# How to: Animate a 3D Rotation Using Key Frames (QuaternionAnimationUsingKeyFrames)

In the following example, QuaternionAnimationUsingKeyFrames is used to make a 3D object rotate. 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.

## Example

<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 x:Name="myPerspectiveCamera" 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 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>
<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>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</MaterialGroup>
</GeometryModel3D.Material>

<!-- The Transform specifies how to transform the 3D object. The rotation
is animated using the Storyboard below. -->
<GeometryModel3D.Transform>
<RotateTransform3D>
<RotateTransform3D.Rotation>
<QuaternionRotation3D x:Name="myQuaternionRotation3D" />
</RotateTransform3D.Rotation>
</RotateTransform3D>
</GeometryModel3D.Transform>
</GeometryModel3D>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D.Children>

<!-- Trigger the rotation animation when the 3D object loads. -->
<Viewport3D.Triggers>
<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. -->
<QuaternionAnimationUsingKeyFrames
Storyboard.TargetName="myQuaternionRotation3D"
Storyboard.TargetProperty="Quaternion" >
<QuaternionAnimationUsingKeyFrames.KeyFrames>

<!-- Using a LinearQuaternionKeyFrame, the 3D object gradually rotates from an askew
position to a flat position. -->
<LinearQuaternionKeyFrame KeyTime="0:0:1" Value="0,0,1,0"  />

<!-- Using a DiscreteQuaternionKeyFrame, the object suddenly rotates to an askew
position. This happens immdeiately after the first 1 and a half seconds of the animation. -->
<DiscreteQuaternionKeyFrame KeyTime="0:0:1.5" Value="0.3, 0.3, 1, 0" />

<!-- Using a SplineQuaternionKeyFrame, the object rotates back to a flat position.
The animation starts out slowly at first and then speeds up. This KeyFrame ends
after the fourth second. -->
<SplineQuaternionKeyFrame KeySpline="0.6,0.0 0.9,0.00" KeyTime="0:0:4" Value="0,0,1,0" />

</QuaternionAnimationUsingKeyFrames.KeyFrames>
</QuaternionAnimationUsingKeyFrames>

</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Viewport3D.Triggers>
</Viewport3D>
</Canvas>
</Viewbox>
</DockPanel>
</Page>