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This
task shows you how to create
wireframe geometry by intersecting elements and how to regenerate deleted
intersection outputs. You can intersect:
- wireframe elements
- solid elements
- surfaces
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Create a Wireframe Geometry by Intersecting Elements |
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Open the
Intersection1.CATPart document. |
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Click Intersection
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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. |
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Select the two elements to be intersected.
The intersection is displayed. |
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Multi-selection
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. |
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Choose the type of intersection to
be displayed.
- a Curve (when intersecting two curves):
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- Points (when intersecting two curves):
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- a Contour: when intersecting a solid element with a
surface :
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- a Face: when intersecting a solid element with a
surface (we increased the transparency degree on the pad and
surface):
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Click OK to create the intersection element.
This element (identified as Intersect.xxx) is added
to the specification tree. |
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The above example shows the line resulting
from the intersection of a plane and a surface |
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The above example shows the curve resulting
from the intersection of two surfaces |
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Additional Parameters
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Several options can be defined to improve the
preciseness of the intersection. |
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Open the
Intersection2.CATPart document.Extrapolation
Options
These options are only available for surface-surface
intersections.
You can extrapolate the intersection result. |
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- If the Extrapolate intersection on check box is cleared,
the surfaces are intersected without extrapolation.
- If the Extrapolate intersection on check box is selected,
the surfaces are intersected with extrapolation. The results are as
follows:
If the first element option is
selected. |
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If the second element option is
selected |
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If the both element option is
selected |
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- Intersect non coplanar line segments
enables to perform an intersection on two non-intersecting lines.
When selecting this option, both Extend linear
supports for intersection options are selected too. |
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Intersection between the light green line and the blue line:
the intersection point is calculated after the blue line is
extrapolated |
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Intersection between the pink line and the blue line: the
intersection is calculated as the mid-point of minimum distance
between the two lines |
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The following capabilities are
available: Stacking Commands
and Selecting Using
Multi-Output. |
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- 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.
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Regenerate Deleted Intersection Outputs |
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You can regenerate the deleted intersection outputs at any stage of the
design by editing the multi-output feature. This is useful when the
intersection is cancelled due to design modifications and you want to
recover the earlier outputs.
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Open a CATPart document where at least one of the intersection output is
deleted. |
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- Double-click the multi-output feature in the specification tree.
The Intersection Definition
dialog box appears.
- Select the Regenerate all deleted features
check box.
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- The Regenerate all deleted
features check box appears whenever the
multi-output feature has fewer children compared to the
result of number of features in the
First Element box
multiplied by the number of features in the
Second Element box. If
there are no additional intersections, selecting the Regenerate all deleted
features check box will not change the number
of children.
- Depending on your part, even if the above condition is
fulfilled, new intersection outputs are generated only if
they were present in the design before.
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- Optional: Click
Preview.
All intersection features are displayed in the work area. In
the specification tree view, they are aggregated under the multi-output node.
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The outputs are inserted after the last element in
the node and are numbered accordingly, instead of being
inserted at their original positions. |
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- Click OK.
The intersection outputs are regenerated.
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You can undo the regeneration operation to go back
to the previous design stage.
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