unity点选构建Mesh并保存OBJ

最近有一份需求，就是让策划任意选择可一片区域，表明是有某种用途的。埋头写了两头，试了三四种方法，最终不得已用小方格来代替，并最终构建mesh保存下来，这样做程序的就很方便用了。我们的目标就是没有蛀牙oh，应该是累死别人，轻松自己！！！

1，简单shader编写

首先应该搞一个简单的Shader来显示我们的所编辑的内容

Shader "Custom/BlockShader" {
	Properties {
		_MainTex ("Base (RGB)", 2D) = "white" {}
		_Size ("Size",Vector) = (64,32,0,0) //在面板上显示长多少格，宽多少格
		_Color ("Color", Color) = (0,0,0,0.5)
		_RimColor ("Rim Color", Color) = (1,1,0,1)
		_RimPower ("Rim Power", Range(0,0.2)) = 0.01
		_HitPoint ("Hit Point",Vector) = (0.0,1,0.0,0.5)//鼠标点击点
		_SelectColor ("Select Color",Color) = (0,1,0,1)//选中颜色
		_HitColor ("Already hit Color", Color) = (0.2,0.8,0.9,0.5)
	}
	SubShader {
		Tags { "Queue"="Transparent" }
		
		CGPROGRAM
		#pragma surface surf Lambert alpha
		#pragma target 3.0

		sampler2D _MainTex;
		half4 _Size;
		fixed4 _Color;
		fixed4 _RimColor;
		float _RimPower;
		float4 _HitPoint;
		fixed4 _SelectColor;
		fixed4 _HitColor;

		struct Input {
			float2 uv_MainTex;
		};

		void surf (Input IN, inout SurfaceOutput o) {
			float2 uv = IN.uv_MainTex;
			fixed4 c = _Color;
			float radiox = 1.0 / (_Size.x * 2);//每格大小的一半
			float radioy = 1.0 / (_Size.y * 2);

			float nx = floor(uv.x/(radiox * 2)) * radiox * 2 + radiox;//找到格的中心点
			float ny = floor(uv.y/(radioy * 2)) * radioy * 2 + radioy;
			fixed4 tc = tex2D (_MainTex, float2(nx,ny) );
			if(tc.g > 0.85) //因为选中我设置为了绿色（0,1,0,1）
			{
				c = _HitColor;
				//if(uv.x >= nx-radiox && uv.x <nx+ radiox && uv.y >= ny-radioy && uv.y <= ny+radioy)
				//{ 
				//	c = _HitColor;
				//}
			}


			if(uv.x >= _HitPoint.x-radiox && uv.x <_HitPoint.x+ radiox && uv.y >= _HitPoint.y-radioy && uv.y <= _HitPoint.y+radioy)
			{ 
				c = _SelectColor;//选中颜色
			}

			if(fmod(uv.x ,(radiox * 2)) < (radiox * 2) * _RimPower)//边框
			{
				c = _RimColor;
			}
			if(fmod(uv.y ,(radioy * 2)) < (radioy * 2) * _RimPower)
			{
				c = _RimColor;
			}

			o.Albedo = c.rgb;
			o.Alpha = 0.5;
		}
		ENDCG
	} 
	FallBack "Diffuse"
}

我知道，以上写的很粗糙。。。但是，谁让我是pc上用的呢，谁还管效率是毛线

下一步，需要每套的脚本控制

2，脚本控制

主要是为了运行时，通过点击生成方格

using System.Collections.Generic;
using UnityEngine;

/**
 * 
 * 用于编辑器美术使用脚本，功能为画地形方块
 * 
 */
public class TerrianBlockControl : MonoBehaviour
{
    public int width;
    public int height;
    public Texture2D texture;
#if UNITY_EDITOR
    private Material material;
    private MeshRenderer meshRenderer;