Hi @renyangfu, I am afraid that the Commerical Analytics showcase is not something we provide the source code for.
If you require advanced analytics for your VR eye tracking project, then we would recommend you checkout our software package designed
exactly for this need. Please check it out at @ https://vr.tobii.com/sdk/solutions/tobii-ocumen/
You could also look at the software provided by Cognitive 3D @ https://cognitive3d.com/ which provides a 30 day trial.