point_cloud.cs

using UnityEngine;

public class point_cloud : MonoBehaviour
{
    public Material material;
    protected int number = 20000000;
	protected ComputeBuffer compute_buffer;

	struct Point
	{
		public Vector3 position;
	}
	
	void Start ()
	{
		compute_buffer = new ComputeBuffer(number, sizeof(float)*3, ComputeBufferType.Default);
		Point[] cloud = new Point[number];     
		for (uint i=0; i<number; ++i) 
		{
			cloud[i]=new Point();
			cloud[i].position=new Vector3();
			cloud[i].position.x=Random.Range(-200.0f,200.0f);
			cloud[i].position.y=Random.Range(-200.0f,200.0f);
			cloud[i].position.z=Random.Range(-200.0f,200.0f);						 		
		}
		compute_buffer.SetData(cloud);	
	}
	
	void OnPostRender()
    {
        material.SetPass(0);
        material.SetBuffer("cloud", compute_buffer);
        Graphics.DrawProcedural(MeshTopology.Points, number, 1);
    }
 
    void OnDestroy()
    {
        compute_buffer.Release();
    }
}