Question about the starting position when stitching!

[brucetend]

Dear Authors: Thanks for your amazing works! But I'm really confused about the position information of this image. My panoramic pictures from Matterport3D are stitched in order 0-5. However, whether your rendered image is a depth image or an rgb image, it seems that there is a random rotation. What is the rotation relationship? I really cannot find the relationship directly.

best regards, Teng