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This task shows how to split a surface or
wireframe element by means of a cutting element.
You can split a wireframe element by a point, another wireframe element or
a surface; or a surface by a wireframe element or another surface. |
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Open the
Split1.CATPart document. |
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Click Split
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The Split Definition dialog box appears. |
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Select the element to be split.
You should make your selection by clicking on the
portion that you want to keep after the split. |
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You can
select several elements to cut. In that case, click Element to
cut again or click
. The Elements to
cut dialog box opens. Select as many elements as needed. Click Close
to return to the Split Definition dialog box. The number of selected
elements is displayed in the Element to cut field. |
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Click Remove or
Replace to modify the elements list.
When several elements to cut are selected,
the selected portions are not taken into account as parts to keep.
The parts to be kept depend on the type of the cutting element
(point, curve, surface, etc.) and the orientation of cutting elements
and the elements to cut.
Click Other side to reverse the portion to be kept,
element by element. |
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Select the cutting element.
A preview of the split appears. You can change the
portion to be kept by selecting that portion. |
You can also select the portion to be kept by
clicking the Other side button.
This option applies on all selected elements to cut. |
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You can select several
cutting elements. In that case, note that the selection order is
important as the area to be split is defined according to the side to
be kept in relation to the current splitting element. |
You can create a Join as the
splitting element, by right-clicking Cutting elements and
choosing Create Join.
If you split a surface and you keep both
sides by joining the resulting splits, you cannot access the internal
sub-elements of the join: indeed, splits result from the same surface
and the cutting elements are common. |
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Click OK to split the element.
The created element (identified as Split.xxx) is
added to the specification tree. |
In the case several elements to cut were used, the
created elements are aggregated under a Multi-Output.xxx feature. |
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In the illustrations below, the top-left line is the
first splitting element. In the left illustration it defines an area
that intersects with the other three splitting curves, and in the
illustration to the right, these three elements are useless to split
the area defined by the first splitting element. |
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Would you need to remove or replace one of these
cutting elements, select it from the list and click Remove
or Replace . |
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Keeping or Removing Elements
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Elements to remove and
Elements to keep allows to define the portions to be removed or kept
when performing the split operation.
- Click Show parameters >>.
- Click in the field of your choice to be able to select the elements
in the 3D geometry.
- Right-click in the field either to clear the selection or display the
list of selected elements.
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Only the selected element is removed.
All other elements are kept |
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The selected elements are kept.
All other elements are removed |
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- You must select sub-elements as elements to keep or to remove;
otherwise, a warning message is issued.
- You can also select a point to define
the portion to keep or to remove.
A contextual menu is available on the Elements to
remove and Elements to keep fields. |
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- You do not need to select elements to keep if you already
selected elements to remove and vice-versa.
- Select Keep both sides to retain the other side of
the split element after the operation. In that case it appears as
aggregated under the first element.
Therefore both split elements can only be edited together
and the aggregated element alone cannot be deleted. |
If you use the Datum mode, the
second split element is not aggregated under the first one, but
two datum surfaces are created. |
- Avoid splitting geometry when the
intersection between the element to cut and the cutting element is
merged with an edge of the element to cut. We advise you to use the Elements to remove and
Elements to keep options to remove the positioning
ambiguity.
- In case there are several elements to cut, Keep/Remove
and Keep both sides only
apply on the first selected element.
- In case the intersection between the
elements is not connex, an error message may be issued prompting
you to choose the elements to be kept or not.
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Select
the
Ignore no intersecting elements check box to split many elements
(curves, surfaces, volumes)
when the cutting element does not intersect all the elements.
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When this option is selected, the
Intersections
computation option is cleared and grayed
out. |
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Select
the
Keep
elements in half space check box to keep all the elements that
are on one side of the cutting infinite plane.
The cutting element defines this half space.
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- This
option applies only when the cutting element is an
infinite plane.
- If the split side is not towards the element to
cut, an error message is issued. Note that, this
behavior differs from the behavior in the Part
Design workbench, i.e. no error message is issued.
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When this option is selected, the
Ignore no intersecting elements option is automatically
selected and grayed out. |
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Elements to cut: dark blue and light blue surfaces
Cutting elements: yellow and purple planes |
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Result with
Ignore no intersecting elements selected |
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Element to cut: non connex
light blue surface
Cutting element: yellow plane |
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Result with
Keep elements in half space selected |
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Intersecting and extrapolating
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- Select Intersections computation to create an aggregated
intersection when performing the splitting operation. This element will
be added to the specification tree as Intersect.xxx.
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In case there are several elements
to cut, the Intersections computation option only applies
on the first selected element. |
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- Clear Automatic extrapolation if do
not you want the automatic extrapolation of the cutting curve.
When a splitting curve is extrapolated,
the extrapolation will be performed on the original curve, providing the
underlying geometry (that is the curve) is long enough to be used for
the extrapolation. |
If Automatic extrapolation is deselected, an error
message is issued when the cutting element needs to be extrapolated,
and the latter is highlighted in red in the 3D geometry. |
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This option is available in the
case of a split surface/curve or surface/surface. |
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Splitting Wires
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- When splitting a wire (curve, line, sketch and so forth) by another
wire, you can select a support to define the area that will be kept after
splitting the element. It is defined by the vectorial product of the
normal to the support and the tangent to the splitting element.
This is especially recommended when splitting a
closed wire. |
The non disconnected elements of the element to cut
are kept in the result of the split. |
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Splitting with no support selected, first solution |
Splitting with no support selected, second solution |
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Splitting with a selected support (xy plane), first solution |
Splitting with a selected support (xy plane), second solution |
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