<commit_before>.. _label_as_subsurface:

.. fix_img_align::

|
 
.. image:: /_images/icons/asSubsurface.png
   :width: 128px
   :align: left
   :height: 128px
   :alt: Subsurface

asSubsurface
************

A raytraced, no precomputed required, subsurface-scattering material with a coupled specular term. This node capable of modelling a wide range of appearance thanks to built-in support for several diffusion profiles. 

|

Parameters
----------

.. bogus directive to silence warnings::

-----

Subsurface Parameters
^^^^^^^^^^^^^^^^^^^^^

*Subsurface Profile*
    The diffusion profiles to use in the BSSDRF [#]_. This parameter can take the following values

    * Better Dipole
    * Directional Dipole :cite:`Frisvad:2014:DDM:2702692.2682629`
    * Gaussian :cite:`dEon:2007:ERH:2383847.2383869`
    * Normalized Diffusion :cite:`Christensen:2015:ARP:2775280.2792555`
    * Standard Dipole :cite:`Jensen:2001:PMS:383259.383319`, :cite:`Donner:2005:LDM:1186822.1073308`
    * Random Walk :cite:`Meng:2016:IDS:3071773.3071778`
    
*Reflectance*
    The surface reflectance.

*SSS Amount*
    A scaling factor for the overall contribution of the subsurface scattering term.

*Mean Free Path*
    Mean free path [#]_ controls how deep light can travel within the volume, scattering internally, until it's fully absorbed or exits the medium. Lower values in the limit would have a response similar to a diffuse term, while high values would allow light to travel almost unhindered, producing a translucent like appearance.

*MFP Scale*
    An overall scaling factor for the *Mean Free Path*.

*Zero Scattering Weight*
    When sthe *Subsurface Profile* is set to *Random Walk*, when the surface is very thin and the *Mean Free Path* very high, it's possible for the light to travel through the object volume without scattering internally. This parameter provides the ability to scale the intensity of such an event, which typically produces a whiter more translucent like appearance on thin edges.

SSS Advanced Parameters
"""""""""""""""""""""""

*SSS Ray Depth*
    The maximum ray depth allowed for a ray of type *subsurface*.<commit_msg>Remove zero scattering references from docs<commit_after>.. _label_as_subsurface:

.. fix_img_align::

|
 
.. image:: /_images/icons/asSubsurface.png
   :width: 128px
   :align: left
   :height: 128px
   :alt: Subsurface

asSubsurface
************

A raytraced, no precomputed required, subsurface-scattering material with a coupled specular term. This node capable of modelling a wide range of appearance thanks to built-in support for several diffusion profiles. 

|

Parameters
----------

.. bogus directive to silence warnings::

-----

Subsurface Parameters
^^^^^^^^^^^^^^^^^^^^^

*Subsurface Profile*
    The diffusion profiles to use in the BSSDRF [#]_. This parameter can take the following values

    * Better Dipole
    * Directional Dipole :cite:`Frisvad:2014:DDM:2702692.2682629`
    * Gaussian :cite:`dEon:2007:ERH:2383847.2383869`
    * Normalized Diffusion :cite:`Christensen:2015:ARP:2775280.2792555`
    * Standard Dipole :cite:`Jensen:2001:PMS:383259.383319`, :cite:`Donner:2005:LDM:1186822.1073308`
    * Random Walk :cite:`Meng:2016:IDS:3071773.3071778`
    
*Reflectance*
    The surface reflectance.

*SSS Amount*
    A scaling factor for the overall contribution of the subsurface scattering term.

*Mean Free Path*
    Mean free path [#]_ controls how deep light can travel within the volume, scattering internally, until it's fully absorbed or exits the medium. Lower values in the limit would have a response similar to a diffuse term, while high values would allow light to travel almost unhindered, producing a translucent like appearance.

*MFP Scale*
    An overall scaling factor for the *Mean Free Path*.

SSS Advanced Parameters
"""""""""""""""""""""""

*SSS Ray Depth*
    The maximum ray depth allowed for a ray of type *subsurface*.
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