

Click Spline
.
The Spline Definition dialog box appears. 

Select two or more points where the spline is to be
created.
An updated spline is visualized each time a point is selected.


It is possible to edit the spline by first selecting
a point in the dialog box list then choosing a button to either: 

add a point
after the selected point

add a point
before the selected point

remove the
selected point

replace the
selected point by another point


You can check the Geometry on support option
and select a support (plane, surface), if you want the spline to be
projected onto a support surface.
It is better when the tangent directions belong to the support,
that is when a projection is possible. 
In this case just select a surface or plane. 

Spline created on a planar support grid 

You can check the Close Spline option to
create a closed curve, provided the geometric configuration allows it.



Spline with Close Spline option unchecked 

Spline with Close Spline option checked 

Click Show parameters to display further
options.

To set tangency conditions onto
any point of the spline, select the point and click on Tangent Dir.

There are two ways of imposing tangency and curvature
constraints: 
 Explicit: select a line or plane to which the
tangent on the spline is parallel at the selected point.
 From curve: select a curve to which the spline is
tangent at the selected point.

Use Remove Tgt., Reverse Tgt.,
or Remove Cur. to manage the different imposed tangency
and curvature constraints. 


Spline with a tangency constraint on endpoint (tension = 2) 
Spline with reversed tangent 

To specify a curvature constraint at any point of the
spline, once a tangency constraint has been set, indicate a curvature
direction and enter a radius value.
The curvature direction is projected onto a plane
normal to the tangent direction. 


If you use the Create line
contextual menu, and want to select the same point as a point already
used to define the tangent direction, you may have to select it from
the specification tree, or use the
preselection navigator. 

Spline with tangency constraint 


Spline with tangency constraint and curvature
constraint (radius = 50mm) 


Spline with tangency constraint and curvature
constraint (radius = 2mm) 

Note that there are prerequisites for the Points Specifications
and you must enter your information in the following order: 
 Tangent Dir. (tangent direction)
 Tangent Tension
 Curvature Dir. (curvature direction)
 Curvature Radius

The fields become active as you select values. 

Click OK to create the spline.
The spline (identified as Spline.xxx) is added to the
specification tree. 


To add a parameter to a point,
select a line in the Points list. This list is highlighted.
You have two possibilities:
 extended parameters
 select any line or plane for the direction.


You cannot
create a spline of which points have a distance lower than the
resolution. 
