https://docs.unity3d.com/Manual/class-Camera.html

camera.aspect = 0.5f //调整摄像机的宽高比为0.5

camera.fieldOfView = 60; //设置视场，Unity会根据aspect进行等比缩放

camera.rect = new Rect(0, 0, 2, 1); //设置视口,画面会按W/H进行拉申

camera.nearClipPlane = 1; //设置近裁剪面
camera.farClipPlane = 1000; //设置远裁剪面

camera.allowMSAA = true; //开启多重采样抗锯齿