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Shader API | Substance 3D Painter

  1. Substance 3D home
  2. Home
  3. Getting Started
    1. Getting Started overview
    2. Activation and licenses
    3. System requirements
    4. Project creation
    5. Export
      1. Export overview
      2. Export window
        1. Export window overview
        2. Export settings
        3. Output templates
        4. List of exports
      3. Export presets
        1. Export presets overview
        2. Predefined presets
          1. Predefined Presets
          2. USD PBR Metal Roughness Preset
          3. Default Presets
        3. Creating export presets
    6. Glossary
    7. Performance
  4. Interface
    1. Assets
      1. Assets overview
      2. Navigation
      3. Customizing the layout
      4. Filter by path
      5. Saved searches
      6. Advanced search queries
      7. Adding a new library
      8. Sub-library tab
    2. Substance 3D Assets
    3. Color picker
    4. Display settings
      1. Display settings overview
      2. Environment settings
      3. Camera settings
      4. Viewport settings
    5. History
    6. Layer stack
      1. Layer stack overview
      2. Creating layers
      3. Managing layers
      4. Masking and effects
      5. Blending modes
      6. Layer instancing
      7. Geometry mask
    7. Main menu
      1. Main menu overview
      2. File menu
      3. Edit menu
      4. Mode menu
      5. Window menu
      6. Viewport menu
      7. Plugins menu
      8. Help menu
    8. Project configuration
    9. Properties
    10. Settings
      1. Settings overview
      2. General preferences
      3. Shortcuts
      4. Libraries configuration
    11. Shader settings
      1. Shader settings overview
      2. Updating a shader
    12. Texture Set
      1. Texture Set overview
      2. Texture Set list
      3. Texture Set settings
      4. Texture Set reassignment
    13. Toolbars
    14. Viewport
      1. Viewport overview
      2. 2D view
      3. 3D view
      4. Camera management
    15. Miscellaneous
      1. Sliders
      2. Log
      3. Update checker
  5. Painting
    1. Painting overview
    2. Tool list
      1. Paint brush
      2. Eraser
      3. Projection
      4. Polygon fill
      5. Smudge tool
      6. Clone Tool
      7. Quick mask
      8. Path tool
    3. Straight line   
    4. Lazy mouse 
    5. Symmetry
      1. Symmetry overview
      2. Mirror Symmetry
    6. Fill projections
      1. Fill projections overview
      2. Fill (match per UV Tile)
      3. UV projection
      4. Tri-planar projection
      5. Planar projection
      6. Spherical projection
      7. Cylindrical projection
      8. Warp projection
      9. UV set to UV set projection
    7. Presets
      1. Presets overview
      2. Creating and saving presets
      3. Creating particles presets
        1. Creating particles overview
        2. Installing the particle editor
        3. Overview of the particle editor
        4. Creating a new particle script
      4. Photoshop brush presets (ABR)
        1. Photoshop brush presets overview
        2. Exporting Brush Presets from Photoshop
        3. Importing Photoshop Brush Presets
        4. Photoshop Brush Parameters Compatibility
    8. Dynamic strokes
      1. Dynamic strokes overview
      2. Enabling Dynamic Stroke feature
      3. Dynamic Stroke Performances
      4. Creating custom Dynamic Strokes
    9. Advanced channel painting
      1. Channel painting overview
      2. Ambient Occlusion
      3. Flow Map
      4. Height Map
      5. Normal Map
    10. Vector graphic (.svg & .ai)
    11. Text resource
  6. Effects
    1. Effects overview
    2. Generator
    3. Paint
    4. Fill
    5. Levels
    6. Compare Mask
    7. Filter
    8. Anchor Point
  7. Baking
    1. Baking overview
    2. How to bake mesh maps
    3. Baking visualization settings
  8. Content
    1. Creating custom effects
      1. Creating custom effects overview
      2. Generic filter
      3. Channel specific filter
      4. Generators
      5. Mesh map
      6. Mesh based input
      7. User data
    2. Importing assets
      1. Adding resources via drag and drop
      2. Adding resources via the import window
      3. Adding content on the hard drive
      4. Receiving assets from other Substance 3D applications
  9. Features
    1. Automatic UV Unwrapping
    2. Physical size
    3. Smart Materials and Masks
    4. Subsurface Scattering
      1. Subsurface Scattering overview
      2. Enabling Subsurface in a Project
      3. Subsurface Parameters
      4. Subsurface Material Type
    5. Dynamic Material Layering
    6. UV Reprojection
    7. UV Tiles
      1. UV Tiles overview
      2. Image Sequence
    8. Color Management
      1. Color management overview
      2. Color management with Adobe ACE - ICC
      3. Color management with OpenColorIO
    9. Post Processing
      1. Post Processing overview
      2. Color correction
      3. Depth of Field
      4. Glare
      5. Lens Distortion
      6. Tone Mapping
      7. Vignette
      8. Color Profile
    10. Iray Renderer
      1. Iray Renderer overview
      2. Iray Settings
      3. Viewer and MDL Settings
    11. Plugins
      1. Plugins overview
      2. Autosave
      3. Resources Updater
    12. Sparse Virtual Textures
    13. Custom Shaders
    14. SpaceMouse® by 3Dconnexion
    15. Universal Scene Description (USD)
    16. Send to
  10. Technical Support
    1. Performance Guidelines
      1. Performances guidelines overview
      2. Conflicts and background applications
      3. Mesh and UV setup
      4. GPU Drivers
