WPF 3D纹理与alpha通道

Question

使用WPF 3D,是否可以使用带alpha通道的纹理？

我想制作一个三维场景,其中一切都是平面(就像一切都是纸张切口).我认为实现这一目标的最简单方法是创建一个平面,将其划分为相当多的三角形(如布料),然后应用具有透明背景的纹理.这样我就可以使用相同的几何体,只需换出纹理即可获得完全不同的形状.

我尝试将具有透明背景的PNG添加到模型作为画笔,但它显示为白色背景.WPF 3D是否提供此功能？怎么做到呢？

Answer 1

纹理与alpha确实在wpf中工作(它适用于我!).你确定你的png alpha好吗？

你需要一个在DiffuseMaterial中使用alpha的png.这是一块xaml,带有两个带纹理的平面网格相机.

替换png的路径,将其放入xaml文件并启动.你应该能够看到材料1的alpha后面的材料2.

<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="640.0" Height="480.0"   >
  <Grid.Resources>
    <MeshGeometry3D x:Key="Mesh" Positions="-4.999,-4.999,0.001 5.001,-4.999,0.001 -4.999,5.001,0.001 5.001,5.001,0.001 " TriangleIndices="2 0 3  1 3 0  " TextureCoordinates="0,0 1,0 0,1 1,1 "  />

      <DiffuseMaterial x:Key="material1" >
        <DiffuseMaterial.Brush>
          <ImageBrush ImageSource="C:\mypng.png" Transform="1,0,0,-1,0,1" />
        </DiffuseMaterial.Brush>
      </DiffuseMaterial>

      <DiffuseMaterial x:Key="material2" >
        <DiffuseMaterial.Brush>
         <ImageBrush ImageSource="C:\image_4.png"  Transform="1,0,0,-1,0,1"  />
        </DiffuseMaterial.Brush>
      </DiffuseMaterial>

  </Grid.Resources>
  <Viewport3D Width="640.0" Height="480.0" >
    <Viewport3D.Camera>
      <PerspectiveCamera  Position="0,0,20"/>
    </Viewport3D.Camera>

    <ModelVisual3D>
      <ModelVisual3D.Content>
        <Model3DGroup >

            <AmbientLight />

            <GeometryModel3D Geometry="{StaticResource Mesh}" Material="{StaticResource material2}">
             <GeometryModel3D.Transform>
              <MatrixTransform3D Matrix="1.0,0.0,0.0,0,0.0,1.0,0.0,0,0.0,0.0,1.0,0,0.0,0.0,-5.0,1" />
            </GeometryModel3D.Transform>
            </GeometryModel3D>

            <GeometryModel3D Geometry="{StaticResource Mesh}" Material="{StaticResource material1}">
            <GeometryModel3D.Transform>
              <MatrixTransform3D Matrix="1.0,0.0,0.0,0,0.0,1.0,0.0,0,0.0,0.0,1.0,0,0.0,0.0,0.0,1" />
            </GeometryModel3D.Transform>
            </GeometryModel3D>

        </Model3DGroup>
      </ModelVisual3D.Content>
    </ModelVisual3D>
  </Viewport3D>
</Grid>