> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# WeldVertices - ComfyUI Built-in Node Documentation

> Weld Vertices merges coincident vertices in a 3D mesh, so faces that previously had separate corner points end up sharing the same vertices.

Weld Vertices merges coincident vertices in a 3D mesh, so faces that previously had separate corner points end up sharing the same vertices. It groups nearby vertices using grid quantization with a tolerance based on the mesh bounding box, and averages vertex colors for each merged group. This is useful when a mesh arrives unwelded, meaning each face has its own vertices and no shared edges.

## Inputs

| Parameter     | Description                                                                                                                 | Data Type | Required | Range            |
| ------------- | --------------------------------------------------------------------------------------------------------------------------- | --------- | -------- | ---------------- |
| `mesh`        | The input 3D mesh whose coincident vertices will be merged.                                                                 | MESH      | Yes      | -                |
| `epsilon_rel` | Weld tolerance (fraction of bbox diagonal). 1e-5 for float dedup; 1e-3 for visibly-close-but-distinct verts. Default: 1e-5. | FLOAT     | Yes      | 0.0 to unlimited |
| `epsilon_abs` | Absolute weld tolerance (overrides epsilon\_rel when > 0). Default: 0.0.                                                    | FLOAT     | Yes      | 0.0 to unlimited |

Note: When `epsilon_abs` is greater than 0, it takes precedence over `epsilon_rel` and the relative tolerance is ignored. When `epsilon_abs` is 0, the relative tolerance `epsilon_rel` is used.

## Outputs

| Output Name | Description                                                                                                            | Data Type |
| ----------- | ---------------------------------------------------------------------------------------------------------------------- | --------- |
| `mesh`      | The welded mesh with merged vertices, updated face indices, and averaged vertex colors (if the input mesh had colors). | MESH      |

> This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/WeldVertices/en.md)

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