あっちの窓の行列forUnity

acchi.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class WindowCamCont : MonoBehaviour {
    public Vector3 eyePos = new Vector3(0, 0, 0);
    public Camera targetCamera;
    public float displayWidth = 0.29f;
    public float displayHeight = 0.16f;
    public float nearPlane = 0;
    public float farPlane = 10;
    private Vector3 oldPos = Vector3.zero;
    private Matrix4x4 a = Matrix4x4.zero;


    // Use this for initialization
    void Start () {
	}
	// Update is called once per frame
	void Update () {
        
        float x = eyePos[0] ;
        float y = eyePos[1] ;
        float z = eyePos[2] ;
        float n = nearPlane- z;
        float f = farPlane - z;
        float w = displayWidth; w /= 2;
        float h = displayHeight; h /= 2;
        a[0, 0] = -z / w;
        a[0, 2] = x / w;
        a[1, 1] = -z / h;
        a[1, 2] = y / h;
        a[2, 2] = -1 * (z - f) / (n - f);
        a[2, 3] = -n * (z - f) / (n - f); 
        a[3, 2] = -1;
        a[3, 3] = -z;
        targetCamera.projectionMatrix = a;
        Vector3 pos= new Vector3(-x, -y, z);
        targetCamera.transform.Translate(pos-oldPos);
        oldPos = pos;
    }
}