Output Root
Placeholder: content browser path where all binding assets and origin meshes are saved. The tool creates the per-character and per-type subfolders automatically. Default: /Game/MetaHumans/Optimized/GroomBindings.
Binding Mode
Placeholder: the three options and what each one does internally.
| Mode | Source mesh used for projection |
|---|---|
| Target only | Placeholder: no source mesh. The engine projects groom strand roots directly onto the target mesh. Use when the mesh has no positional offset. |
| Custom source | Placeholder: a specific mesh you provide. Used as SourceSkeletalMeshForTransfer for every binding in the batch. Origin mesh creation is skipped. |
| Auto offset | Placeholder: an auto-generated origin mesh. The tool duplicates each target mesh and applies the inverse of your X/Y/Z offset to its vertices. Requires the offset fields to be filled in. |
Matching Section
Placeholder: the material element index (0-based) of the face skin geometry on your target mesh. This tells the binding builder which part of the mesh to use for projection. Open the mesh in the Skeletal Mesh Editor and check the LOD 0 material list — the face skin slot is usually index 0. Defaults to 0.
RBF Quality
Placeholder: the number of RBF interpolation points used when computing the binding (0 to 100). Higher values produce more accurate strand root placement but take longer to compute. 100 is the default and recommended for final bindings. Lower values can be used for quick tests.
LOD Settings
Placeholder: two LOD parameters:
- Source Mesh LOD: which LOD of the source (or target in Target Only mode) mesh is used for barycentric projection. LOD 0 (highest vertex count) gives the most accurate results. Defaults to 0.
- Target Mesh Min LOD: minimum LOD level this binding applies to at runtime. 0 means the binding is used across all LODs. Defaults to 0.
Overwrite Existing
Placeholder: when enabled, any existing binding asset at the output path is deleted and recreated. When disabled (default), existing bindings are skipped. Useful for updating a subset of bindings without regenerating the full batch.
Positional Offset (Auto Offset Mode Only)
Placeholder: three float fields (X, Y, Z) representing the translation applied to your face mesh vertices relative to the original groom-authoring space. The tool applies the inverse of these values to the auto-generated origin mesh. All target meshes in a single run share the same offset. Defaults to 0, 0, 0.
Placeholder: note that these fields are only relevant when binding mode is set to Auto Offset. They have no effect in Target Only or Custom Source mode.
Full Settings Reference
| Field | Default | Description |
|---|---|---|
| Output Root | /Game/MetaHumans/Optimized/GroomBindings |
Base content folder for all bindings and origin meshes |
| Binding Mode | Target Only | Target Only, Custom Source, or Auto Offset |
| Matching Section | 0 | Material slot index of face skin on the target mesh |
| RBF Quality | 100 | Interpolation quality (0-100) |
| Source Mesh LOD | 0 | LOD used for barycentric projection |
| Target Mesh Min LOD | 0 | Minimum runtime LOD this binding covers |
| Overwrite Existing | Off | Re-create existing bindings vs. skip them |
| Offset X / Y / Z | 0, 0, 0 | Positional offset for Auto Offset mode only |