/// 脚本挂载到墙上

///

public class ImageFusion : MonoBehaviour {

public Texture2D bulletTexture; // 【图片】弹痕

private Texture2D wallTexture; // 【图片】墙

private Texture2D NewWallTexture; // 【图片】墙的备份

private float wall_height; // 【获取墙和弹痕图片的宽高信息】

private float wall_width;

private float bullet_height;

private float bullet_width;

RaycastHit hit; // 获取子弹打击点

private Queue uiQueues; // 存储像素点信息

// Use this for initialization

void Start () {

uiQueues = new Queue ();

wallTexture = GetComponent ().material.mainTexture as Texture2D;

// 【备份墙的图片】

NewWallTexture = Instantiate (wallTexture);

GetComponent ().material.mainTexture = NewWallTexture;

wall_height = wallTexture.height;

wall_width = wallTexture.width;

bullet_height = bulletTexture.height;

bullet_width = bulletTexture.width;

Debug.Log (wall_width);

Debug.Log (bullet_width);

}

// Update is called once per frame

void Update () {

if (Input.GetMouseButtonDown(0)) {

Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);

if (Physics.Raycast(ray,out hit)) {

if (hit.collider.name == "Plane") {

// 得到打击点的图片UV坐标

// UV坐标是当前图片宽高的百分比【左下角(0,0)，右上角(1,1)】

Vector2 uv = hit.textureCoord;

uiQueues.Enqueue (uv);

for (int i = 0; i < bullet_width; i++) {

for (int j = 0; j < bullet_height; j++) {

// 先减去弹痕宽度的一半得到最左边的坐标，依次向右递增

float w = uv.x * wall_width - bullet_width / 2 + i;

// 同理，从下到上递增

float h = uv.y * wall_height - bullet_height / 2 + j;

Color wallColor = NewWallTexture.GetPixel ((int)w,(int)h);

Color bulletColor = bulletTexture.GetPixel (i,j);

// 修改弹痕位置的像素为两图的融合颜色，若不相乘融合会使用弹痕原图

NewWallTexture.SetPixel ((int)w,(int)h,wallColor * bulletColor);

}

}

// 应用图片

NewWallTexture.Apply ();

Invoke ("ReturnWall",3f);

}

}

}

}

void ReturnWall()

{

// 还原以打击点为原点的图片像素点

Vector2 uv = uiQueues.Dequeue ();

for (int i = 0; i < bullet_width; i++) {

for (int j = 0; j < bullet_height; j++) {

float w = uv.x * wall_width - bullet_width / 2 + i;

float h = uv.y * wall_height - bullet_height / 2 + j;

// 使用原图的像素进行还原

Color wallColor = wallTexture.GetPixel ((int)w,(int)h);

NewWallTexture.SetPixel ((int)w,wallColor);

}

}

NewWallTexture.Apply ();

}

}