This section describes NURBS curve and surface related modelling
tools, which you can find in the "Tools"
menu of the main window.
A Closed B-Spline
A NURBS Circle
"Custom"
, it will be converted to "NURB"
, otherwise the
knot type of the new curve will be that of the first selected curve.
Due to those changes of the knot values, the resulting curve might
differ from the original curves.
See also section
ConcatNC Object.
The original NURBS curves will not be deleted by this tool.
Split Tool (left: original curve, right: resulting split curves for t=0.5)
Trim Tool (left: original curve, right: resulting trimmed curve for umin=0.1, umax=0.5)
Successive Application of Elevate Tool (Order 3 (left), 4 (middle), 5 (right))
Successive Application of Refine Tool
Successive Application of Coarsen Tool
Clamp Tool (left: original curve, right: clamped curve)
"Custom"
.
The point selection will be removed from the original objects.
Left: original curve, Right: a knot has been inserted 1 time at t=0.5
"Custom"
.
The point selection will be removed from the original objects.
Remove Knot Tool (left: original curve, right: the knot at t=0.5 has been removed 1 time)
Curvature Plot (top) of simple NURBS curve (bottom)
Shift Closed B-Spline Tool (left: Closed B-Spline Curve, right: Shifted Curve)
To XY Tool (left: original curve, right: modified curve)
Make Compatible Tool (left: Original Curves, right: Compatible Curves)
"Custom"
!
This tool does not change the geometry of the curves.
"Custom"
!
This tool does not change the geometry of the curves.
"CreateMP"
option of the curve or patch object is activated). You should immediately
edit the control points (move them apart) after exploding to avoid that
they automatically collapse to a multiple point again!
"Custom"
. New control points will be added and the position
of old control points may be changed in the progress.
The point selection will be removed from the original object.
Patch Clamp Tool (left: Original Patch with B-Spline Knot Vectors, right: Clamped Patch)
"Custom"
.
The point selection will be removed from the original object.
There are also tools available that clamp a patch in u- or
v-direction only.
"Custom"
!
This tool does not change the geometry of the patches.
"Custom"
!
This tool does not change the geometry of the patches.
Left: original patch, Right: a knot has been inserted 1 time at t=0.5
"Custom"
.
This tool does not change the geometry of the patches.
The point selection will be removed from the original object.
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 are changed, the tesselation will be recomputed and displayed, thus, allowing an immediate estimation of the tesselation quality.
If the preference option "Modelling/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
objects. This tag will be evaluated later, when the respective
objects will be converted to PolyMesh objects. Since Ayam 1.11 the
conversion mechanism of objects keeps the "TP"
tags, so that you
may e.g. save tesselation parameters for a sphere or a revolve object.
<Tab>
key. The resolution of the slider is calculated
automatically from the resolution of the value entered in the entry
widget.See section Miscellaneous Preferences for a more extensive discussion of the tesselation methods and their parameter(s).