3 ms·

Academy Software Foundation Announces OpenPBR, a New Subproject of MaterialX

36 points by franzb 3y ago

bhouston 3y ago
My understanding is that this is an evolution of the Autodeks Standard Surface (https://autodesk.github.io/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/README.md 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 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 3y ago
  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 3y ago
    NOTE: I fixed the typo, it was intended to be "superset" rather than "subset."
    - dagmx 3y ago
      Awesome. I updated my post accordingly too
mring33621 3y ago
The current headline is meaningless to someone not into computer graphics/rendering.
- franzb 3y ago
  That's fair, but so are many headlines to people not intimately involved with the corresponding projects or tech stacks :)
- jsheard 3y ago
  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.
- kunwon1 3y ago
  I clicked on this after my brain told me that PBR stands for policy-based routing
  - itronitron 3y ago
    I had a hunch it was not going to be about Pabst Blue Ribbon, but I clicked the link anyway.
dagmx 3y ago
Since this topic may not be familiar to many on here: MaterialX (https://materialx.org/ 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/ 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.

36 points by franzb 3y ago

My understanding is that this is an evolution of the Autodeks Standard Surface (https://autodesk.github.io/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/README.md 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 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 3y ago
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 3y ago
  NOTE: I fixed the typo, it was intended to be "superset" rather than "subset."
  - dagmx 3y ago
    Awesome. I updated my post accordingly too

mring33621 3y ago

The current headline is meaningless to someone not into computer graphics/rendering.

franzb 3y ago
That's fair, but so are many headlines to people not intimately involved with the corresponding projects or tech stacks :)
jsheard 3y ago
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.
kunwon1 3y ago
I clicked on this after my brain told me that PBR stands for policy-based routing
- itronitron 3y ago
  I had a hunch it was not going to be about Pabst Blue Ribbon, but I clicked the link anyway.

dagmx 3y ago

Since this topic may not be familiar to many on here: MaterialX (https://materialx.org/ 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/ 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.