Comment : animer une rotation 3D à l'aide d'images clés
Mise à jour : novembre 2007
Dans l'exemple suivant, Rotation3DAnimationUsingKeyFrames est utilisé pour faire pivoter un objet en 3D pendant que son axe de rotation s'anime en créant une "déviation". Cette animation utilise les images clés suivantes :
LinearRotation3DKeyFrame est utilisé pour créer une interpolation linéaire fluide entre les valeurs.
DiscreteRotation3DKeyFrame est utilisé pour créer des "sauts" soudains entre les valeurs (aucune interpolation).
SplineRotation3DKeyFrame est utilisé pour créer une transition variable entre les valeurs en fonction de la propriété KeySpline. Dans l'exemple ci-dessous, cette partie de l'animation commence lentement et accélère de façon exponentielle vers la fin du segment temporel.
Exemple
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://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>
Voir aussi
Tâches
Comment : animer une rotation 3D à l'aide de tables de montage séquentiel
Comment : animer une rotation 3D à l'aide de Rotation3DAnimation
Comment : animer une rotation 3D à l'aide de quaternions
Comment : animer une rotation 3D à l'aide d'images clés (QuaternionAnimationUsingKeyFrames)