废话不多说上代码，上图片，欢迎对Unity有兴趣的伙伴和我一起探讨学习

using UnityEngine;
using UnityEngine.UI;public class ScratchCardWithSpriteRenderer : MonoBehaviour
{// 公开背景和遮罩的Sprite Renderer组件public SpriteRenderer backgroundRenderer;public SpriteRenderer maskRenderer;// 遮罩原图的副本，用于保存未刮开状态private Texture2D originalMaskTexture;// 刮擦笔刷大小public float brushSize = 50f;void Start(){// 获取遮罩原图纹理并保存副本Texture2D maskTexture = maskRenderer.sprite.texture as Texture2D;originalMaskTexture = new Texture2D(maskTexture.width, maskTexture.height);originalMaskTexture.SetPixels(maskTexture.GetPixels());originalMaskTexture.Apply();}void Update(){// 当鼠标左键按下时if (Input.GetMouseButtonDown(0)){// 获取当前鼠标屏幕坐标Vector3 mousePosition = Input.mousePosition;// 转换为世界坐标，并投影到遮罩renderer所在的平面RaycastHit hit;Ray ray = Camera.main.ScreenPointToRay(mousePosition);if (Physics.Raycast(ray, out hit, Mathf.Infinity, LayerMask.GetMask("笔触"))) {Vector2 localPoint = hit.textureCoord;ApplyScratch(localPoint);}}}void ApplyScratch(Vector2 touchPosition){// 获取当前遮罩的Texture2DTexture2D currentMaskTexture = new Texture2D(maskRenderer.sprite.texture.width, maskRenderer.sprite.texture.height);currentMaskTexture.SetPixels(maskRenderer.sprite.texture.GetPixels());// 计算刮擦矩形区域int xMin = Mathf.FloorToInt(touchPosition.x * currentMaskTexture.width - brushSize / 2);int xMax = Mathf.CeilToInt(touchPosition.x * currentMaskTexture.width + brushSize / 2);int yMin = Mathf.FloorToInt(touchPosition.y * currentMaskTexture.height - brushSize / 2);int yMax = Mathf.CeilToInt(touchPosition.y * currentMaskTexture.height + brushSize / 2);// 限制刮擦区域在纹理内xMin = Mathf.Clamp(xMin, 0, currentMaskTexture.width);xMax = Mathf.Clamp(xMax, 0, currentMaskTexture.width);yMin = Mathf.Clamp(yMin, 0, currentMaskTexture.height);yMax = Mathf.Clamp(yMax, 0, currentMaskTexture.height);// 对刮擦区域设置透明色for (int x = xMin; x < xMax; x++){for (int y = yMin; y < yMax; y++){currentMaskTexture.SetPixel(x, y, Color.clear);}}// 应用刮擦结果currentMaskTexture.Apply();maskRenderer.sprite = Sprite.Create(currentMaskTexture, new Rect(0, 0, currentMaskTexture.width, currentMaskTexture.height), Vector2.one * 0.5f);}
}