Partager via


Guide pratique pour appliquer du matériau à l’avant et à l’arrière d’un objet 3D

L’exemple suivant montre comment appliquer un Material à l’avant et à l’arrière d’un objet 3D et animer l’objet pour afficher les deux côtés de l’objet. La Material propriété d’un GeometryModel3D est utilisée pour appliquer un rouge Brush au côté avant de l’objet et la BackMaterial propriété de GeometryModel3D l’objet est utilisée pour appliquer un bleu Brush à l’arrière de l’objet. Le code ci-dessous montre l’application des matériaux à l’objet :

<!-- This material is applied to the front of the 3D object (red side).-->
<GeometryModel3D.Material>
  <MaterialGroup>
    <DiffuseMaterial>
      <DiffuseMaterial.Brush>
        <SolidColorBrush Color="Red"/>
      </DiffuseMaterial.Brush>
    </DiffuseMaterial>
  </MaterialGroup>
</GeometryModel3D.Material>

<!-- This material is applied to the back of the 3D object (blue side).-->
<GeometryModel3D.BackMaterial>
  <MaterialGroup>
    <DiffuseMaterial>
      <DiffuseMaterial.Brush>
        <SolidColorBrush Color="Blue"/>
      </DiffuseMaterial.Brush>
    </DiffuseMaterial>
  </MaterialGroup>
</GeometryModel3D.BackMaterial>

Exemple

Le code suivant montre l’ensemble de l’exemple.

<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 x:Name="myPerspectiveCamera" 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>
                  <!-- This material is applied to the front of the 3D object (red side).-->
                  <GeometryModel3D.Material>
                    <MaterialGroup>
                      <DiffuseMaterial>
                        <DiffuseMaterial.Brush>
                          <SolidColorBrush Color="Red"/>
                        </DiffuseMaterial.Brush>
                      </DiffuseMaterial>
                    </MaterialGroup>
                  </GeometryModel3D.Material>

                  <!-- This material is applied to the back of the 3D object (blue side).-->
                  <GeometryModel3D.BackMaterial>
                    <MaterialGroup>
                      <DiffuseMaterial>
                        <DiffuseMaterial.Brush>
                          <SolidColorBrush Color="Blue"/>
                        </DiffuseMaterial.Brush>
                      </DiffuseMaterial>
                    </MaterialGroup>
                  </GeometryModel3D.BackMaterial>
                  <!-- The Transform specifies how to transform the 3D object. The properties of the
                        Rotation object are animated causing the 3D object to rotate (see Storyboard below).-->
                  <GeometryModel3D.Transform>
                    <RotateTransform3D>
                      <RotateTransform3D.Rotation>
                        <AxisAngleRotation3D x:Name="myAngleRotation" 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. This animation is used to show
               both sides of the 3D object. -->
          <Viewport3D.Triggers>
            <EventTrigger RoutedEvent="Viewport3D.Loaded">
              <BeginStoryboard>
                <Storyboard>

                  <!-- This animation animates the Angle property of the AxisAngleRotation3D
                       making the 3D object rotate from -0 degrees to 360 degrees. -->
                  <DoubleAnimation 
                   Storyboard.TargetName="myAngleRotation" 
                   Storyboard.TargetProperty="Angle" 
                   From="0" To="360" Duration="0:0:4" AutoReverse="True"  RepeatBehavior="Forever"/>

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

Voir aussi