> [!abstract] Summary > Extract a **curve from selected edges** of a mesh — useful for road generation, scattering on edges, edge flow control, or generating splines for downstream procedural workflows. --- # Workflow 1. **Select** the edges you want to transform into a curve. 2. Use **Edge Group → Group from Edges**, then **Convert Line** to turn the edges into a polyline. 3. (Optional) **Resample** the curve to control point density. 4. (Optional) **PolyPath** to convert the line into a continuous curve / spline. ![[file-20241009195011816.png]] --- # Common Uses - **Roads / paths** — extract the centreline of a road mesh. - **Curve from silhouette** — pull a curve from the outline of geometry. - **Edge scatter** — scatter points along the resulting curve with [[Houdini Scatter on curve|Scatter on Curve]]. - **Wires / cables** — generate cable curves from edges in a CAD-style import. --- # 🔗 Related - [[Houdini Scatter on curve|Scatter on Curve]] — what to do with the curve next. - [[HOUDINI Scatter|HOUDINI Scatter]]. - [[Houdini Group by Range|Group by Range]] — pre-filter edges.