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Click Spline
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The Spline Definition dialog box appears. |
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Select two or more points where the spline is to pass.
An updated spline is visualized each time a point is selected.
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It is possible to edit the spline by first selecting a
point in the dialog box list then choosing a button to either:
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Add a point
after the selected point
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Add a point
before the selected point
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Remove the
selected point
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Replace the
selected point by another point.
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You can select the Geometry on support
check box, and select a support (plane, surface), if you want the
spline to be projected onto a support surface.
It is better when the tangent directions belong to the support,
that is when a projection is possible. In this case just select a
surface or plane. Here, the spline was created on a planar grid. |
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Use the Close Spline option to create a closed
curve, provided the geometric configuration allows it.
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Spline with Close Spline option unchecked |
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Spline with Close Spline option checked |
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Click Show Parameters to display further
options.
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To set tangency conditions onto
any point of the spline, select the point and click in Tangent Dir.
field.
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There are two ways of imposing tangency and curvature
constraints: |
- Explicit: select a line or plane to which the
tangent on the spline is parallel at the selected point
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- From curve: select a curve to which the spline is
tangent at the selected point.
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Use the Remove Tgt., Reverse Tgt., or
Remove Cur. to manage the different imposed tangency and
curvature constraints. |
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Spline with a tangency constraint on endpoint (tension = 2) |
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Spline with reversed tangent |
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To specify a curvature constraint at any point of the
spline, once a tangency constraint has been set, indicate a curvature
direction and enter a radius value:
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Click OK to create the spline.
The spline (identified as Spline.xxx) is added to the
specification tree. |
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To add a parameter to a point,
select a line in the Points list. This list is highlighted.
You have two possibilities:
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