
This
task shows you how to create
wireframe geometry by intersecting elements. You can intersect:
 wireframe elements
 solid elements
 surfaces


Open the
Intersection1.CATPart document. 


Click Intersection
.
The Intersection
Definition dialog box appears as well as the Tools Palette.
For further information about the Tools Palette, refer to Selecting
Using Selection Traps in the CATIA Infrastructure User's Guide. 


Select the two elements to be intersected.
The intersection is displayed. 

Multiselection
is available on the first and second selection, meaning that you can
select several elements to be intersected as well as several
intersecting elements. For instance you can select a whole
geometrical set. 

Choose the type of intersection to
be displayed.
 a Curve (when intersecting two curves):



 Points (when intersecting two curves):



 a Contour: when intersecting a solid element with a
surface :



 a Face: when intersecting a solid element with a
surface (we increased the transparency degree on the pad and
surface):



Click OK to create the intersection element.
This element (identified as Intersect.xxx) is added
to the specification tree. 



The above example shows the line resulting
from the intersection of a plane and a surface 

The above example shows the curve resulting
from the intersection of two surfaces 


Additional Parameters


Several options can be defined to improve the
preciseness of the intersection. 

Open the
Intersection2.CATPart document. 



 Extrapolate intersection on first element
enables to perform an extrapolation on the first selected element,
in the case of a surfacesurface intersection. In all the other cases,
the option will be grayed.



Intersection with the Extrapolation option unchecked 

Intersection with the Extrapolation option checked 


 Intersect non coplanar line segments
enables to perform an intersection on two nonintersecting lines.
When selecting this option, both Extend linear
supports for intersection options are selecting too. 



Intersection between the light green line and the blue line:
the intersection point is calculated after the blue line is
extrapolated 

Intersection between the pink line and the blue line: the
intersection is calculated as the midpoint of minimum distance
between the two lines 



The following capabilities are
available: Stacking Commands
and Selecting Using
MultiOutput. 

 If you select a body or a hybrid body
containing both solid and wireframe elements as input, only the
solid elements are taken into account to compute the intersection.
 Avoid using input elements which are tangent to each other
since this may result in geometric instabilities in the tangency
zone.
 If the intersection stops at an edge
and providing the edge can be merged with the intersecting element
(if the distance is less than 0.1mm), then it is projected onto the
intersecting element. The projection is integrated to the
intersection result.


