WPF实现3D立方体波浪墙效果

本文实例为大家分享了WPF实现3D立方体波浪墙效果的具体代码，供大家参考，具体内容如下

实现效果如下：

思路：仿照3D粒子系统，将粒子颗粒的Geometry改造为立方体，鼠标移动时将鼠标位置转为3D场景中的坐标。

步骤：

1、粒子类Particle.cs

public Point3D Position;//位置
public double Width;//长方体底面宽
public double Height;//长方体侧面高

2、粒子系统ParticleSystem.cs

private readonly List<Particle> _particleList;
private readonly GeometryModel3D _particleModel;
private readonly int CUBOIDHEIGHT = 20;
private readonly int MOUSERADIUS = 1000;
private int XParticleCount;
private int YParticleCount;
public Model3D ParticleModel => _particleModel;

public ParticleSystem(int amountX, int amountY, Color color)
    {
      XParticleCount = amountX;
      YParticleCount = amountY;

      _particleList = new List<Particle>();
      _particleModel = new GeometryModel3D { Geometry = new MeshGeometry3D() };
      var material = new DiffuseMaterial(new SolidColorBrush(color));
      _particleModel.Material = material;
    }

public void SpawnParticle(double size)
    {
      // 初始化粒子位置和大小
      for (int ix = 0; ix < XParticleCount; ix++)
      {
        for (int iy = 0; iy < YParticleCount; iy++)
        {
          var p = new Particle
          {
            Position = new Point3D(ix * size, iy * size, 0),
            Width = size,
            Height = CUBOIDHEIGHT,
          };
          _particleList.Add(p);
        }
      }
    }

public void Update(Point mp)
    {
      foreach (var p in _particleList)
      {
        //求点到圆心的距离
        double c = Math.Pow(Math.Pow(mp.X - p.Position.X, 2) + Math.Pow(mp.Y - p.Position.Y, 2), 0.5);
        p.Height = (MOUSERADIUS / (c + CUBOIDHEIGHT)) * CUBOIDHEIGHT;
      }
      UpdateGeometry();
    }

private void UpdateGeometry()
    {
      var positions = new Point3DCollection();
      var indices = new Int32Collection();

      for (var i = 0; i < _particleList.Count; ++i)
      {
        var positionIndex = i * 8;
        var p = _particleList[i];

        var p1 = new Point3D(p.Position.X, p.Position.Y, p.Position.Z);
        var p2 = new Point3D(p.Position.X + p.Width, p.Position.Y, p.Position.Z);
        var p3 = new Point3D(p.Position.X + p.Width, p.Position.Y + p.Width, p.Position.Z);
        var p4 = new Point3D(p.Position.X, p.Position.Y + p.Width, p.Position.Z);
        var p5 = new Point3D(p.Position.X, p.Position.Y, p.Position.Z + p.Height);
        var p6 = new Point3D(p.Position.X + p.Width, p.Position.Y, p.Position.Z + p.Height);
        var p7 = new Point3D(p.Position.X + p.Width, p.Position.Y + p.Width, p.Position.Z + p.Height);
        var p8 = new Point3D(p.Position.X, p.Position.Y + p.Width, p.Position.Z + p.Height);

        positions.Add(p1);
        positions.Add(p2);
        positions.Add(p3);
        positions.Add(p4);
        positions.Add(p5);
        positions.Add(p6);
        positions.Add(p7);
        positions.Add(p8);

        indices.Add(positionIndex);
        indices.Add(positionIndex + 1);
        indices.Add(positionIndex + 3);
        indices.Add(positionIndex + 1);
        indices.Add(positionIndex + 2);
        indices.Add(positionIndex + 3);
        indices.Add(positionIndex);
        indices.Add(positionIndex + 4);
        indices.Add(positionIndex + 3);
        indices.Add(positionIndex + 4);
        indices.Add(positionIndex + 7);
        indices.Add(positionIndex + 3);
        indices.Add(positionIndex + 4);
        indices.Add(positionIndex + 6);
        indices.Add(positionIndex + 7);
        indices.Add(positionIndex + 4);
        indices.Add(positionIndex + 5);
        indices.Add(positionIndex + 6);
        indices.Add(positionIndex);
        indices.Add(positionIndex + 4);
        indices.Add(positionIndex + 1);
        indices.Add(positionIndex + 1);
        indices.Add(positionIndex + 4);
        indices.Add(positionIndex + 5);
        indices.Add(positionIndex + 1);
        indices.Add(positionIndex + 2);
        indices.Add(positionIndex + 6);
        indices.Add(positionIndex + 6);
        indices.Add(positionIndex + 5);
        indices.Add(positionIndex + 1);
        indices.Add(positionIndex + 2);
        indices.Add(positionIndex + 3);
        indices.Add(positionIndex + 7);
        indices.Add(positionIndex + 7);
        indices.Add(positionIndex + 6);
        indices.Add(positionIndex + 2);
      }

