DepthParticle.cs

using System;
using System.Linq;
using System.Threading;
using UnityEngine;
using Windows.Kinect;

public class DepthParticle : MonoBehaviour
{
    public MultiSourceManager multiSouceManager;
    public ParticleSystem particleSystem;
    public Color particleColor = new Color(0f, 1f, 0f, 1f);
    public float particleSize = 10f;
    public int shrink = 10;
    public float scale = 2f;

    private int width_, height_;

    private KinectSensor kinect_;
    private CameraSpacePoint[] cameraSpacePoints_;
    private ParticleSystem.Particle[] particles_;

    private Thread depthImageToParticleThread_;

    private bool isUpdateParticles = true;

    void Start()
    {
        kinect_ = KinectSensor.GetDefault();
        var frameDescription = kinect_.DepthFrameSource.FrameDescription;
        width_ = frameDescription.Width;
        height_ = frameDescription.Height;
        var size = width_ * height_;
        cameraSpacePoints_ = new CameraSpacePoint[size];
        particles_ = new ParticleSystem.Particle[size / shrink];

        depthImageToParticleThread_ = new Thread(DepthImageToParticleThreadFunc);
        depthImageToParticleThread_.Start();
    }

    void Update()
    {
        particleSystem.SetParticles(particles_, particles_.Length);
        particleSystem.startLifetime = 1f;

        if (Input.anyKeyDown) {
            isUpdateParticles ^= true;
        }
    }

    void OnApplicationQuit()
    {
        if (depthImageToParticleThread_.IsAlive) {
            depthImageToParticleThread_.Abort();
        }
    }

    void DepthImageToParticleThreadFunc()
    {
        try {
            _DepthImageToParticleThreadFunc();
        } catch (Exception e) {
            if (!(e is ThreadAbortException)) {
                Debug.LogError("Unexpected Death: " + e.ToString());
            }
        }
    }

    void _DepthImageToParticleThreadFunc()
    {
        for (;;) {
            Thread.Sleep(0);
            if (!kinect_.IsAvailable || !isUpdateParticles) continue;

            var raw = multiSouceManager.GetDepthData();
            var color = multiSouceManager.GetColorData();
            if (raw == null) continue;

            kinect_.CoordinateMapper.MapDepthFrameToCameraSpace(raw, cameraSpacePoints_);

            for (int i = 0, n = 0; i < particles_.Length && n < cameraSpacePoints_.Length; ++i, n += shrink) {
                if (raw[i] == 0) {
                    particles_[i].position = Vector3.zero;
                    particles_[i].color = Color.clear;
                    particles_[i].size = 0;
                    particles_[i].lifetime = -1f;
                } else {
                    var p = cameraSpacePoints_[n];
                    particles_[i].position = new Vector3(p.X, p.Y, p.Z) * scale;
                    particles_[i].color = particleColor;
                    particles_[i].size = particleSize;
                    particles_[i].lifetime = 1f;
                    particles_[i].velocity = Vector3.one;
                }
            }
        }
    }
}