> ## 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 Nodes from Open Mesh

Extract all vertices lying on free edges (edges shared by exactly one face) of an open surface mesh as a list of Points. Returns an empty list for closed (watertight) meshes.

### Inputs

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

### Outputs

| Type                                                      |
| --------------------------------------------------------- |
| [Point List](../../../../block-documentation/types/point) |