What do the "P" and "D" in the Flag column of the parameter table of the mitsuba document stand for?

[satoshiSchubert]

Summary

What do the "P" and "D" in the Flag column of the parameter table of the mitsuba document stand for?

System configuration

System information:

Mitsuba version: mitsuba3

Description

When reading the official mitsuba documentation, the FLAG column of the parameter table may have P, ∂, D flags. I know that ∂ means differentiable, but I don't know what P and D represent respectively. They may have been explained somewhere in the documentation, but unfortunately I haven't found it yet, hoping for a simple explanation

[njroussel]

Hi @satoshiSchubert

Hovering over them should give you a tooltip explaining what they are used for. They're is also a small description here.

Basically, P means that they are exposed/modifiable through mi.traverse(). D is used to indicate that the parameter might introduce discontinuities when differentiating. And as you correctly mentionned already, ∂ is used to indicate whether or not the parameter is differentiable.

[satoshiSchubert]

Thanks for your quick reply!