

Click Boundary
.
The Boundary Definition dialog box appears. 


Use the combo to choose the Propagation type:
 Complete boundary: the selected edge is propagated
around the entire surface boundary.
 Point continuity: the selected edge is propagated
around the surface boundary until a point discontinuity is met.
 Tangent continuity: the selected edge is propagated
around the surface boundary until a tangent discontinuity is met.
 No propagation: no propagation or continuity
condition is imposed, only the selected edge is kept.



You can select the
propagation type before selecting an edge. 

Select a Surface edge.
The boundary curve is displayed according to the
selected propagation type. 


No propagation 
Tangent continuity 




Point continuity 
Complete boundary 

You can relimit the boundary curve by means of two
elements.

If you
relimit a closed curve by means of only one element, a point on curve
for instance, the closure vertex will be moved to the relimitation
point, allowing this point to be used by other features. 

Click OK to create the boundary curve.
The curve (identified as Boundary.xxx) is added to
the specification tree. 

You cannot
copy/paste a boundary from a document to another. If you wish to
do so, you need to copy/paste the surface first into the second
document then create the boundary. 
About the Propagation Type

 If you select the surface directly, the Propagation
type no longer is available, as the complete boundary is
automatically generated.


Provided the generated boundary curve is continuous,
you can still select a limiting point to
limit the boundary. 

Using the red arrow, you can then invert the
propagation of the limited
boundary. 

 If you select a curve which has an open
contour, the Propagation type becomes available: choose the No
Propagation type and select the curve again. The extremum
points will define the boundary result.


