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DiscreteRotation3DKeyFrame Class

Animates from the Rotation3D value of the previous key frame to its own Value using discrete interpolation.

Namespace:  System.Windows.Media.Animation
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 class DiscreteRotation3DKeyFrame : Rotation3DKeyFrame
<DiscreteRotation3DKeyFrame .../>

This class is used as part of a Rotation3DKeyFrameCollection in conjunction with a Rotation3DAnimationUsingKeyFrames object to animate a Rotation3D property value along a set of key frames.

A key frame defines a segment of the Rotation3DAnimationUsingKeyFrames to which it belongs. Each key frame has a target Value and a KeyTime. The KeyTime specifies the time at which the key frame's Value should be reached. A key frame animates from the target value of the previous key frame to its own target value. It starts when the previous key frame ends and ends when its own key time is reached.

In the following example, Rotation3DAnimationUsingKeyFrames is used to make a 3D object rotate while its axis of rotation animates resulting in a "wobble". This animation uses the following key frames:

  1. LinearRotation3DKeyFrame is used to create a smooth, linear interpolation between values.

  2. DiscreteRotation3DKeyFrame is used to create sudden "jumps" between values (no interpolation).

  3. SplineRotation3DKeyFrame is used to create a variable transition between values depending on the KeySpline property. In the example below, this part of the animation starts off slow but toward the end of the time segment, speeds up exponentially.

<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 Name="MyAnimatedObject"
          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>

            <!-- Two ModelVisual3D define the lights cast in the scene. Without light, the
                 3D object cannot be seen. Also, the direction of the lights affect shadowing. -->
            <ModelVisual3D>
              <ModelVisual3D.Content>
                <DirectionalLight Color="#FFFFFF" Direction="-0.612372,-0.5,-0.612372" />
              </ModelVisual3D.Content>
            </ModelVisual3D>
            <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 case, 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 plane. In this case it is a linear gradient.-->
                  <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>

                  <!-- The Transform specifies how to transform the 3D object. The properties of the
                        Rotation object are animated causing the 3D object to rotate and "wobble" (see Storyboard below).-->
                  <GeometryModel3D.Transform>
                    <RotateTransform3D x:Name="myRotateTransform3D" >
                      <RotateTransform3D.Rotation>
                        <AxisAngleRotation3D Axis="0,3,0" Angle="40" />
                      </RotateTransform3D.Rotation>
                    </RotateTransform3D>
                  </GeometryModel3D.Transform>
                </GeometryModel3D>
              </ModelVisual3D.Content>
            </ModelVisual3D>
          </Viewport3D.Children>

          <!-- Trigger the rotation animation when the 3D object loads. -->
          <Viewport3D.Triggers>
            <EventTrigger RoutedEvent="Viewport3D.Loaded">
              <BeginStoryboard>
                <Storyboard>

                  <!-- This animation animates the Rotation property of the RotateTransform
                       causing the 3D shape to rotate and wobble as the rotation angle and 
                       axis are animated. -->
                  <Rotation3DAnimationUsingKeyFrames
                   Storyboard.TargetName="myRotateTransform3D" 
                   Storyboard.TargetProperty="Rotation" >
                    <Rotation3DAnimationUsingKeyFrames.KeyFrames>

                      <!-- Using a LinearRotation3DKeyFrame, the object gradually rotates to an angle 
                           of -60 degrees while the axis of rotation shifts (animates) to a new value. -->
                      <LinearRotation3DKeyFrame KeyTime="0:0:1">
                        <LinearRotation3DKeyFrame.Value>
                          <AxisAngleRotation3D Axis="1,0,1" Angle="-60" />
                        </LinearRotation3DKeyFrame.Value>
                      </LinearRotation3DKeyFrame>

                      <!-- Using a DiscreteRotation3DKeyFrame, the object suddenly rotates to the an angle 
                           of 80 degrees on a new axis. This happens immdeiately after the first 1 and 
                           a half seconds of the animation. -->
                      <DiscreteRotation3DKeyFrame KeyTime="0:0:1.5">
                        <DiscreteRotation3DKeyFrame.Value>
                          <AxisAngleRotation3D Axis="0,0,1" Angle="80" />
                        </DiscreteRotation3DKeyFrame.Value>
                      </DiscreteRotation3DKeyFrame>

                      <!-- Using a SplineRotation3DKeyFrame, the object rotates back to its starting position. 
                           The animation starts out slowly at first and then speeds up. This KeyFrame ends 
                           after the fourth second. -->
                      <SplineRotation3DKeyFrame KeySpline="0.6,0.0 0.9,0.00" KeyTime="0:0:4">
                        <SplineRotation3DKeyFrame.Value>
                          <AxisAngleRotation3D Axis="0,3,0" Angle="40" />
                        </SplineRotation3DKeyFrame.Value>
                      </SplineRotation3DKeyFrame>

                    </Rotation3DAnimationUsingKeyFrames.KeyFrames>
                  </Rotation3DAnimationUsingKeyFrames>

                </Storyboard>
              </BeginStoryboard>
            </EventTrigger>
          </Viewport3D.Triggers>
        </Viewport3D>
      </Canvas>

    </Viewbox>
  </DockPanel>
</Page>
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

.NET Framework

Supported in: 3.5, 3.0
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