CommandBuffer.SetViewProjectionMatrices

参数

描述

添加一个命令来设置视图和投影矩阵。

此函数等同于调用 SetViewMatrix 和 SetProjectionMatrix。当同时更改两个矩阵时，效率略高。

此函数与内置渲染管线兼容。它与通用渲染管线 (URP)、高清渲染管线 (HDRP) 或自定义可脚本化渲染管线不兼容。

注意：Unity 中的相机空间与 OpenGL 约定匹配，因此负 z 轴是相机的向前方向。这与通常的 Unity 约定不同，在通常的 Unity 约定中，相机的向前方向是正 z 轴。如果您正在手动创建视图矩阵，例如使用 Matrix4x4.LookAt 的逆矩阵，则需要沿 z 轴将其缩放 -1 以获得正确的视图矩阵。

using UnityEngine;
using UnityEngine.Rendering;

// Attach this script to a Camera and pick a mesh to render.
// When entering Play mode, this will render a green mesh at
// origin position, via a command buffer.
[RequireComponent(typeof(Camera))]
public class ExampleScript : MonoBehaviour
{
    public Mesh mesh;

    void Start()
    {
        var material = new Material(Shader.Find("Hidden/Internal-Colored"));
        material.SetColor("_Color", Color.green);

        var tr = transform;
        var camera = GetComponent<Camera>();

        // Code below does the same as what camera.worldToCameraMatrix would do. Doing
        // it "manually" here to illustrate how a view matrix is constructed.
        //
        // Matrix that looks from camera's position, along the forward axis.
        var lookMatrix = Matrix4x4.LookAt(tr.position, tr.position + tr.forward, tr.up);
        // Matrix that mirrors along Z axis, to match the camera space convention.
        var scaleMatrix = Matrix4x4.TRS(Vector3.zero, Quaternion.identity, new Vector3(1, 1, -1));
        // Final view matrix is inverse of the LookAt matrix, and then mirrored along Z.
        var viewMatrix = scaleMatrix * lookMatrix.inverse;

        var buffer = new CommandBuffer();
        buffer.SetViewProjectionMatrices(viewMatrix, camera.projectionMatrix);
        buffer.DrawMesh(mesh, Matrix4x4.identity, material);

        camera.AddCommandBuffer(CameraEvent.BeforeSkybox, buffer);
    }
}

其他资源：SetViewMatrix，SetProjectionMatrix，Camera.projectionMatrix，Matrix4x4.LookAt，Matrix4x4.Perspective.