Curvature Combs
Curvature combs provide visual enhancement of the slope and curvature
of most sketch entities in part, assembly, and drawing documents.
To show the curvature combs
of a sketch entity:
In
an open sketch, right-click a sketch entity and select Show
Curvature Combs.
A comb appears
that displays the curvature of the entity.
For splines,
the comb crosses the spline at inflection points.
The comb changes
shape dynamically as you drag the sketch entity and its curvature changes.
In
the Curvature
Scale PropertyManager, move the sliders to adjust the size
and density of the curvature comb.
Click
OK 
.
The comb remains visible when you close the
sketch (unless the sketch is made into a feature).
To change the scale and density
of all curvature combs in a sketch:
In an open sketch, right-click a sketch entity
with curvature combs displayed and select Modify
Curvature Scale.
To hide the curvature comb of
a sketch entity:
In an open sketch, right-click
the sketch entity and select Show Curvature
Combs.