unity在Game窗口绘制网格球

 

 

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

public class ShowSphereColider : MonoBehaviour
{
    //画线用的材质球
    Material lineMat;
    private float subdivide =305.7f; //细分数
    void OnEnable()
    {
        if (lineMat == null)
        {
            lineMat = Resources.Load<Material>("Materials/LineMat");
        }
        
    }
    void OnRenderObject()
    {
        SphereCollider sphereCollider = GetComponent<SphereCollider>();
        if (!sphereCollider.enabled||sphereCollider==null)
        {
            return;
        }
        Vector3 center = sphereCollider.center;
        float radius = sphereCollider.radius;
        lineMat.SetPass(0);
        GL.Begin(GL.LINES);
        GL.Color(Color.green);
        float step = 1.0f / subdivide ;
        for (float i=0; i < 1; i+=step)
        {
            
            Vector3 p1 = GraphLib.Circle(i, radius);
            Vector3 p = new Vector3(p1.x+center.x, p1.y+center.y, p1.z+center.z);
            p=transform.TransformPoint(p);
            GL.Vertex(p);
          
        }
        for (float i = step; i < 1.0f+step; i += step)
        {

            Vector3 p1 = GraphLib.Circle(i, radius);
            Vector3 p = new Vector3(p1.x + center.x, p1.y + center.y, p1.z + center.z);
            p = transform.TransformPoint(p);
            GL.Vertex(p);

        }
        GL.End();
        GL.Begin(GL.LINES);
        GL.Color(Color.green);
        for (float i = 0; i < 1; i += step)
        {
            Vector3 p1 = GraphLib.Circle(i, radius);
            Vector3 p = new Vector3(p1.x + center.x, p1.z + center.y, p1.y + center.z);
            p = transform.TransformPoint(p);
            GL.Vertex(p);
        }
        for (float i = step; i < 1.0f+step; i += step)
        {
            Vector3 p1 = GraphLib.Circle(i, radius);
            Vector3 p = new Vector3(p1.x + center.x, p1.z + center.y, p1.y + center.z);
            p = transform.TransformPoint(p);
            GL.Vertex(p);
        }
        GL.End();
        GL.Begin(GL.LINES);
        GL.Color(Color.green);
        for (float i = 0; i <1.0f; i += step)
        {
            Vector3 p1 = GraphLib.Circle(i, radius);
            Vector3 p = new Vector3(p1.y + center.x, p1.x + center.y, p1.z + center.z);
            p = transform.TransformPoint(p);
            GL.Vertex(p);
        }
        for (float i = step; i < 1.0f+step; i += step)
        {
            Vector3 p1 = GraphLib.Circle(i, radius);
            Vector3 p = new Vector3(p1.y + center.x, p1.x + center.y, p1.z + center.z);
            p = transform.TransformPoint(p);
            GL.Vertex(p);
        }
        GL.End();
    }

}

 

 

    //s角度  0-1之间  r:半径
    public static Vector3 Circle(float s,float r)
    {
        Vector3 p;
        p.x =r* Mathf.Cos(2*Mathf.PI * s);
        p.y = 0;
        p.z =r* Mathf.Sin(2*Mathf.PI * s);
        return p;
    }