Light source direction and code questions

[LiChen0506]

Dear Professor Smith： Recently, I am reading your academic paper <Linear depth estimation from an uncalibrated, monocular polarisation image>. My research direction is polarization 3D imaging. I hope to further study by reproducing the experimental results of your paper. During my further study, I encountered two questions: 1. The light source direction s=[2 0 7]' in the paper, there is no standard explanation for this representation, I hope you can guide. 2. In the implementation code of this paper, there is a data set of spec in the sample data, and the extraction code of this data set does not know whether it can be shared. I would be very honored to have your guidance. Thank you for taking the time to read the letter。 Good luck！