OpenPBR

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Fix subsurface_color range to indicate 3-dimensionality

2

MAP233224

Roughening improvements

4

According to the discussion in https://github.com/AcademySoftwareFoundation/OpenPBR/issues/239 (and on Slack), we need to provide a less obviously wrong suggestion for the coat roughening effect. I wrote up the formula for the...

portsmouth

Revise and expand thin-film iridescence documentation

3

This PR revises and expands the thin-film iridescence section of the OpenPBR documentation. It includes: - A new paragraph describing the _locally spectral_ approach to modeling thin-film interference, as described...

peterkutz

Allow subsurface_radius_scale to go above 1

1

This PR removes the upper bound on the supported range of values for `subsurface_radius_scale`. This lets this parameter be used to decrease the volume density, not just increase it.

peterkutz

Some more openPBR example mtlx file that support texture maps?

1

as we could saw in the standard surface example, it provide a complete examples set that include how texture maps were used. but in openPBR's examples, only a few basic...

RichardBaoRepo

State orthonormalization policy for input normals and tangents

1

This issue was highlighted by Arnon Marcus in a Slack [discussion](https://academysoftwarefdn.slack.com/archives/C06365EAQMP/p1757198799809719): >I have a question about tangent vs normal inputs. For each pair (coat or geometry), is it expected that...

portsmouth

`transmission_dispersion_scale` -> `transmission_dispersion` ?

1

This is very minor, but this name `transmission_dispersion_scale ` seems unnecessarily long. It functions as the main slider for the dispersion effect, so why not just call it `transmission_dispersion`? (Then...

portsmouth

In the Arnold [volume shader ](https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_core_ac_standard_volume_html)we use the popular "dual HG lobe" parametrization that allows the phase function to be a mixture of forward and back-scattering. Plotting the phase function...

portsmouth

Some equation references in the spec are lowercase while some are uppercase. To be consistent with figure references and technical paper standards, and to clearly show that these references are...

peterkutz

Adding a short, rather minimal description of the retroreflectivity functionality to the spec. It currently references the unpublished white paper from Matthias, but it will be updated to something published...

portsmouth