[AdrienHerubel]

Merges main (v1.1.2) into dev_1.2 so that the 1.2 development branch picks up the 1.1.2 patch release.

Because 1.1.1 reached main and dev_1.2 (#296) as separate squash commits, a plain merge produced many spurious conflicts. Conflicts were resolved using main's 1.1.1 commit as the common base, keeping the dev_1.2 structure and wording and porting the 1.1.2 changes on top.

Please merge with a merge commit (not squash), so that main stays an ancestor of dev_1.2 and future merges are clean.

Changes brought in from 1.1.2

Specification (index.html)

• Make T_coat notation consistent #304: Bold RGB notation $\mathbf{T}^2_\mathrm{coat}$ for the coat transmittance in the layering formulas, the reference implementation section and the mixture-of-lobes derivation.
• Define the default length unit for transmission_depth and subsurface_radius #331: Lengths default to centimeters: updated Metadata section, subsurface_radius and transmission_depth descriptions and parameter tables ("default unit: cm").
• Clarify orthonormalization policy for normals and tangents #287: Macronormal definition in the Microfacet model section, tangent references in the anisotropy summary, and the rewritten "Normal maps and tangents" section with the orthonormalization policy.
• Capitalize equation references #315: "equation [x]" references capitalized to "Equation [x]" throughout, including text that only exists in 1.2.
• Fix wrong symbol for normal in Oren Nayar equation #322: Oren-Nayar normal symbol fix.
• Fix missing link to some sections #309: Section name fixes in the mixture-of-lobes table ("Dielectric base", "Translucent base").
• Glossy-diffuse albedo wording ("bare glossy-diffuse slab with vacuum exterior") and the thin-walled subsurface clarifications, including the new Vlachos2010 reference.

Parametrization (parametrization.md.html)

• Define the default length unit for transmission_depth and subsurface_radius #331: Unit definition and (cm) defaults for transmission_depth and subsurface_radius.
• Improved UI names for (phase function) anisotropy of transmission/subsurface #284: "Scatter Anisotropy" labels.
• Fix subsurface_color range to indicate 3-dimensionality #325: subsurface_color range is $[0,1]^3$.

MaterialX (reference/open_pbr_surface.mtlx)

• Improved UI names for (phase function) anisotropy of transmission/subsurface #284: "Transmission Scatter Anisotropy" and "Subsurface Scatter Anisotropy" UI names.
• Kept the dev_1.2 versions of the nodedef version (1.2), the thin-walled subsurface graph (already equivalent to the Fix thin-walled subsurface color in MaterialX graph #321 fix) and the metallic Fresnel graph (Clamp metallic Fresnel after specular_weight scaling via F0 and F82 #316).

Examples, README, CHANGELOG

• Fix: invalid OpenPBR parameterizations in some mtlx examples #313: Example color fixes (brass, cesium, gold, lithium, potassium, rubidium, sodium) and the subsurface_radius/subsurface_radius_scale split for milk and petroleum.
• open_pbr_light_bulb_2700k.mtlx keeps emission_weight = 1, which main removed for 1.1.x but which 1.2 needs since emission_weight defaults to 0.
• README: Adobe OpenPBR BSDF reference (Add Adobe OpenPBR BSDF reference #299).
• CHANGELOG: main's new format, with the existing [1.2] - Unreleased section placed above 1.1.2 (unchanged, not yet converted to the new style).

Not changed

• The spec header still reads "Specification v1.1, 2024-06-28" on dev_1.2; to be updated with the 1.2 version bump.

Visual diff

Removed text in red, added text in green, comparing dev_1.2 before and after this merge.

Screenshots of each changed region, in document order (25)

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