Unity-我可以制作2D镜子吗？ [英] Unity - Can I make a mirror in 2D?

问题描述

我正在制作自上而下的基于图块的2D游戏。在这个游戏中，我想将一堵墙变成一面镜子，就像您在此看到的那样一个>视频。现在，我知道预告片中的游戏是使用RPG Maker制作的，但是我想用Unity 3D制作我的游戏。

I am making a topdown tilebased 2D game. In this game, I want to make 1 of the walls into a mirror, like you can see on this video. Now, I know the game in the trailer is made in RPG Maker, but I want to make my game in Unity 3D.

我试图接下来设置摄像机在镜子上，在相机上添加RenderTexture并在Sprite上设置该纹理，但是当然不可能将RenderTexture转换为Sprite，因此最终无法正常工作。

I have tried to set a camera right next to the mirror, add a RenderTexture on the camera and set that texture on the Sprite, but of course it is not possible to convert a RenderTexture to a Sprite, so this did not end up working.

所以我的问题是，是否可以在预告片中创建一个镜像？

So my question is, is it possible to create a mirror like in the trailer?

推荐答案

可能会获得那种效果。只需将第二台摄像机作为角色的父项，然后使其随角色一起移动。

It is possible to get that effect. Just parent the second camera to your character and make it move with your character.

可以将 RenderTexture 转换为 Sprite 。首先，将 RenderTexture 转换为 Texture2D ，然后将 Texture2D 转换为 Sprite ， a href = https://docs.unity3d.com/ScriptReference/Sprite.Create.html rel = nofollow noreferrer> Sprite.Create 函数。

It is possible to convert RenderTexture to a Sprite. First of all, convert the RenderTexture to Texture2D then convert the Texture2D to Sprite with the Sprite.Create function.

最好禁用第二个或镜像相机，然后使用 mirrorCam.Render（）仅手动渲染它在需要的时候。以下脚本可以帮助您入门。将其附加到一个空的GameObject上，然后从编辑器中分配镜像相机和目标 SpriteRenderer ，它应该将相机看到的内容镜像到 SpriteRenderer 。不要忘记将 RenderTexture 插入镜像相机。

It is better to disable the second or mirror camera then use mirrorCam.Render() to manually render it only when you need to. The script below should get you started. Attach it to an empty GameObject then assign the mirror camera and the target SpriteRenderer from the Editor and it should mirror the what the camera is seeing to the SpriteRenderer. Don't forget to plugin RenderTexture to the mirror camera.

public class CameraToSpriteMirror: MonoBehaviour
{
    public SpriteRenderer spriteToUpdate;
    public Camera mirrorCam;

    void Start()
    {
        StartCoroutine(waitForCam());
    }

    WaitForEndOfFrame endOfFrame = new WaitForEndOfFrame();

    IEnumerator waitForCam()
    {
        //Will run forever in this while loop
        while (true)
        {
            //Wait for end of frame
            yield return endOfFrame;

            //Get camera render texture
            RenderTexture rendText = RenderTexture.active;
            RenderTexture.active = mirrorCam.targetTexture;

            //Render that camera
            mirrorCam.Render();

            //Convert to Texture2D
            Texture2D text = renderTextureToTexture2D(mirrorCam.targetTexture);

            RenderTexture.active = rendText;

            //Convert to Sprite
            Sprite sprite = texture2DToSprite(text);

            //Apply to SpriteRenderer
            spriteToUpdate.sprite = sprite;

        }
    }

    Texture2D renderTextureToTexture2D(RenderTexture rTex)
    {
        Texture2D tex = new Texture2D(rTex.width, rTex.height, TextureFormat.RGB24, false);
        tex.ReadPixels(new Rect(0, 0, rTex.width, rTex.height), 0, 0);
        tex.Apply();
        return tex;
    }

    Sprite texture2DToSprite(Texture2D text2D)
    {
        Sprite sprite = Sprite.Create(text2D, new Rect(0, 0, text2D.width, text2D.height), Vector2.zero);
        return sprite;
    }
}

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