why all the coords of the modelnet40 are in [-1,1]，shoud i normalize my data to this range?

[Reson]

i noticed that all the three coords of the modelnet40 are in [-1,1], are they preprocessed? shoud i normalize my data to this range?

[Matthew Broadhead]

I thought the same. I normalised my data to be in that range but I am still not getting very good results