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Hello,
I wonder if it is possible to change one or more points of a 3D object after it has been rendered. I tried it using XAML and C#.

I want to influence one of the points using a slider. This is the XAML-code that explains how I wanted to achieve a manipulation of the Y-dimension of the first point:

<Grid>
 <Viewport3D>
  <Viewport3D.Camera>
  <PerspectiveCamera Position="0.5, 0.5, 4" LookDirection="0,0,-1"/>
  </Viewport3D.Camera>
  <Viewport3D.Children>
  <ModelVisual3D>
  <ModelVisual3D.Content>
   <DirectionalLight Color="White" Direction="0,0,-1" />
  </ModelVisual3D.Content>
  </ModelVisual3D>
  <ModelVisual3D>
  <ModelVisual3D.Content>
   <GeometryModel3D>
   <GeometryModel3D.Geometry>
   <MeshGeometry3D Positions="0, {Binding ElementName=PunktSlider, Path=Value} ,1 , 1,0,1 , 1,1,1 , 0,1,1
       0,0,0 , 1,0,0 , 1,1,0 , 0,1,0"
     TriangleIndices="0 1 2, 2 3 0,
        1 5 6, 6 2 1,
        5 4 7, 7 6 5,
        4 0 3, 3 7 4,
        2 6 7, 7 3 2,
        0 4 5, 5 1 0" />
   </GeometryModel3D.Geometry>
   <GeometryModel3D.Transform>
   <RotateTransform3D>
    <RotateTransform3D.Rotation>
    <AxisAngleRotation3D Axis="1,1,1" Angle="{Binding ElementName=RotationSlider, Path=Value}" />
    </RotateTransform3D.Rotation>
   </RotateTransform3D>
   </GeometryModel3D.Transform>
   <GeometryModel3D.Material>
   <DiffuseMaterial Brush="OrangeRed" />
   </GeometryModel3D.Material>
   </GeometryModel3D>
  </ModelVisual3D.Content>
  </ModelVisual3D>
  </Viewport3D.Children>
 </Viewport3D>
 <Slider x:Name="RotationSlider" Minimum="0" Maximum="360" Value="0"/>
 <Slider x:Name="PunktSlider" Minimum="0" Maximum="1" Value="0"/>
 </Grid>

Does anyone have an idea how to do this?

Thanks in advance for every idea...
Posted 17-Jun-11 5:26am

1 solution

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Solution 1

Why not? What is your object you want to change? MeshGeometry3D?

Just give this object a name in XAML and do the changes programmatically.
See http://msdn.microsoft.com/en-us/library/system.windows.media.media3d.meshgeometry3d.aspx[^].
This CodeProject article explains manipulating mesh: WPF 3D Primer[^].

Have fun!

—SA
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