Julien Guertault

I was aware of this limitation of the metal-roughness parametrisation, but I thought this was a generally accepted caveat. If this happens to be a barrier to adoption, we should...

I think this issue is reasonably addressed by #157?

I believe this is the intended behaviour, where `transmission_depth` == 0 is a special case where the `transmission_color` is used as a simple multiplier, whereas any other value is the...

My understanding of light transport in volumes is limited, but I think so. As long as only `transmission_depth` and `transmission_color` are involved, I think it's straightforward (no pun intended), but...

In my experience, artists from the video game industry will expect to have an "opacity" parameter, and would likely be confused at a "presence" parameter.

Thank you for pointing this out. We could describe that the fuzz uses the normal of the layer underneath. In the case of partial coverage, that would be a blend...

Here are a few observations on our side: ## Specular weight for metal I don't have any feedback on this part and I suspect (to be confirmed) it is not...

After I implemented the fuzz model, I did some experiments. Since the Zeltner model reference implementation directly gives the reflectance (noted $R$ in the paper and $E_\text{fuzz}$ in the OpenPBR...

It's possible that I misunderstood something. At this point maybe it's simpler to discuss over a piece of code. I'll try to put together an minimal example.

> this PR seems to include much unrelated history. does it need to be rebased? Yes, most likely. I think I either didn't branch off the right point, or didn't...