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SubD Edit Tools > Extrude Faces and Boundary Edges 
The ExtrudeSubD command extrudes SubD faces and boundary edges with different direction modes.
Start the command.
Select SubD faces or boundary edges to extrude.
To extrude a whole SubD, select the SubD before starting the command.
Set commandline options.
Pick or enter the extrusion distance.
Commandline options
Pick an edge on the boundary to select an edge loop.
All faces or boundary edges extrude in the same direction based on world coordinates.
The direction is picked freely.
The direction is fixed to the world X, Y, or Z axis.
Each face or edge extrudes in the direction based on UVN coordinates.
The direction is picked freely.
Boundary edges extrude along the extending direction of the faces.
Faces extrude along vertex normal directions.
Boundary edges extrude perpendicular to the faces.
Picks a point as the starting point of the extruding distance.
Extrudes mesh faces and boundary edges with different direction modes.
Drive surface edges in a straight line to create a solid.
Drive closed planar curves in a straight line.
Rhinoceros 8 © 20102024 Robert McNeel & Associates. 16May2024