||It is difficult to re-create surfaces from a network of
to make sure that they are perfectly continuous.
This task shows how to improve a node of the network to this purpose:
- the action modifies a set of curves arriving at a same node so that
they have the same extremity
(G0 continuity) and the same tangent plane at this node (G1 continuity).
- this ensures that all surfaces built on each mesh arriving at this
node are continuous in tangency.
The curves may be simple curves, 3D curves, face edges...
Curves are deformed :
- to be made G0 continuous (passage continuity) in all cases,
- to be made G1 continuous (tangency continuity) according to your needs
(for example, you do not want to apply a tangency continuity constraint on
a sharp edge).
It is also possible to make two curves tangent to each other.
Only the curves constrained to the tangent plane are made tangent to each
The curves set to Continuous only cannot be made tangent.
The G0 continuity can be tuned up using the Maximum deviation
i.e. the maximum distance between the input curve and the deformed curve.
The G1 continuity can be tuned up using the Max Angle G1
below which curves are made tangent to each other.
- This action complies now with a feature-based approach.
- The result of Adjust Node feature is a multi-domain curve.
||Since the result of Adjust Node feature is a multi-domain
the deletion of one of its input curves may result in an update error for
that use the adjusted node as input.
- Therefore standard selection tools, including the user selection
filter and the geometrical element filter,
can be used.
For further information, please refer to Selecting Using a Filter
in the Infrastructure User's Guide.
- After the creation of the result Adjust Node, all input curves are
sent to the NoShow.
- It is possible to create datum curves (instead of the feature) by
Create Datum in the "Tools" bar.
- Multi-domain and multi-edges elements are not accepted as input.
If you select such an element, the following messages are displayed
to select each sub-element separately by activating the Geometrical
Element Filter of the User Selection Filter.
AdjustNode01.CATPart from the samples directory.
Define an In Work Object.
Click Adjust Nodes
The Adjust Node dialog box is displayed.
By default, the check boxes Max Angle G1 and Global
deformation are selected.
Their status and that of Max deviation are modal.
Select the curves to adjust. They are listed
in the Selected Curves field.
|You can deselect a curve by picking it, or select another curve.
By default, the curves are "Continuous
Click the label of a curve, or
right-click to launch its contextual menu,
to change its status.
The available statuses are:
Continuous and tangent: the
deformed curves are G0 continuous and
tangent to the computed tangency plane.
Continuous: the deformed
curves are only G0 continuous.
Fixed: the curves are not
deformed. In particular, face edges are fixed and remain fixed.
Click Apply. The deformations are computed:
The curves selected are highlighted,
The curves modified are displayed in green,
If there are tangency constraints, the tangency
plane is displayed in white,
Its vector are displayed in pink,
The maximum deviation is also displayed on the most
not necessarily on that deformation spot.
|The curves are deformed to
reach the required continuity.
By default, the Global deformation check box is selected
and distributes the deformation more evenly on the whole curves.
The degree and the structure of the curves are kept.
Clear this check box for a local deformation, meaning the curves are
deformed at their extremities.
The result may not be satisfactory. In that case, you
Select the Max deviation check box and
type the value of the maximum allowed deviation.
Click Apply, the deformation of the curves is computed
If the deformation is greater than the requested tolerance, no
adjusted node can be created.
You have to modify this tolerance.
Make sure the Max Angle G1 check box is
selected to force a tangency constraint on the curve
endpoints when the angle of the tangents at those ends is lower than
the Max Angle G1 value.
Click OK to validate the action.
Multi-Result Management dialog box is displayed.
Select the option you require and click OK.
Click OK to validate.
|An Adjusted.Node.X feature is created in the
specification tree, the input curves are hidden.
|In Datum mode, x new curves are created while the x input curves
This action processes one node at a time.
There must be more than one curve to adjust.
Several non continuous fixed curves may lead to
If some curves are deformed too far apart with respect to
the adjustment cannot be computed and an error message is displayed.