      5. NVIDIA Drivers Settings
      6. GPU VRAM amount and bandwidth
      7. GPU VRAM and other applications
      8. Texture Sets amount
      9. Layer management
      10. Channels management
      11. Substance filters and materials
      12. Viewport display
    2. Configuring Pens and Tablets
    3. Exporting the log file
    4. Exporting a DXDiag
    5. Technical issues
      1. GPU Issues
        1. Crash when working with overclocked GPU
        2. Forcing the external GPU on Mac OS
        3. GPU drivers compatibility
        4. GPU drivers crash with long computations (TDR crash)
        5. GPU has outdated drivers
        6. GPU is not recognized
        7. GPU is not recognized and is mentionned as GDI Generic
        8. Issues with Nvidia GPUs on recent Mac OS versions
        9. Multi/Bi-GPU
        10. Running on integrated GPU
        11. Painter doesn't start on the right GPU
      2. Startup Issues
        1. Application failed to start because of Qt
        2. Crash or freeze during startup
        3. Software conflicts
      3. Rendering Issues
        1. Artifacts and glitches on Mac OS with Custom GPUs
        2. Blocky artifacts appear on textures in the viewport
        3. Mesh appears pink in the viewport
        4. Mesh flash to white when moving camera
        5. Some HDPI scaling values are not working
      4. Stability Issues
        1. Crash during export
        2. Crash when opening or saving a file
        3. Crash while baking
        4. Crash with low virtual memory
        5. Windows Blue Screens
      5. Miscellaneous Issues
        1. Corrupted texture error message
        2. Shelf resources are gone after 7.2 update
        3. Error there is no disk in the drive
        4. Error with missing api-ms-crt dll
        5. Impossible to drag and drop files into the shelf
        6. Impossible to use the ALT keyboard shortcut on Linux
        7. Assets (or shelf) previews are empty
    6. Workflow Issues
      1. Export Issues
        1. My exported opacity map is totally black
        2. Texture dilation or Padding
      2. Tools Issues
        1. Normal map looks incorrect when loaded in layer or tool properties
        2. Paint Tool bleeds on other UV islands
      3. Project Issues
        1. A project has been processed as a text file and is now corrupted
        2. Loading files from a network
        3. Preserve brush strokes setting stays disabled
        4. Projects are really big
      4. Library Issues
        1. Thumbnails in the shelf look incorrect
        2. Error when importing a Font
      5. Viewport Issues
        1. Mesh faces disappear when looking at them from behind
        2. Viewports and textures are blurry or lack sharpness
      6. Plugins Issues
        1. Substance Source plugin doesn't load
      7. License Issues
        1. Maintenance is expired dialog on startup
  11. Pipeline and integration
    1. Installation and preferences
      1. Preferences and application data location
      2. Automated installation
      3. Retrieving the installation path
    2. Configuration
      1. Command lines
      2. Environment variables
      3. Firewall Configuration
      4. Querying Current Software Version
      5. Remote Desktop
    3. Resource management
      1. Shelf and Assets location
      2. Resource paths
        1. Adding resource paths by editing preferences manually
        2. Editing resource paths manually
        3. Editing the Shelf Preferences with Python
      3. Adding saved searches manually
      4. Preferences and content migration
      5. Excluding resources in a resource path
  12. Scripting and development
    1. Scripts and plugins
      1. Creating a Javascript plugin
      2. Remote control with scripting
    2. Shader API Reference
      1. Shader API overview
      2. Changelog - Shader API
      3. Libraries - Shader API
        1. Lib Alpha - Shader API
        2. Lib Bayer - Shader API
        3. Lib Defines - Shader API
        4. Lib Emissive - Shader API
        5. Lib Env - Shader API
        6. Lib Normal - Shader API
        7. Lib PBR - Shader API
        8. Lib PBR Aniso - Shader API
        9. Lib Pom - Shader API
        10. Lib Random - Shader API
        11. Lib Sampler - Shader API
        12. Lib Sparse - Shader API
        13. Lib SSS - Shader API
        14. Lib Utils - Shader API
        15. Lib Vectors - Shader API
      4. Parameters - Shader API
        1. All Custom Params - Shader API
        2. All Engine Params - Shader API
        3. All Rendering States Params - Shader API
        4. Layering Bind Materials - Shader API
        5. Layering Declare Stacks - Shader API
      5. Shaders - Shader API
        1. PBR Material Layering - Shader API
        2. PBR Metal Rough - Shader API
        3. Pixelated - Shader API
        4. Surface Shader - Shader API
        5. Toon - Shader API
  13. Release notes
    1. Release notes overview
    2. All Changes
    3. Version 10.1
    4. Version 10.0
    5. Version 9.1
    6. Old versions
      1. Version 9.0
      2. Version 8.3
      3. Version 8.2
      4. Version 8.1
      5. Version 7.4
      6. Version 7.3
      7. Version 7.2
      8. Version 2021.1 (7.1.0)
      9. Version 2020.2 (6.2.0)
      10. Version 2020.1 (6.1.0)
      11. Version 2019.3
      12. Version 2019.2
      13. Version 2019.1
      14. Version 2018.3
      15. Version 2018.2
      16. Version 2018.1
      17. Version 2017.4
      18. Version 2017.3
      19. Version 2017.2
      20. Version 2017.1
      21. Version 2.6
      22. Version 2.5
      23. Version 2.4
      24. Version 2.3
      25. Version 2.2

