Camera.targetTexture和SetTargetBuffers的区别

知识点1：Camera.targetTexture

https://docs.unity3d.com/ScriptReference/Camera-targetTexture.html
public RenderTexture targetTexture;

usually cameras render directly to screen, but for some effects it is useful to make a camera render into a texture.
this is done by creating a RenderTexture object and setting it as targetTexture on the camera. the camera will then render into that texture.

when targetTexture is null, camera renders to screen.
when rendering into a texture, the camera always renders into the whole texture;
it is also possible to make camera render into separate RenderBuffers, or into multiple textures at once, using SetTargetBuffers function.

知识点2：Camera.ImageEffects

这里会有一个Camera.ImageEffects，这是后处理效果。我猜测是OnRenderImage的方法调用。
这是将TempBuffer中的内容拷贝到BackBuffer的过程。
而RenderTexture.ResolveAA则是因为相机开启了抗锯齿。如果我们把它关闭了，则不会有这行了。

知识点3：Camera.targetTexture和SetTargetBuffers的区别

如果我们使用下面的代码：

using UnityEngine;

public class SetTargetBuffers : MonoBehaviour
{
    public Camera m_camera;
    public RenderTexture rt;
    void Start()
    {
        
        rt = new RenderTexture(m_camera.pixelWidth, m_camera.pixelHeight, 0);
        rt.name = "xxx";
        m_camera.targetTexture = rt;
        //m_camera.SetTargetBuffers(rt.colorBuffer, rt.depthBuffer);
    }

    private void OnPostRender()
    {
        Debug.LogError(RenderTexture.active);
    }
}

而如果使用这样的代码：

using UnityEngine;

public class SetTargetBuffers : MonoBehaviour
{
    public Camera m_camera;
    public RenderTexture rt;
    void Start()
    {
        
        rt = new RenderTexture(m_camera.pixelWidth, m_camera.pixelHeight, 0);
        rt.name = "xxx";
        //m_camera.targetTexture = rt;
        m_camera.SetTargetBuffers(rt.colorBuffer, rt.depthBuffer);
    }

    private void OnPostRender()
    {
        Debug.LogError(RenderTexture.active);
    }
}

后者没有了ImageEffects的调用了。

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标签：rt,Camera,SetTargetBuffers,camera,targetTexture,RenderTexture,public
来源： https://blog.csdn.net/wodownload2/article/details/104424005