https://gameinstitute.qq.com/community/detail/112744
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;
public class TestCommandBuffer : MonoBehaviour
{
public RenderTexture rt;
public Camera m_camera;
public GameObject cube;
public Shader shader;
CommandBuffer cb ;
Mesh quad;
void Start()
{
cb = new CommandBuffer();
cb.name = "testCb";
rt = new RenderTexture(m_camera.pixelWidth, m_camera.pixelHeight, 24);
cb.SetRenderTarget(rt);
cb.ClearRenderTarget(false, true, Color.red);
MeshFilter mf = cube.GetComponent<MeshFilter>();
Material mat = new Material(shader);
cb.DrawMesh(mf.mesh, Matrix4x4.identity, mat);
//Graphics.ExecuteCommandBuffer(cb);
m_camera.AddCommandBuffer(CameraEvent.AfterImageEffects, cb);
Graphics.Blit(rt, m_camera.targetTexture);
quad = new Mesh();
Vector3[] vertices = new Vector3[4];
vertices[0] = m_camera.ScreenToWorldPoint(new Vector3(0, 0, 10));
vertices[1] = m_camera.ScreenToWorldPoint(new Vector3(0, m_camera.pixelHeight, 10));
vertices[2] = m_camera.ScreenToWorldPoint(new Vector3(m_camera.pixelWidth, m_camera.pixelHeight, 10));
vertices[3] = m_camera.ScreenToWorldPoint(new Vector3(m_camera.pixelWidth, 0, 10));
Vector2[] uvs = new Vector2[4];
uvs[0] = new Vector2(0, 0);
uvs[1] = new Vector2(0, 1);
uvs[2] = new Vector2(1, 1);
uvs[3] = new Vector2(1, 0);
quad.vertices = vertices;
quad.uv = uvs;
}
private void Update()
{
CommandBuffer cb2 = new CommandBuffer();
Material mat = new Material(shader);
mat.SetTexture("_MainTex", rt);
cb2.DrawMesh(quad, Matrix4x4.identity, mat);
}
}