using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MeshTest : MonoBehaviour
{
    MeshRenderer m_MeshRenderer;
    MeshFilter m_MeshFilter;
    Material m_Material;
    private Shader m_Shader;

    Mesh m_Mesh;
    Vector3[] pos = new Vector3[100];
    void Start()
    {
        Init();
        
        
        for (int i = 0; i < 100; i++)
        {
            pos[i] = new Vector3(i * 0.1f,0, i * 0.1f);
        }
        DrawCloud(pos);

    }
    void Init()
    {
        if (m_MeshRenderer == null)
        {
            m_MeshRenderer = gameObject.GetComponent<MeshRenderer>();
            if (m_MeshRenderer == null)
            {
                m_MeshRenderer = gameObject.AddComponent<MeshRenderer>();
            }
        }
        if (m_MeshFilter == null)
        {
            m_MeshFilter = gameObject.GetComponent<MeshFilter>();
            if (m_MeshFilter == null)
            {
                m_MeshFilter = gameObject.AddComponent<MeshFilter>();
            }
        }
        
        if (m_Mesh == null)
        {
            m_Mesh = new Mesh();
        }
        m_MeshFilter.mesh = m_Mesh;
        m_Material = m_MeshRenderer.material;

        m_MeshRenderer.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;
        m_MeshRenderer.lightProbeUsage = UnityEngine.Rendering.LightProbeUsage.Off;
        m_MeshRenderer.reflectionProbeUsage = UnityEngine.Rendering.ReflectionProbeUsage.Off;
    }
    public void DrawCloud(Vector3[] vers)
    {
        
        Debug.Log("绘制点云");
        
        int numPoints = vers.Length;

        int[] indices = new int[numPoints];
        Vector3[] pts = new Vector3[numPoints];
        Color32[] cols = new Color32[numPoints];

        for (int i = 0; i < numPoints; i++)
        {
            indices[i] = i;
            pts[i] = vers[i];
        }
        for (int i = 0; i < cols.Length; i++)
        {
            cols[i] = Color.green;
        }
        m_Mesh.Clear();
        m_Mesh.vertices = pts;
        m_Mesh.colors32 = cols;
        m_Mesh.SetIndices(indices, MeshTopology.Points, 0);
        m_Mesh.bounds = new Bounds(transform.position, new Vector3(float.MaxValue, float.MinValue, float.MaxValue));

        //m_Mesh.bounds = new Bounds(transform.position, new Vector3(0.1f, 0.1f, 0.1f));
        m_MeshFilter.mesh = m_Mesh;



    }
    private void OnRenderObject()
    {
        if ( m_Material != null)
        {
            m_MeshRenderer.enabled = true;

            
                m_Material.SetFloat("_PerspectiveEnabled", 1f);
                m_Material.SetFloat("_PointSize", 100f);
            
           
            m_Material.SetColor("_PointColor", Color.yellow);
        }
        else
        {
            m_MeshRenderer.enabled = false;
        }
    }

    void Update()
    {
        //if (Input.GetKeyDown(KeyCode.Mouse0))
        //{
        //    for (int i = 0; i < 100; i++)
        //    {
        //        pos[i] = -new Vector3(i, 0, 0);
        //    }
        //    DrawCloud(pos);
        //}
    }
}