OpenPBR: rendering results changed between using MaterialX and Maya standard

[takahashi_masaki]

I have rendered the OpenPBR samples available on MaterialX's github and found that the results are different when transcribed to Maya's standard OpenPBR and when using vrayMaterialX (as well as in USD).
It seems that the problem is occurring in Transmission and Subsurface, could you please investigate?
We are aware of the following two points
- The internal units of subsurface_radius may be different between the Maya standard and MaterialX.
- Transmission_depth is not received properly from MaterialX, and any value is treated as 0.

open_pbr_glass cause unknown

open_pbr_honey Transmission_depth receipt is not working.

open_pbr_ketchup Units of subsurface_radius do not match?

open_pbr_pearl Units of subsurface_radius do not match?

[hermit.crab]

We are aware of the limitations and have already made significant progress in our internal builds. In there, when exporting either of those OpenPBR surface presets to MaterialX (via the V-Ray > Tools > Export materials to MaterialX tool), I get identical results. Those fixes will go to the stables builds soon enough.