创建一个脚本 附加到一个游戏体上

 

using UnityEngine;

using System.Collections;

public class ProceduralTexture : MonoBehaviour

{

#region Public Variables

//纹理的宽高

public int widthHeight = 512;

//程序生成的纹理

public Texture2D generaterdTexture;

#endregion

#region Private Variables

private Material currentMaterial;

private Vector2 centerPosition;

#endregion

// Use this for initialization

void Start () {

if (!currentMaterial)

{

currentMaterial = transform.renderer.sharedMaterial;

if (!currentMaterial)

{

Debug.LogWarning("Cannot find a material on : " + transform.name);

}

}

if (currentMaterial)

{

centerPosition = new Vector2(0.5f, 0.5f);

generaterdTexture = GenerateParabola();

//设置纹理

currentMaterial.SetTexture("_MainTex",generaterdTexture);

}

}

private Texture2D GenerateParabola()

{

//创建一个新的纹理

Texture2D proceduralTexture = new Texture2D(widthHeight, widthHeight);

//获取当前纹理的中心点

Vector2 centerPixelPosition = centerPosition * widthHeight;

//循环遍历纹理的宽高 , 来为每个像素点赋值

for (int x = 0; x < widthHeight; x++)

{

for (int y = 0; y < widthHeight; y++)

{

//Get the distance from the center of the texture to

//our currently selected pixel

Vector2 currentPosition = new Vector2(x, y);

//当前像素点到中心点的距离 / 纹理宽高的一半

float pixelDistance = Vector2.Distance(currentPosition, centerPixelPosition) / (widthHeight * 0.5f);

// Mathf.Abs : 取绝对值 Mathf.Clamp 0-1

pixelDistance = Mathf.Abs(1 - Mathf.Clamp(pixelDistance, 0f, 1f));

pixelDistance = (Mathf.Sin(pixelDistance * 30.0f) * pixelDistance);

//you can also do some more advanced vector calculations to achieve

//other types of data about the model itself and its uvs and

//pixels

//以中心为原点 获取到当前像素点的向量

Vector2 pixelDirection = centerPixelPosition - currentPosition;

pixelDirection.Normalize();

//当前像素点向量 和 上左右三个方向的向量之间的夹角

float rightDirection = Vector2.Angle(pixelDirection, Vector3.right) / 360;

float leftDirection = Vector2.Angle(pixelDirection, Vector3.left) / 360;

float upDirection = Vector2.Angle(pixelDirection, Vector3.up) / 360;

//确保像素点的颜色值在 (0,1) 之间

//Create a new color value based off of our

//Color pixelColor = new Color(Mathf.Max(0.0f, rightDirection),Mathf.Max(0.0f, leftDirection), Mathf.Max(0.0f,upDirection), 1f);

Color pixelColor = new Color(pixelDistance, pixelDistance, pixelDistance, 1.0f);

//Color pixelColor = new Color(rightDirection, leftDirection, upDirection, 1.0f);

proceduralTexture.SetPixel(x, y, pixelColor);

//将中间的像素点设置成红色

if (x == widthHeight / 2 || y == widthHeight / 2)

{

Color middlePixelColor = new Color(1, 0, 0, 1.0f);

proceduralTexture.SetPixel(x, y, middlePixelColor);

}

}

}

//Finally force the application of the new pixels to the texture

proceduralTexture.Apply();

//return the texture to the main program.

return proceduralTexture;

}

// Update is called once per frame

void Update () {

}

}