!-- The ModelVisual3D children contain the 3D models -->
          <Viewport3D.Children>

            <!-- This ModelVisual3D defines the light cast in the scene. Without light, the 3D 
                 object cannot be seen. Also, the direction of the lights affect shadowing. If desired,
                 you can create multiple lights with different colors that shine from different directions. -->
            <ModelVisual3D>
              <ModelVisual3D.Content>
                <DirectionalLight Color="#FFFFFF" Direction="-0.612372,-0.5,-0.612372" />
              </ModelVisual3D.Content>
            </ModelVisual3D>
            <ModelVisual3D>
              <ModelVisual3D.Content>
                <GeometryModel3D>

                  <!-- The geometry specifes the shape of the 3D plane. In this sample, a flat sheet is created. -->
                  <GeometryModel3D.Geometry>
                    <MeshGeometry3D
                     TriangleIndices="0,1,2 3,4,5 "
                     Normals="0,0,1 0,0,1 0,0,1 0,0,1 0,0,1 0,0,1 "
                     TextureCoordinates="0,0 1,0 1,1 1,1 0,1 0,0 "
                     Positions="-0.5,-0.5,0.5 0.5,-0.5,0.5 0.5,0.5,0.5 0.5,0.5,0.5 -0.5,0.5,0.5 -0.5,-0.5,0.5 " />
                  </GeometryModel3D.Geometry>

                  <!-- The material specifies the material applied to the 3D object. In this sample a linear gradient 
                       covers the surface of the 3D object.-->
                  <GeometryModel3D.Material>
                    <MaterialGroup>
                      <DiffuseMaterial>
                        <DiffuseMaterial.Brush>
                          <LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">
                            <LinearGradientBrush.GradientStops>
                              <GradientStop Color="Yellow" Offset="0" />
                              <GradientStop Color="Red" Offset="0.25" />
                              <GradientStop Color="Blue" Offset="0.75" />
                              <GradientStop Color="LimeGreen" Offset="1" />
                            </LinearGradientBrush.GradientStops>
                          </LinearGradientBrush>
                        </DiffuseMaterial.Brush>
                      </DiffuseMaterial>
                    </MaterialGroup>
                  </GeometryModel3D.Material>

                  <!-- Apply a transform to the object. In this sample, a rotation transform is applied, rendering the 
                       3D object rotated. -->
                  <GeometryModel3D.Transform>
                    <RotateTransform3D>
                      <RotateTransform3D.Rotation>
                        <AxisAngleRotation3D Axis="0,3,0" Angle="40" />
                      </RotateTransform3D.Rotation>
                    </RotateTransform3D>
                  </GeometryModel3D.Transform>
                </GeometryModel3D>
              </ModelVisual3D.Content>
            </ModelVisual3D>
          </Viewport3D.Children>

        </Viewport3D>
      </Canvas>
    </Viewbox>
  </DockPanel>
</Page>

The code below shows how to create the same 3-D scene in procedural code.


Imports Microsoft.VisualBasic
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Media.Media3D

Namespace SDKSample
	Partial Public Class Basic3DShapeExample
		Inherits Page
		Public Sub New()

			' Declare scene objects.
			Dim myViewport3D As New Viewport3D()
			Dim myModel3DGroup As New Model3DGroup()
			Dim myGeometryModel As New GeometryModel3D()
			Dim myModelVisual3D As New ModelVisual3D()
			' Defines the camera used to view the 3D object. In order to view the 3D object,
			' the camera must be positioned and pointed such that the object is within view 
			' of the camera.
			Dim myPCamera As New PerspectiveCamera()

			' Specify where in the 3D scene the camera is.
			myPCamera.Position = New Point3D(0, 0, 2)

			' Specify the direction that the camera is pointing.
			myPCamera.LookDirection = New Vector3D(0, 0, -1)

			' Define camera's horizontal field of view in degrees.
			myPCamera.FieldOfView = 60

			' Asign the camera to the viewport
			myViewport3D.Camera = myPCamera
			' Define the lights cast in the scene. Without light, the 3D object cannot 
            ' be seen. Note: to illuminate an object from additional directions, create 
            ' additional lights.
            Dim myDirectionalLight As New DirectionalLight()
			myDirectionalLight.Color = Colors.White
			myDirectionalLight.Direction = New Vector3D(-0.61, -0.5, -0.61)

			myModel3DGroup.Children.Add(myDirectionalLight)

			' The geometry specifes the shape of the 3D plane. In this sample, a flat sheet 
			' is created.
			Dim myMeshGeometry3D As New MeshGeometry3D()

