Graphics Programs Reference
In-Depth Information
Note
If the SURFACEASSOCIATIVITY variable is 1 , by modifying linear objects, the
surface immediately adjusts.
In the selection sets we can include surfaces and solids edges.
Creating surfaces from other surfaces
Several commands are presented that allow you to create surfaces from existing sur-
faces. Bulge and continuity are two options frequently used when creating or adjust-
ing surfaces.
Continuity and bulge
The two important surface properties are continuity and bulge. These properties can
be controlled when creating the surface (with options or grips) or later, with grips or
the PROPERTIES palette.
Continuity defines the transition between surfaces and AutoCAD allows three pos-
sibilities:
G0 : This is just position, coincident edges between the two surfaces, with
crease
G1 : This is position and tangency; there is a smooth transition (no crease)
between surfaces but can have sudden changes in curvature
G2 : This is position, tangency, and curvature; the two surfaces share the
same curvature or a similar radius at the transition
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