目录
四、程序开关其他脚本（Scripts）或物体（GameObject）
前言
我们在写unity脚本的时候，有时会碰到无法单纯使用手工拖拽或导入资产，需要程序脚本直接生成或控制一些资产的情况，因此本文的目的在于汇总这些操作方法。
一、程序生成贴图Texture
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ParamTexture : MonoBehaviour
{
public Texture2D proceduralTex;
public Color texColor;
private int width = 100;
private int height = 100;
// Start is called before the first frame update
void Start()
{
texColor = new Color(1.0f, 0, 0, 0);
proceduralTex = new Texture2D(width, height);
for(int i = 0; i < width/2; i++) {
for(int j = 0; j < height; j++) {
proceduralTex.SetPixel(i, j, texColor);
}
}
proceduralTex.Apply();
}
// Update is called once per frame
void Update()
{
}
}
说明：
需要新建一张贴图new Texture2D，然后使用for循环和SetPixel给每个像素上色。最后记得加上Apply应用。
把该脚本挂在主相机下，运行效果如下：
贴图如下：
二、程序生成材质Material
生成材质就是在有贴图的情况下新建一个材质并把贴图作为主贴图（MainTexture）赋给材质。
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ParamMaterial : MonoBehaviour
{
public Texture2D proceduralTex;
public Material proceduralMat;
public Color texColor;
private int width = 100;
private int height = 100;
public GameObject ball0;
// Start is called before the first frame update
void Start() {
texColor = new Color(1.0f, 0, 0, 0);
proceduralTex = new Texture2D(width, height);
proceduralMat = new Material(Shader.Find("Transparent/Diffuse"));
for (int i = 0; i < width / 2; i++) {
for (int j = 0; j < height / 2; j++) {
proceduralTex.SetPixel(i, j, texColor);
}
}
proceduralTex.Apply();
proceduralMat.mainTexture = proceduralTex;
ball0.GetComponent<MeshRenderer>().material = proceduralMat;
}
// Update is called once per frame
void Update() {
}
}
说明：
在Unity中新建一个球Sphere， 将该脚本挂在球上，需要注意的是材质需要指定一个shader，这里使用的是Transparent/Diffuse，将贴图指定给材质的mainTexture，最后记得给物体附上材质，获取MeshRenderer下面的material，将材质赋给它。
效果如下：
三、程序挂载脚本Scripts
首先准备一个需要挂载的脚本testScript.cs，效果是打开时会将物体尺寸放大5倍
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class testScript : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
this.transform.localScale = new Vector3(5, 5, 5);
}
// Update is called once per frame
void Update()
{
}
}
主代码如下：
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ParamScripts : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
GameObject temp = GameObject.Find("Sphere");
testScript script = temp.AddComponent<testScript>();
}
// Update is called once per frame
void Update()
{
}
}
说明：
主代码挂载在主相机上，启动项目时根据名称获取物体（“Sphere”），然后添加Component
效果如下： 
四、程序开关其他脚本（Scripts）或物体（GameObject）
开关脚本只需要在上一个案例中主代码添加一行
script.enabled = false;using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ParamScripts : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
GameObject temp = GameObject.Find("Sphere");
testScript script = temp.AddComponent<testScript>();
script.enabled = false;
}
// Update is called once per frame
void Update()
{
}
}
开关物体略有不同，需要在物体下添加一行
temp.SetActive(false);五、程序生成网格
思路如下：
首先根据顶点vertices、UV、三角关系triangles新建一个Mesh；
然后新建一个物体GameObject挂载MeshFilter和MeshRenderer，将第一步的Mesh赋给MeshFilter的mesh
代码如下：
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ParamMesh : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
//这里我们创建一个正方形网格，所以需要4个顶点、4个UV点和6条边
Vector3[] vertices = new Vector3[4];
Vector2[] uv = new Vector2[4];
int[] triangles = new int[6];
//声明顶点的位置
vertices[0] = new Vector3(0, 1);
vertices[1] = new Vector3(1, 1);
vertices[2] = new Vector3(0, 0);
vertices[3] = new Vector3(1, 0);
//声明UV的位置
uv[0] = new Vector2(0, 1);
uv[1] = new Vector2(1, 1);
uv[2] = new Vector2(0, 0);
uv[3] = new Vector2(1, 0);
//声明三角边，这里三角边是根据上面的顶点来进行连接的，每三个顶点构成一个三角边
//这里后面的int类型参数对应 vertices[]数组中的顶点
triangles[0] = 0;
triangles[1] = 1;
triangles[2] = 2;
triangles[3] = 2;
triangles[4] = 1;
triangles[5] = 3;
Mesh mesh = new Mesh();
//将设置好的参数进行赋值
mesh.vertices = vertices;
mesh.uv = uv;
mesh.triangles = triangles;
GameObject gameObject = new GameObject("Mesh", typeof(MeshFilter), typeof(MeshRenderer));
gameObject.transform.localScale = new Vector3(30, 30, 1);
gameObject.GetComponent<MeshFilter>().mesh = mesh;
}
// Update is called once per frame
void Update()
{
}
}
将该脚本挂在主相机下，运行效果如下（未添加材质因此显示为洋红色）：
