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Extend Surface command

Surface extend

Posted Image Extends a surface along one or more edges you select.

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The edges you select can form a continuous chain (1) or be interrupted (2).
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The extend options which are available depend on whether the surface is an analytic surface or a non-analytic surface. Examples of analytic surfaces include planes, partial cylinders, cones, spheres, and tori. You create non-analytic surfaces when you sweep or extrude a b-spline curve, or when you construct lofted, swept or BlueSurf feature using b-spline curves.

When extending a non-analytic surface, you can specify whether the extension is Natural, Linear, or Reflective along certain types of edges. For example, when extending an extruded surface constructed using a b-spline curve, you can specify the Natural Extend, Linear Extend, or Reflective Extend options for the two edges which are parallel to the input b-spline curve (1, 2).

For the two edges which are perpendicular to the input b-spline curve (3, 4), only the Natural Extend option is mathematically possible. In this example, the natural extension is linear.

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Additional examples are illustrated in the Extend Surface command bar topic.

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