Surface
- A surface is a kind of geometry. RapidFrom
provides NURBS(Non-uniform Rational B-Spline) surface as the surface
geometry, which can be generated by user's definition of its boundary curve.
Control point
can reside in the bi-direction, U-direction and V-direction.
The U-direction is determined based on the order of user's selection. That
is, the direction of a curve that is picked first is defined as the
U-direction.
- The surface is divided into 2 types, untrimmed
and trimmed surface. The untrimmed surface has 4 boundary curves, while the
trimmed surface has 2, 3, or more than 4 boundary curves. The trimmed
surface is a special type of surface which is trimmed with its boundary
curves after a 4-boundary surface surrounding all the user's selection
curves is generated.
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