MonoBehaviour.OnPostRender()

描述

事件函数，Unity 在相机渲染场景后调用。

在内置渲染管线中，Unity 会在相机渲染场景后立即对附加到与启用 Camera 组件相同的 GameObjects 上的 MonoBehaviour 调用 OnPostRender。使用 OnPostRender 在渲染循环的这一点执行您自己的代码；例如，如果您在 MonoBehaviour.OnPreRender 中更改了视觉效果，您可以在此处将其更改回来。 OnPostRender 可以是协程。

对于不需要脚本与 Camera 组件位于同一 GameObject 上的类似功能，请参阅 Camera.onPostRender。对于可脚本化渲染管线中的类似功能，请参阅 RenderPipelineManager。

要在 Unity 渲染所有相机和 GUI 后执行代码，请使用 WaitForEndOfFrame 或 CommandBuffer。

using UnityEngine;

// A script that when attached to the camera, makes the resulting
// colors inverted. See its effect in play mode.
public class ExampleClass : MonoBehaviour
{
    private Material mat;

    // Will be called from camera after regular rendering is done.
    public void OnPostRender()
    {
        if (!mat)
        {
            // Unity has a built-in shader that is useful for drawing
            // simple colored things. In this case, we just want to use
            // a blend mode that inverts destination colors.
            var shader = Shader.Find("Hidden/Internal-Colored");
            mat = new Material(shader);
            mat.hideFlags = HideFlags.HideAndDontSave;
            // Set blend mode to invert destination colors.
            mat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusDstColor);
            mat.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
            // Turn off backface culling, depth writes, depth test.
            mat.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Off);
            mat.SetInt("_ZWrite", 0);
            mat.SetInt("_ZTest", (int)UnityEngine.Rendering.CompareFunction.Always);
        }

        GL.PushMatrix();
        GL.LoadOrtho();

        // activate the first shader pass (in this case we know it is the only pass)
        mat.SetPass(0);
        // draw a quad over whole screen
        GL.Begin(GL.QUADS);
        GL.Vertex3(0, 0, 0);
        GL.Vertex3(1, 0, 0);
        GL.Vertex3(1, 1, 0);
        GL.Vertex3(0, 1, 0);
        GL.End();

        GL.PopMatrix();
    }
}

其他资源：Camera.onPostRender、MonoBehaviour.OnPreRender、MonoBehaviour.OnPreCull、CommandBuffer、使用 CommandBuffers 扩展内置渲染管线、WaitForEndOfFrame。