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Convert face into b-spline
Menu access: Shape | Toolbox | Convert face into b-spline
Description:
Allows to convert a surface into a b-spline surface.
Once converted, the shape is basified (its associativity is broken).
General philosophy :
Select the face to convert.
Choose the conversion mode: "parameter" or "tolerance".
Give the number of points according to U and V or the tolerance to use.
Validate with OK .
Available option(s):
The option Mode
= PARAMETER or
TOLERANCE
Allows
you to choose how the surface will be rebuilt:
PARAMETER : you must give the number of control points according to the U and V axis of the surface. Then the surface is rebuilt by creating isoparametric curves according to the number of points given.
The more the number of point is high, the more the b-spline surface will be in accordance with the initial surface.
TOLERANCE : The surface is converted with the given tolerance. The more the tolerance is low, the more the b-spline surface will be in accordance with the initial surface.
When the surface to convert is already
a b-spline surface, the option Synchronization
= UNIFORM or
PARAMETRIZATION
allows
you to define the way the control points will be distributed along the
U and V axis. 
Specific point(s):
This function can also be useful
if you need a different distribution of the control points on the surface
than the actual one (for example because isoparametric curves had been
previously added on an area of the surface in order to modify it locally).