Shader API

Substance Painter uses shaders to render materials in its realtime viewport. It is possible to write custom shaders to implement new behaviors or to simply make the viewport match other renderers.

Additional shaders for Substance Painter can be found on Substance Share.

Note:

The Shader API is also available directly from the application, by going into the menu Help > Documentation > Shader API.

Shader reference

Changelog

Warm up

In Substance Painter, you can write your own shaders in GLSL. We allow you to write only a portion of the fragment shader, which is sometimes called a surface shader. Without further ado, let's introduce the "Hello world" Substance Painter surface shader:

void shade(V2F inputs) { 
  diffuseShadingOutput(vec3(1.0, 0.0, 1.0)); 
}

Now, if you save this snippet into a .glsl file and load it into Substance Painter by dropping it into your shelf's shader tab, you can now use it and see a beautiful uniform pink color on your mesh.

Surface shader

Engine provided data (or how do I access my channels?)

In Substance Painter, you can access rendering engine parameters (document's channels, additional textures, camera-related data and the like). Here is an exhaustive list of all engine provided parameters :

Engine settings (or how do I specify rendering states?)

In some cases you may want to use a specific rendering configuration (culling, blending, sampling locality, and the like) for an effect. Some rendering states are exposed and can be set in the shader. Here is an exhaustive list of all exposed rendering states :

Custom tweaks (or how do I tweak my shader?)

It's usual to have custom tweaks in a shader. To do so in Substance Painter's shaders, we have introduced a way to specify custom tweaks. Here is an exhaustive list of all custom shader tweaks types :

Embedded libraries

In order to avoid writing a lot of boilerplate code in all of your shaders, we created a small yet practical library of useful functions. Please note that you can't edit it nor create your own at the moment.

Metadata

You can declare additional non required information to give some hint to the rendering system. Here is the syntax:

//: metadata { 
//:   "key1":"value1", 
//:   "key2":"value2" 
//: }

Supported keys are:

  • custom-ui: Replace the standard shader parameters user interface with a custom view written as a QML module (see scripting documentation). The path can be absolute or relative to one of your shelf custom-ui folder.
  • mdl: define the Iray mdl material to use with the shader. The path syntax is as follow: mdl::folder1::folder2::mdl_filename::material_name where folder1::folder2::mdl_filename is the path inside one of your shelf mdl folder to a mdl file and ::material_name is the name of a material declared inside this mdl file. (ex: "mdl" : "mdl::alg::materials::physically_metallic_roughness::physically_metallic_roughness")

Example shaders (yeah, finally!)

To get a taste of what looks like a real shader, here are a few sample shader, ordered by increasing complexity:

Dynamic material layering

The Dynamic Material Layering is a specific workflow where materials are mixed together inside a shader and let the user dynamically edit blending masks in Substance Painter. To enable this workflow, there are two new functionalities:

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