Sketcher CreateBSplineByInterpolation/fr: Difference between revisions

From FreeCAD Documentation
(Created page with "Cet outil crée une courbe B-spline passant par des points donnés. Voir cette page pour plus d'informations sur les B-splines.")
(Created page with "==Utilisation==")
Line 23: Line 23:
Cet outil crée une courbe B-spline passant par des points donnés. Voir [[B-Splines/fr|cette page]] pour plus d'informations sur les B-splines.
Cet outil crée une courbe B-spline passant par des points donnés. Voir [[B-Splines/fr|cette page]] pour plus d'informations sur les B-splines.


<span id="Usage"></span>
<div lang="en" dir="ltr" class="mw-content-ltr">
==Usage==
==Utilisation==
</div>


<div lang="en" dir="ltr" class="mw-content-ltr">
<div lang="en" dir="ltr" class="mw-content-ltr">

Revision as of 09:57, 4 June 2023

Other languages:

Sketcher CreateBSplineByInterpolation

Emplacement du menu
Esquisse → Géometries d'esquisse → Créer une B-spline par interpolation
Ateliers
Sketcher
Raccourci par défaut
G B I
Introduit dans la version
0.21
Voir aussi
Sketcher B-spline périodique

Description

Cet outil crée une courbe B-spline passant par des points donnés. Voir cette page pour plus d'informations sur les B-splines.

Utilisation

  1. Press the B-spline by knots button.
  2. Create a series of points by clicking in the 3D view. While the command is active, the created points are connected with straight lines.
  3. Optionally press M before terminating the input to define the multiplicity of the knot at the last defined point (note that this may not always be respected, see limitations for details).
  4. Optionally press Backspace before terminating the input to delete the last created control point.
  5. Right-click to terminate the input and generate the curve.
  6. Depending on preferences, the tool may remain active to trace a new curve. Right-click again to exit the command.

Notes

Limitations

  • The resultant curve is no different than a curve defined through control points. So all related limitations apply. See Sketcher CreateBSpline.
  • The B-splines created are always cubic (i.e. with degree 3).
  • The defined multiplicity may not always be respected:
    • For a periodic spline, the first knot (coincident with last) always has a multiplicity of 2.
    • For a non-periodic spline, the first and last knots always have a multiplicity of 4.
    • If the points just before and just after have multiplicities >=3, the piece between these two is fully continuous, and this (middle) point will only be constrained with point-on-object. If a knot is needed, consider using the insert knot tool.