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

# Boundary Polycurves from Open Mesh

Chain the free edges of an open surface mesh into ordered boundary loops and return each loop as a Polycurve. Returns an empty list for closed (watertight) meshes.

### Inputs

| Name | Type                                               | Description                                       |
| ---- | -------------------------------------------------- | ------------------------------------------------- |
| Mesh | [Mesh](../../../../block-documentation/types/mesh) | Open surface mesh to extract boundary loops from. |

### Outputs

| Type                                                              |
| ----------------------------------------------------------------- |
| [Polycurve List](../../../../block-documentation/types/polycurve) |