Question Regarding the Differences in grid_config in BEVDet and BEVDet_OCC Configurations

[lnSong]

Thank you for your great work on this repository! I have a question regarding the coordinate system used. Since this repository operates in the ego coordinate system, I noticed a difference between the grid_config settings in BEVDet and BEVDet_OCC. Specifically, in BEVDet, the z range is set to [-5, 3, 8], while in BEVDet_OCC, it is set to [-1, 5.4, 0.4]. Since the ground truth (GT) and occlusion ground truth (occ GT) are both in the ego coordinate system, could you clarify why these values are different?
感谢您的工作。我想问一下本repo是在ego坐标系下的，那为什么bevdet的配置文件中grid_config的'z': [-5, 3, 8]，而bevdet_occ配置中'z': [-1, 5.4, 0.4]，检测的gt和occ gt不都是ego坐标系吗？但是bevdet给出的z的范围看起来是lidar top坐标系的。