调试易

WPF支持3D，但是不直接支持底层3D命令。如果点云的点量很大，可能效率上会跟不上。点本身是没有大小的，你可以把点画成一个小的立方（缺点是从不同方向观察，亮度可能随角度变化）。
以下例子用1万个点，每点画成一个面对观察点的小三角形。<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="450" Width="800">
    <Grid Background="DarkGray">
        <Viewport3D>
            <Viewport3D.Camera>
                <PerspectiveCamera Position="0,0,100" LookDirection="0,0,-1" FieldOfView="60" />
            </Viewport3D.Camera>
            <ModelVisual3D>
                <ModelVisual3D.Content>
                    <GeometryModel3D>
                        <GeometryModel3D.Geometry>
                            <MeshGeometry3D x:Name="mesh" />
                        </GeometryModel3D.Geometry>
                        <GeometryModel3D.Material>
                            <EmissiveMaterial Brush="Green" />
                        </GeometryModel3D.Material>
                    </GeometryModel3D>
                </ModelVisual3D.Content>
            </ModelVisual3D>
        </Viewport3D>
    </Grid>
</Window>using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Media3D;namespace WpfApp1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            var points = GenerateRandomPoints(10000);
            AddPointCloudMesh(points);
        }
        void AddPointCloudMesh(IEnumerable<Point3D> points)
        {
            var positions = new Point3DCollection();
            foreach(var p in points)
            {
                positions.Add(p);
                positions.Add(new Point3D(p.X, p.Y - 0.2, p.Z));
                positions.Add(new Point3D(p.X + 0.2, p.Y, p.Z));
            }
            this.mesh.Positions = positions;
            this.mesh.TriangleIndices = new Int32Collection(Enumerable.Range(0, positions.Count));
        }
        IEnumerable<Point3D> GenerateRandomPoints(int count)
        {
            Random random = new Random();
            for (int i = 0; i < count; i++)
            {
                yield return new Point3D()
                {
                    X = random.Next(random.Next(200000)) / 10000d * (1 - random.Next(2) * 2),
                    Y = random.Next(random.Next(200000)) / 10000d * (1 - random.Next(2) * 2),
                    Z = random.Next(random.Next(200000)) / 10000d * (1 - random.Next(2) * 2),
                };
            }
        }
    }
}

这样是一个办法，但是如果放大了就全是三角形，我现在用的PCL库，目前直接将PCL的代码编译成dll，然后c#调用dll显示