HAT

Haven Asset Tester - A Blender add-on we use for texture and model QC

How to install:

Add the following URL as a new Remote Repository extension in Blender:

https://raw.githubusercontent.com/Poly-Haven/HAT/main/index.json

Search for the HAT extension and click Install.

Features:

Checks:

Asset Structure

• Model collection name should match the asset slug
• Texture datablock names should match their file names
• Geometry nodes collections are properly structured with LOD0 or static collections
• LOD (Level of Detail) collections and objects are properly structured
• No world or HDRI data blocks should be present in the asset
• File should contain only one scene and one view layer
• Texture assets should only have "Plane" and "Sphere" objects
• No orphaned data blocks (unused data) should be present

Files

• File size is within acceptable limits for the asset type
• All referenced texture files exist on disk
• All texture paths should be relative and point to the textures folder

Geometry

• All objects have applied scale (1.0) to ensure no unexpected behaviour
• Objects should be at the origin
• Objects should not have shape keys which may cause issues for GLTF export
• Scene unit scale is set to 1.0 meters and is Metric
• Objects should not have vertex colors which may break GLTF export

Materials

• Material IOR (Index of Refraction) values are within expected range
• Material names should match the asset slug
• Materials should not contain math nodes, which mess with exporters
• Materials should not contain mix nodes
• No unused nodes in materials
• Image node labels (if set) should match map names
• Materials should have exactly one output node
• Only Principled BSDF shaders should be used
• SSS may have been accidentally enabled
• All textures should use UVs for mapping

Naming

• Asset slug follows proper naming conventions (lowercase, allowed characters only)

Technical

• Blender version is the latest official release

Textures

• Texture map names follow standardized naming conventions
• Texture maps use appropriate color space settings (Non-Color Data when required)
• No texture files should be packed into the blend file
• Texture preview plane has non-default dimensions
• Texture file names should start with the asset slug and follow naming conventions

To do:

• Main collection is visible and renderable

Tools:

• Test FBX export
• Export GLTF
• Clean file of unused datablocks, including fake-user ones
• Make image datablock names match their file names
• Open folder containing Blend file
• Make mesh datablock name match object name

Misc:

• Pre-save handler to set viewport shading solid