UseExtrusions

The UseExtrusions command controls whether extrusion objects or polysurfaces are created by commands like Box, Cylinder, ExtrudeCrv, Pipe, and Slab that create straight-sided objects.

Extrusion objects are defined by a profile curve and a straight line. They use less memory and mesh faster. They are a good option when making models containing lots of simple shapes.

Polysurface (left) vs. extrusion object (right).

Steps

Specify the planar extrusion output object type you want to use.

A report on the internal data structure of the object displays.

Command-line options

Extrusion

Commands uses light-weight extrusion object when possible.

Polysurface

Commands always create polysurfaces.

Commands with extrusions enabled

Commands with the button below near the top of the topic can use extrusions.

Extrusions enabled.

These commands can make use of lightweight extrusions:

Box
Cylinder
ExtrudeCrv
ExtrudeSrf
Pipe
Slab
Tube

ConvertExtrusion

The ConvertExtrusion command converts extrusion objects to surfaces and polysurfaces.

Steps

Select extrusion objects.

Command-line options

DeleteInput

Yes

Deletes the original geometry.

No

Retains the original geometry.

See also

Extrude curves and surfaces

ConvertExtrusion

Convert extrusion objects to surfaces and polysurfaces.

SelExtrusion

Select object by its object ID number.


Rhinoceros 5 © 2010-2015 Robert McNeel & Associates. 17-Sep-2015