Texture2D.ReadPixels

参数

描述

将屏幕像素读取到保存的纹理数据中。

这会将当前处于激活状态的 RenderTexture 或视图（由 source 参数指定）中的矩形像素区域复制到 由 destX 和 destY 定义的位置。两个坐标都使用像素空间 - (0,0) 为左下方。

如果 recalculateMipMaps 设置为 true，则还将更新纹理的 Mip 贴图。如果 recalculateMipMaps 设置为 false，则必须调用 Apply 对其进行重新计算。

当渲染目标具有类似的格式时（例如，通常的 32 或 16 位渲染纹理），该函数适用于 ARGB32、ARGB32 和 RGB24 纹理格式。 此外，该函数还支持从 HDR 渲染目标（ARGBFloat 或 ARGBHalf 渲染纹理格式）读入 HDR 纹理格式（RGBAFloat 或 RGBAHalf）。

纹理还必须在导入设置中设置了 Read/Write Enabled 标志。

// Attach this script to a Camera
//Also attach a GameObject that has a Renderer (e.g. a cube) in the Display field
//Press the space key in Play mode to capture

using UnityEngine;

public class Example : MonoBehaviour
{
    // Grab the camera's view when this variable is true.
    bool grab;

    // The "m_Display" is the GameObject whose Texture will be set to the captured image.
    public Renderer m_Display;

    private void Update()
    {
        //Press space to start the screen grab
        if (Input.GetKeyDown(KeyCode.Space))
            grab = true;
    }

    private void OnPostRender()
    {
        if (grab)
        {
            //Create a new texture with the width and height of the screen
            Texture2D texture = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);
            //Read the pixels in the Rect starting at 0,0 and ending at the screen's width and height
            texture.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0, false);
            texture.Apply();
            //Check that the display field has been assigned in the Inspector
            if (m_Display != null)
                //Give your GameObject with the renderer this texture
                m_Display.material.mainTexture = texture;
            //Reset the grab state
            grab = false;
        }
    }
}

另请参阅：EncodeToPNG。