Extrude Curve Modifier is a Geometry Nodes-based tool that adds procedural 3D extrusion to paths without converting them to mesh objects. The modifier provides controls for defining extrusion height, setting segment divisions, and toggling top and bottom caps. It automatically handles mesh normal orientation to ensure consistent output.

The tool supports both Bézier and NURBS curve types, and can correctly process multiple splines within a single object to create hollow shapes. This continuous non-destructive workflow allows users to adjust underlying paths at any point during modeling. It is particularly useful for extruding imported vector graphics, architectural floor plans, and CAD data without the limitations of destructively converting curves to meshes beforehand.