White paper describing the Autodesk Standard Surface shader.

Related tags

Miscellaneous arnold shader whitepaper surface
Overview

Autodesk Standard Surface



A white paper specifying an uber surface shader that aims to provide a material representation capable of accurately modeling the vast majority of materials used in practical visual effects and feature animation productions. It follows the design of the Standard Surface shader in the Arnold renderer, whose implementation is relatively uncomplicated and whose user interface consists of a small set of parameters with intuitive meanings and ranges. The white paper is versioned and will be updated as the specification evolves.

Resources

Discussion


License: CC BY-SA 4.0

Comments
  • Swap default values of 'base' and 'base_color' parameters

    Swap default values of 'base' and 'base_color' parameters

    Currently, we have the defaults base = 0.8 and base_color = (1, 1, 1). There has been feedback that users find themselves to changing base to 1 after connecting base_color to a texture. This is such a common use case that it's better to swap the two defaults and avoid having to adjust base every time.

    opened by iliyang 1
  • Incorrect anisotropy rotation specification

    Incorrect anisotropy rotation specification

    The anisotropy rotation specification says :
    orientation of anisotropy; range [0,1] (where 1 means 180 degrees)

    Instead if should be : orientation of anisotropy; range [0,1] (where 1 means 360 degrees)

    The reference implementation implements the correct behavior.

    opened by AdrienHerubel 0
  • Unused sheen default value?

    Unused sheen default value?

    Hi! The spec describes a default value of 0.8 for the weight of the sheen BRDF: https://autodesk.github.io/standard-surface/#closures/sheen

    However, in the implementations, the value is actually set to 0.0: https://github.com/Autodesk/standard-surface/blob/b34e081e0fdced603eaa87b1c2841f99986fde2e/reference/standard_surface.mtlx#L51 https://github.com/Autodesk/standard-surface/blob/b34e081e0fdced603eaa87b1c2841f99986fde2e/reference/standard_surface.osl#L177

    Is this because the layer is optional and the input serves as both weight and toggle?

    opened by pablode 0
  • Improve wording on MaterialX implementation inputs

    Improve wording on MaterialX implementation inputs

    The MaterialX implementation defines inputs that claim to take the "geometric" normal and the "geometric" tangent - I believe that this is incorrect, and that the shading normal is meant.

    opened by pablode 0
  • ND_surface should have color opacity

    ND_surface should have color opacity

    Currently opacity is defined as a float in ND_surface. There are many use cases (stained glass) where it would be good to have opacity defined as a color3.

    There's even a documented work-around in standard_surface.mtlx to convert the incoming color to a scalar value. Full color opacity is needed to reproduce the standard surface faithfully.

        <!-- Surface construction with opacity -->                                   
    <!-- Node <surface> only supports monochromatic opacity so use the luminance of input opacity color -->
    <luminance name="opacity_luminance" type="color3">

    It's easy to get a scalar value out of a color, it's not possible to get a color out of a scalar.

    opened by code-monkey 1
  • Thin film with Specular and Transmission

    Thin film with Specular and Transmission

    Hello,

    We have noticed an unexpected behavior about the thin film when using it with a specular and transmission. It seems that when the thin film is enabled the transmission is not handling the TIR anymore. Is this the expected behavior ?

    Here some images from Maya Arnold (MtoA 4.0.2 - 46d4a92e (master) - Feb 13 2020 03:01:44) that shows the issue :

    Here we can see that increasing the depth transmission change nothing when the thin film is enabled :

    New Project

    And if we are visualizing this LPE : CTT+TL which correspond to internal reflection we have the TIR for the case when there is no thin film for the depth 3 and 4 but there is nothing when the thin film is enabled.

    lpe

    Thanks,

    Kevin

    opened by ix-kcam 0
  • Fix OSL reference implementation

    Fix OSL reference implementation

    Either fix the OSL code or change aiStandard to match. Alternatively: clearly state that one or the other is not meant to be an implementation of this standard.

    See also #11.

    opened by virtualritz 1
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