			' Create a collection of normal vectors for the MeshGeometry3D.
			Dim myNormalCollection As New Vector3DCollection()
			myNormalCollection.Add(New Vector3D(0,0,1))
			myNormalCollection.Add(New Vector3D(0,0,1))
			myNormalCollection.Add(New Vector3D(0,0,1))
			myNormalCollection.Add(New Vector3D(0,0,1))
			myNormalCollection.Add(New Vector3D(0,0,1))
			myNormalCollection.Add(New Vector3D(0,0,1))
			myMeshGeometry3D.Normals = myNormalCollection

			' Create a collection of vertex positions for the MeshGeometry3D. 
			Dim myPositionCollection As New Point3DCollection()
			myPositionCollection.Add(New Point3D(-0.5, -0.5, 0.5))
			myPositionCollection.Add(New Point3D(0.5, -0.5, 0.5))
			myPositionCollection.Add(New Point3D(0.5, 0.5, 0.5))
			myPositionCollection.Add(New Point3D(0.5, 0.5, 0.5))
			myPositionCollection.Add(New Point3D(-0.5, 0.5, 0.5))
			myPositionCollection.Add(New Point3D(-0.5, -0.5, 0.5))
			myMeshGeometry3D.Positions = myPositionCollection

			' Create a collection of texture coordinates for the MeshGeometry3D.
			Dim myTextureCoordinatesCollection As New PointCollection()
			myTextureCoordinatesCollection.Add(New Point(0, 0))
			myTextureCoordinatesCollection.Add(New Point(1, 0))
			myTextureCoordinatesCollection.Add(New Point(1, 1))
			myTextureCoordinatesCollection.Add(New Point(1, 1))
			myTextureCoordinatesCollection.Add(New Point(0, 1))
			myTextureCoordinatesCollection.Add(New Point(0, 0))
			myMeshGeometry3D.TextureCoordinates = myTextureCoordinatesCollection

			' Create a collection of triangle indices for the MeshGeometry3D.
			Dim myTriangleIndicesCollection As New Int32Collection()
			myTriangleIndicesCollection.Add(0)
			myTriangleIndicesCollection.Add(1)
			myTriangleIndicesCollection.Add(2)
			myTriangleIndicesCollection.Add(3)
			myTriangleIndicesCollection.Add(4)
			myTriangleIndicesCollection.Add(5)
			myMeshGeometry3D.TriangleIndices = myTriangleIndicesCollection

			' Apply the mesh to the geometry model.
			myGeometryModel.Geometry = myMeshGeometry3D

			' The material specifies the material applied to the 3D object. In this sample a  
			' linear gradient covers the surface of the 3D object.

			' Create a horizontal linear gradient with four stops.   
			Dim myHorizontalGradient As New LinearGradientBrush()
			myHorizontalGradient.StartPoint = New Point(0, 0.5)
			myHorizontalGradient.EndPoint = New Point(1, 0.5)
			myHorizontalGradient.GradientStops.Add(New GradientStop(Colors.Yellow, 0.0))
			myHorizontalGradient.GradientStops.Add(New GradientStop(Colors.Red, 0.25))
			myHorizontalGradient.GradientStops.Add(New GradientStop(Colors.Blue, 0.75))
			myHorizontalGradient.GradientStops.Add(New GradientStop(Colors.LimeGreen, 1.0))

			' Define material and apply to the mesh geometries.
			Dim myMaterial As New DiffuseMaterial(myHorizontalGradient)
			myGeometryModel.Material = myMaterial

			' Apply a transform to the object. In this sample, a rotation transform is applied,  
			' rendering the 3D object rotated.
			Dim myRotateTransform3D As New RotateTransform3D()
			Dim myAxisAngleRotation3d As New AxisAngleRotation3D()
			myAxisAngleRotation3d.Axis = New Vector3D(0,3,0)
			myAxisAngleRotation3d.Angle = 40
			myRotateTransform3D.Rotation = myAxisAngleRotation3d
			myGeometryModel.Transform = myRotateTransform3D

			' Add the geometry model to the model group.
			myModel3DGroup.Children.Add(myGeometryModel)

			' Add the group of models to the ModelVisual3d.
			myModelVisual3D.Content = myModel3DGroup

			' 
			myViewport3D.Children.Add(myModelVisual3D)

			' Apply the viewport to the page so it will be rendered.
			Me.Content = myViewport3D
		End Sub
	End Class
End Namespace

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, 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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