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思路

创建全屏大小纹理，类型为TextureFormat.RGBA32。
创建纹理数组，大小为屏幕大小的4倍。
修改纹理数组数据，纹理应用修改后的数据。

示例

using UnityEngine;
using UnityEngine.UI;
public class TestTextureChange : MonoBehaviour
{[SerializeField] RawImage image;Texture2D texture;byte[] textureData;private void Awake(){texture = new Texture2D(Screen.width, Screen.height, TextureFormat.RGBA32, false);texture.filterMode = FilterMode.Point;texture.wrapMode = TextureWrapMode.Clamp;image.texture = texture;textureData = new byte[Screen.width * Screen.height * 4];texture.LoadRawTextureData(textureData);texture.Apply(false);}private void Update(){if (Input.GetMouseButtonDown(0)){       var xLength = Random.Range(0, Screen.width);var yLength = Random.Range(0, Screen.height);Color color = Color.white;color.r = Random.Range(0f, 1f);color.g = Random.Range(0f, 1f);color.b = Random.Range(0f, 1f);FillColor(xLength, yLength, color);}if (Input.GetMouseButtonUp(0))FillColor(Screen.width, Screen.height, Color.clear);}void FillColor(int x, int y, Color32 color){for (int i = 0; i < x; i++){for (int j = 0; j < y; j++)SetPixelColor(i, j, color);}texture.LoadRawTextureData(textureData);texture.Apply(false);}void SetPixelColor(int x, int y, Color32 color){if (x < 0 || y < 0 || x >= texture.width || y >= texture.height){return;}else{int index = (texture.width * y + x) * 4;textureData[index++] = color.r;textureData[index++] = color.g;textureData[index++] = color.b;textureData[index] = color.a;}}
}

层级结构

运行结果

按下鼠标左键，显示一个纯色矩形。
松开鼠标左键，清除纯色矩形。

知识

TextureFormat.RGBA32

橡皮檫制作思路

使用透明颜色，修改纹理数组。