[HN Gopher] Academy Software Foundation Announces OpenPBR, a New...
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       Academy Software Foundation Announces OpenPBR, a New Subproject of
       MaterialX
        
       Author : franzb
       Score  : 29 points
       Date   : 2023-08-02 16:54 UTC (6 hours ago)
        
 (HTM) web link (www.aswf.io)
 (TXT) w3m dump (www.aswf.io)
        
       | bhouston wrote:
       | My understanding is that this is an evolution of the Autodeks
       | Standard Surface (https://autodesk.github.io/standard-surface/),
       | which itself is a superset of the glTF 2.0 material with its PBR
       | extensions
       | (https://github.com/KhronosGroup/glTF/blob/main/extensions/RE...
       | ). This OpenPBR is designed to handle Hollywood VFX type effects
       | as well as real-time, thus it is more complex than glTF's PBR
       | materials which are real-time focused.
       | 
       | Together this means there is a lot of alignment between these
       | models. I wouldn't be surprised to see a glTF 3.0 that adopts the
       | OpenPBR as its main material definition, skipping the current
       | extension complexity.
       | 
       | OpenPBR for material exchange combined with MaterialX for shader
       | graph exchange combined (https://materialx.org) with OpenUSD for
       | geometry and scene graph exchange, means together we are headed
       | into a world where high quality 3D assets are exchangeable
       | between content creation tools.
        
         | dagmx wrote:
         | This is an evolution and merger of the Autodesk Standard
         | Surface and Adobe Standard Surface.
         | 
         | Edit: removed mention of subset/superset since his post
         | corrected the typo
         | 
         | But yes there's overlap as there will be in any PBR definition
         | and I think the glTF spec can be considered a subset of this,
         | closer to the preview variant.
        
           | bhouston wrote:
           | NOTE: I fixed the typo, it was intended to be "superset"
           | rather than "subset."
        
             | dagmx wrote:
             | Awesome. I updated my post accordingly too
        
       | dagmx wrote:
       | Since this topic may not be familiar to many on here:
       | 
       | MaterialX (https://materialx.org/ ) is a node graph based way to
       | author the surface characteristics of 3D models. It also has
       | shader code generation capabilities for GLSL(OpenGL),
       | MDL(NVIDIA), OSL(OpenShadingLanguage) and MSL(Apples Metal). It
       | was created by Industrial Light and Magic for the new Star Wars
       | trilogy and allows them to abstract the shader definition from
       | the rendering backend. E.g you have the same shader for real-time
       | and offline renderers.
       | 
       | OpenPBR is a shading model (or more accurately a BSDF
       | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4930030/ ) within
       | MaterialX. It's the successor of shading models from Autodesk and
       | Adobe who combined their work to make one consistent one.
       | 
       | MaterialX support across the industry is growing. Multiple
       | renderers support it, Blender has a PR in progress courtesy of
       | AMD, Apple use it for their shadergraph for VisionOS development
       | just to name a few.
        
       | mring33621 wrote:
       | The current headline is meaningless to someone not into computer
       | graphics/rendering.
        
         | jsheard wrote:
         | HN policy, for better or worse, is to copy the headline from
         | the article exactly. In my experience any tweaks to the title
         | just get reverted by the mods.
        
         | franzb wrote:
         | That's fair, but so are many headlines to people not intimately
         | involved with the corresponding projects or tech stacks :)
        
         | kunwon1 wrote:
         | I clicked on this after my brain told me that PBR stands for
         | policy-based routing
        
           | itronitron wrote:
           | I had a hunch it was not going to be about Pabst Blue Ribbon,
           | but I clicked the link anyway.
        
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       (page generated 2023-08-02 23:01 UTC)