Polysurfaces and extrusion objects

A polysurface consists of two or more surfaces that are joined together. A polysurface that encloses a volume of space defines a solid.

Solids are created anytime a surface or polysurface is completely closed.

Some Rhino commands create polysurface solids. Pyramid, Cone, and TruncatedCone are examples of commands that create polysurface solids.

Lightweight extrusion objects

The Box, Cylinder, Tube, ExtrudeCrv, and ExtrudeSrf commands can create polysurface or extrusion objects. Polysurfaces can be closed with a planar cap or open.

Note

Commands affected

UseExtrusions

Specify whether extrusion objects or polysurfaces are used when extruding straight‑sided objects.

The UseExtrusions command controls the use of extrusion objects.

ConvertExtrusion

Convert extrusion objects to surfaces and polysurfaces.

SelPolysrf

Select all polysurfaces.

SelClosedPolysrf

Select all closed polysurfaces.

SelOpenPolysrf

Select all open polysurfaces.

Explode

Break objects down into components.

ConvertExtrusion

Convert extrusion objects to surfaces and polysurfaces.

Draw polysurfaces

When UseExtrusions is turned off, these commands will create surface and polysurface objects.

Boss

Extrude closed planar curves normal to the curve plane toward a boundary surface where the boundary surface is trimmed and joined to the extruded objects.

Box

Draw a solid box.

Cone

Draw a cone.

Cylinder

Draw a cylinder.

Fin

Extrude a curve on a surface in the surface normal direction.

Pipe

Create a surface, polysurface, or extrusion object with a circular profile around a curve.

Pyramid

Draw a pyramid.

Rib

Extrude a curve in two directions to a boundary surface.

Ribbon

Offset a curve and create a ruled surface between the curves.

Slab

Offset a polyline, and extrude and cap the result to create a solid.

TruncatedCone

Draw a cone whose apex is truncated by a plane.

TruncatedPyramid

Draw a pyramid whose apex is truncated by a plane.

Extrude curves into polysurfaces

When UseExtrusions is turned off, these commands will create surface and polysurface objects.

ExtrudeCrv

Drive closed planar curves in a straight line.

ExtrudeCrvAlongCrv

Drive closed planar curves along a path curve.

ExtrudeCrvTapered

Drive closed planar curves in a straight line tapering at an angle.

ExtrudeCrvToPoint

Drive closed planar curves tapering to a point.

Extrude surfaces into polysurfaces

When UseExtrusions is turned off, these commands will create surface and polysurface objects.

ExtrudeSrf

Drive surface edges in a straight line to create a solid.

ExtrudeSrfAlongCrv

Drive surface edges along a path curve to create a solid.

ExtrudeSrfTapered

Drive surface edges in a straight line tapering at an angle to create a solid.

ExtrudeSrfToPoint

Drive surface edges tapering to a point to create a solid.

See also

Extrude curves and surfaces

 

 

 

Rhinoceros 6 © 2010-2019 Robert McNeel & Associates. 16-May-2019