红警框选功能

using UnityEngine;
using System.Collections;

/// <summary>
/// GL画框， 该脚本一定要挂载在摄像机上面才可以的
/// </summary>
public class CameraGL : MonoBehaviour
{
    public Material mat;      //把第一步建的材质托在上面
    public bool shouldDrawRect;
    public Vector2 startPos;
    public FrameSelect fs;

    void OnPostRender()
    {
        if (shouldDrawRect)
        {
            Vector2 endPos = Input.mousePosition;
            GL.PushMatrix();
            mat.SetPass(0);
            GL.LoadPixelMatrix();
            GL.Begin(GL.QUADS);
            GL.Vertex(startPos);
            GL.Vertex(new Vector3(startPos.x, endPos.y, 0));
            GL.Vertex(endPos);
            GL.Vertex(new Vector3(endPos.x, startPos.y, 0));
            GL.End();
            GL.PopMatrix();

            fs.selectSoliders.Clear();
            foreach (Solider m in fs.allSoliders)
            {
                Vector3 pos = m.transform.position;
                Vector3 tempPos = Camera.main.WorldToScreenPoint(pos);  //把世界坐标转化为屏幕坐标
                Vector3 p1 = startPos;
                Vector3 p2 = endPos;
                if (startPos.x < endPos.x)
                {
                    p1.x = endPos.x;
                    p2.x = startPos.x;
                }
                if (startPos.y < endPos.y)
                {
                    p1.y = endPos.y;
                    p2.y = startPos.y;
                }
                if (tempPos.x > p2.x && tempPos.x < p1.x && tempPos.y > p2.y && tempPos.y < p1.y)
                {
                    m.select= true;
                    fs.selectSoliders.Add(m);
                }
            }
        }
    }

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            shouldDrawRect = true;
            startPos = Input.mousePosition;
        }
        if (Input.GetMouseButtonUp(0))
        {
            shouldDrawRect = false;
        }
    }

}

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

/// <summary>
/// 框选控制
/// </summary>
public class FrameSelect : MonoBehaviour
{
    public List<Solider> allSoliders;

    public List<Solider> selectSoliders;

    void Awake()
    {
        selectSoliders = new List<Solider>();
    }

    void Update()
    {
        if(Input.GetKeyDown(KeyCode.Escape))
        {
            foreach (Solider item in selectSoliders)
            {
                item.select = false;
            }
            selectSoliders.Clear();
        }
    }

}

4士兵类

using UnityEngine;
using System.Collections;

/// <summary>
/// 每一个士兵挂载的类
/// </summary>
public class Solider : MonoBehaviour
{
    [SerializeField]
    private bool _select;

    [SerializeField]
    private Color color;

    void Awake()
    {
        _select = false;
        color = GetComponent<MeshRenderer>().material.color;
    }

    public bool select
    {
        set
        {
            _select = value;
            if (_select)
            {
                GetComponent<MeshRenderer>().material.color = Color.green;
            }
            else
            {
                GetComponent<MeshRenderer>().material.color = color;
            }
        }
        get
        {
            return _select;
        }
    }
}

大概的就是这样，具体的工程文件，我打成了包在下面的地址上面，可以下载，我用的unity版本是5.1.2f的，如果版本低了会打不开，版本高的话可能存在问题