創建線框3D立方體

Question

我有這樣的代碼繪製在WPF的Viewport3D立方體：

 <Viewport3D Name="viewport3D1"> 
      <Viewport3D.Camera> 
       <PerspectiveCamera x:Name="camMain" Position="6 5 4" LookDirection="-6 -5 -4"> 
       </PerspectiveCamera> 
      </Viewport3D.Camera> 
      <ModelVisual3D> 
       <ModelVisual3D.Content> 
        <DirectionalLight x:Name="dirLightMain" Direction="-1,-1,-1"> 
        </DirectionalLight> 
       </ModelVisual3D.Content> 
      </ModelVisual3D> 
      <ModelVisual3D> 
       <ModelVisual3D.Content> 
        <GeometryModel3D> 
         <GeometryModel3D.Geometry> 
          <MeshGeometry3D x:Name="meshMain" 
           Positions="0 0 0 1 0 0 0 1 0 1 1 0 0 0 1 1 0 1 0 1 1 1 1 1" 
           TriangleIndices="2 3 1 2 1 0 7 1 3 7 5 1 6 5 7 6 4 5 6 2 0 2 0 4 2 7 3 2 6 7 0 1 5 0 5 4"> 
          </MeshGeometry3D> 
         </GeometryModel3D.Geometry> 
         <GeometryModel3D.Material> 
          <DiffuseMaterial x:Name="matDiffuseMain"> 
           <DiffuseMaterial.Brush> 
            <SolidColorBrush Color="Red"/> 
           </DiffuseMaterial.Brush> 
          </DiffuseMaterial> 
         </GeometryModel3D.Material> 
        </GeometryModel3D> 
       </ModelVisual3D.Content> 
      </ModelVisual3D> 
     </Viewport3D> 

此給出以下結果：

如何使呈現爲線框？

Answer 1

看一看在（免費）螺旋3D工具包LinesVisual3D類（https://github.com/helix-toolkit）。這是「屏幕空間線」的一個版本，可以讓您像示例一樣繪製線框。

如果您正在做任何WPF 3D工作，我強烈建議Helix 3D Toolkit。

Answer 2

也許這可以幫助：

   <GeometryModel3D.Material> 
        <DiffuseMaterial x:Name="matDiffuseMain"> 
         <DiffuseMaterial.Brush> 
          <SolidColorBrush Color="Red" Opacity="0.5" /> 
         </DiffuseMaterial.Brush> 
        </DiffuseMaterial> 
       </GeometryModel3D.Material> 
       <GeometryModel3D.BackMaterial> 
        <DiffuseMaterial x:Name="matDiffuseMain2"> 
         <DiffuseMaterial.Brush> 
          <SolidColorBrush Color="Red" Opacity="0.5" /> 
         </DiffuseMaterial.Brush> 
        </DiffuseMaterial> 
       </GeometryModel3D.BackMaterial>