      ((MeshGeometry3D)_particleModel.Geometry).Positions = positions;
      ((MeshGeometry3D)_particleModel.Geometry).TriangleIndices = indices;
 }

3、主窗体调用

xaml：

<Grid x:Name="mainGrid" Background="#0D6589" >
    <Viewport3D Name="myViewport" MouseLeave="Grid_MouseLeave" MouseMove="Grid_MouseMove">
      <Viewport3D.Camera>
        <PerspectiveCamera Position="-1500,3000,2200" LookDirection="1,-1,-1" UpDirection="0,0,1"/>
      </Viewport3D.Camera>
      <Viewport3D.Children>
        <ModelVisual3D>
          <ModelVisual3D.Content>
            <Model3DGroup x:Name="WorldModels">
              <DirectionalLight Color="White" Direction="-1,-1,-3" />
            </Model3DGroup>
          </ModelVisual3D.Content>
        </ModelVisual3D>
      </Viewport3D.Children>
    </Viewport3D>
</Grid>

交互逻辑：

private readonly ParticleSystem _ps;
private DispatcherTimer _frameTimer;
private Point pMouse = new Point(9999, 9999);

public MainWindow()
    {
      InitializeComponent();

      _frameTimer = new DispatcherTimer();
      _frameTimer.Tick += OnFrame;
      _frameTimer.Interval = TimeSpan.FromMilliseconds(100);
      _frameTimer.Start();

      _ps = new ParticleSystem(30, 30, Colors.White);
      WorldModels.Children.Add(_ps.ParticleModel);
      _ps.SpawnParticle(50);

      KeyDown += Window_KeyDown;
    }

    private void Window_KeyDown(object sender, KeyEventArgs e)
    {
      if (e.Key == Key.Escape)
        Close();
    }

    private void OnFrame(object sender, EventArgs e)
    {
      _ps.Update(pMouse);
    }

    private void Grid_MouseMove(object sender, MouseEventArgs e)
    {
      Point mouseposition = e.GetPosition(myViewport);
      PointHitTestParameters pointparams = new PointHitTestParameters(mouseposition);
      VisualTreeHelper.HitTest(myViewport, null, HTResult, pointparams);
    }

    /// <summary>
    /// 获取鼠标在场景中的3D坐标
    /// </summary>
    public HitTestResultBehavior HTResult(System.Windows.Media.HitTestResult rawresult)
    {
      RayHitTestResult rayResult = rawresult as RayHitTestResult;
      if (rayResult != null)
      {
        RayMeshGeometry3DHitTestResult rayMeshResult = rayResult as RayMeshGeometry3DHitTestResult;
        if (rayMeshResult != null)
        {
          GeometryModel3D hitgeo = rayMeshResult.ModelHit as GeometryModel3D;
          MeshGeometry3D hitmesh = hitgeo.Geometry as MeshGeometry3D;
          Point3D p1 = hitmesh.Positions.ElementAt(rayMeshResult.VertexIndex1);
          double weight1 = rayMeshResult.VertexWeight1;
          Point3D p2 = hitmesh.Positions.ElementAt(rayMeshResult.VertexIndex2);
          double weight2 = rayMeshResult.VertexWeight2;
          Point3D p3 = hitmesh.Positions.ElementAt(rayMeshResult.VertexIndex3);
          double weight3 = rayMeshResult.VertexWeight3;
          Point3D prePoint = new Point3D(p1.X * weight1 + p2.X * weight2 + p3.X * weight3, p1.Y * weight1 + p2.Y * weight2 + p3.Y * weight3, p1.Z * weight1 + p2.Z * weight2 + p3.Z * weight3);
          pMouse = new Point(prePoint.X, prePoint.Y);
        }
      }
      return HitTestResultBehavior.Continue;
    }

    private void Grid_MouseLeave(object sender, MouseEventArgs e)
    {
      pMouse = new Point(9999, 9999);
}

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