This section describes NURBS curve and surface related modeling
tools, which you can find in the "Tools"
menu of the main window.
A Closed B-Spline
A NURBS Circle
Left: original curve, Right: resulting split curves for t=0.5
Successive Application of Elevate Tool (Order 3 (left), 4 (middle), 5 (right))
Successive Application of Refine Tool
Left: original curve, Right: clamped curve
Left: original curve, Right: a knot has been inserted 1 time at t=0.5
Curvature Plot (top) of simple NURBS curve (bottom)
Closed B-Spline curve (right), shifted version (left)
"CreateMP"
option of the curve or patch object is activated). You should immediately
edit the control points after exploding to avoid that they automatically
collapse to a multiple point again!
GUI of Tesselation Tool
The selected or provided NURBS patches will be tesselated with the chosen method and parameters. The PolyMesh objects created by the tesselation will immediately be displayed in all view windows instead of the original objects. Whenever tesselation method or parameters change the tesselation will be recomputed and displayed thus allowing an immediate estimation of the tesselation quality.
If the preference option "Modeling/LazyNotify"
is enabled,
updates of the tesselation that normally occur while dragging the
slider(s) will be deferred until the mouse button is released.
If the "Ok"
button is pressed to close the tesselation tool, all
selected objects will be replaced by their tesselated
counterparts; if "Cancel"
is used, all selected objects remain
unchanged.
If the check box "SaveToTag"
is activated, closing the tesselation
tool using "Cancel"
will also add a "TP"
tag containing
the currently selected method and parameter value to all selected
NURBS patch objects. This tag will be evaluated later, when the respective
objects will be converted to PolyMesh objects.
<Tab>
key.See section Miscellaneous Preferences for a more extensive discussion of the tesselation methods and their parameter(s).