OpenPBR

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Proposal: dual specular roughness sliders with mix

6

Throwing out for discussion the idea of having two specular roughness sliders mixed by a lerp (typically using a mask texture for the mix), similar to Megascans materials in Unreal....

sharktacos

Default value of transmission_dispersion_abbe_number is not between uisoftmin and uisoftmax

2

The soft min and max of that parameter are between 9.0 and 91.0, yet the default value is 0.0. I would have expected the default value to sit between the...

JGamache-autodesk

Add clamp of metal Fresnel to allow for specular_weight > 1

4

Rather than eliminating the `specular_weight` > 1 case (as proposed in #228), we discussed keeping this but fixing up the metal logic to ensure the Fresnel remains bounded. This makes...

portsmouth

Add emission_weight

4

Implements the change described in https://github.com/AcademySoftwareFoundation/OpenPBR/issues/229.  

portsmouth

UI disabling logic

6

Add section describing the "recommended logic needed to determine which of the parameters can be disabled". This describes the parameters which can safely be disabled (e.g. their UI element greyed...

portsmouth

Updating images to use the new shaderball, and adding some new images. Also indenting the anisotropy diagram to make it less distracting. 

portsmouth

MaterialX: support thin-walled dielectric

1

In OpenPBR's thin walled mode, we describe the behavior of the base dielectric as follows: >The translucent-base slab can be considered an infinitesimally thin sheet of dielectric (absorbing but non-scattering),...

portsmouth

In the spec we say: >The fuzz shading normal is assumed to inherit from that of the substrate layer, the physical picture being that the fuzz volume settles and conforms...

portsmouth

This effect described in the spec, which makes the absorption color of the coat more "contrasty" is missing from the MaterialX implementation.  The Arnold implementation for reference looks as...

portsmouth

Fix the coat darkening color shift

16

For reference, the issue with the coat darkening was this color shift that can happen in the presence of a strong coat color: I came up with this restatement of...

portsmouth