Start

Offset of the extrusion from the beginning (U = 0) of the curve, as a percentage of the curve length.

End

Offset of the extrusion from the end of the curve, as a percentage of the curve length.

Duplicate Polygons

Controls how polygons are copied.

• If this option is off, polygons are extruded, that is, the copied polygons are connected to the original geometry.

• If this option is on, polygons are duplicated, that is, the copied polygons are disconnected from the original geometry.

This option applies only to polygons, not to edges or points.

Inset Amount

Shrinks the boundary of the new polygons by the specified amount in Softimage units. Negative values expand the boundary instead of shrinking it, and the resulting polygons will not overlap even when the extrusion length is 0.

You can achieve similar effects by scaling using the options on the Transform tab, but with insetting the new edges are always parallel to the originals. In addition, scaling does not always work well with concave polygons whose edges might self-intersect. Another difference is that the inset always applies to the entire extrusion, rather than being repeated per subdivision.

This option applies only to polygons, not to edges or points.

Autorotate

Rotates the curve of extrusion so that its endpoint is aligned with the selected components.

Perpendicular

Rotates the extruded components so that they are perpendicular to the curve of extrusion at each subdivision. This option is most useful when extruding polygons and edges; when extruding points, you’ll probably want this off.

Merge

When on, adjacent polygons are extruded together as a unit. When off, adjacent polygons are extruded separately, separated by polygons.

Skirting Ratio

When extruding edges and points, controls the width at the base. Lower values produce sharper spikes and creases. With multiple Subdivs, this parameter controls the curvature of the extrusion profile.

Subdivs

Number of subdivisions generated along the curve of extrusion. This parameter is affected by the Per Knot option.

Per Knot

When on, the specified number of Subdivs are generated for every knot segment in the curve of extrusion. When off, the specified number of Subdivs are generated for the entire curve.

Transform Per Subdivision

Repeats the transformations iteratively at each subdivision. This option has an effect only when Subdivs on the Extrude page is greater than 1. When off, the transformation is applied to the extrusion as a whole.