The definition of the three angles

[TJsmartlzh]

Hello ,
Thanks for your great work in this project!
I have read your original paper Viewpoints and Keypoints, but I am a little confused about the accurate definition of vewpoints.

1. Are all the three angles defined as 0 when the object straightly faces the optical center of the camera?
2. Then is the sign of the angles defined by clockwise or counterclockwise?
3. Does this means that the viewpoint represent the R from camera coordinate to object coordinate?
4. If so, then does this mean that combining viewpoints from camera and R,T from world coordinate to camera coordinate, I can get the coordinate of the object in world coordinate?

By the way, I found that the link of pretrained model has already failed. Could you please update the link if possible?

Thanks a lot!