Question about "compatible"

[supertan0204]

Hi, thanks for releasing the codes for this amazing work.

A little simple question here: I noticed that in save_ply method of your GaussianRenderer class, there is a parameter compatible. When this is set to be True (and by default it does), it applied some "inverse activation" on scale, opacity and shs on Gaussians.

May I ask what is the purpose of this parameter? I didn't see you apply those "inverse activation" when you render a 3dgs scene in your codes, so why do you need to apply those changes when you specifically want to save to a .ply file?

Thanks a lot for your time.