Sketcher BSplineComb: Difference between revisions

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<languages/>
<languages/>
<translate>
<translate>

<!--T:10-->
<!--T:10-->
{{Docnav
{{Docnav
|[[Sketcher_BSplinePolygon|Show/Hide B-spline control polygon]]
|[[Sketcher_BSplinePolygon|Show/hide B-spline control polygon]]
|[[Sketcher_BSplineKnotMultiplicity|Show/Hide B-spline knot multiplicity]]
|[[Sketcher_BSplineKnotMultiplicity|Show/hide B-spline knot multiplicity]]
|[[Sketcher_Workbench|Sketcher]]
|[[Sketcher_Workbench|Sketcher]]
|IconL=Sketcher_BSplinePolygon.svg
|IconL=Sketcher_BSplinePolygon.svg
|IconC=Workbench_Sketcher.svg
|IconR=Sketcher_BSplineKnotMultiplicity.svg
|IconR=Sketcher_BSplineKnotMultiplicity.svg
|IconC=Workbench_Sketcher.svg
}}
}}


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{{GuiCommand
{{GuiCommand
|Name=Sketcher BSplineComb
|Name=Sketcher BSplineComb
|MenuLocation=Sketch → Sketcher B-spline tools → Show/hide B-spline curvature comb
|Workbenches=[[Sketcher Workbench|Sketcher]]
|Workbenches=[[Sketcher_Workbench|Sketcher]]
|MenuLocation=Sketch → Sketcher B-spline tools → Show/Hide B-spline curvature comb
|Version=0.17
|Version=0.17
|SeeAlso=[[Sketcher CompCreateBSpline|Create B-spline]]
|SeeAlso=[[Sketcher_CompCreateBSpline|Sketcher Create B-spline]]
}}
}}


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<!--T:9-->
<!--T:9-->
Shows or hides the display of the Curvature Comb of a B-spline curve (see [https://en.wikipedia.org/wiki/B-spline B-spline]).
Shows or hides the display of the Curvature Comb of a B-spline (see [[B-Splines|this page]] for more info about B-splines).

<!--T:16-->
The curvature comb indicates the curvature (value of the second-order derivative) of the B-spline at every position. The higher the curvature at a position, the more is the the comb away from the curve. For positive curvatures ("turn to the right"), the comb is at the other side of the curve than for negative curvatures.


</translate>
</translate>
[[File:sketcher_BSplineCurvatureShow.png]] '''<-->''' [[File:sketcher_BSplineCurvatureHide.png]]
[[File:sketcher_BSplineCurvatureShow.png]]
<translate>
<translate>
<!--T:18-->
{{Caption|B-spline with a saddle point at its mid position - the curvature comb there is zero.}}


==Usage== <!--T:5-->
==Usage== <!--T:19-->
# Select a B-spline and apply.


<!--T:5-->
==Options==
# Select a B-spline
# Either use the toolbar button {{Button|[[File:Sketcher_BSplineComb.svg|16px]] [[Sketcher_BSplineComb|Show/hide B-spline curvature comb]]}} or use the menu {{MenuCommand|Sketch → Sketcher B-spline tools → [[File:Sketcher_BSplineComb.svg|16px]] Show/hide B-spline curvature comb}}.


==Limitations==

==Scripting==


<!--T:8-->
<!--T:8-->
{{Docnav
{{Docnav
|[[Sketcher_BSplinePolygon|Show/Hide B-spline control polygon]]
|[[Sketcher_BSplinePolygon|Show/hide B-spline control polygon]]
|[[Sketcher_BSplineKnotMultiplicity|Show/Hide B-spline knot multiplicity]]
|[[Sketcher_BSplineKnotMultiplicity|Show/hide B-spline knot multiplicity]]
|[[Sketcher_Workbench|Sketcher]]
|[[Sketcher_Workbench|Sketcher]]
|IconL=Sketcher_BSplinePolygon.svg
|IconL=Sketcher_BSplinePolygon.svg
|IconR=Sketcher_BSplineKnotMultiplicity.svg
|IconC=Workbench_Sketcher.svg
|IconC=Workbench_Sketcher.svg
|IconR=Sketcher_BSplineKnotMultiplicity.svg
}}
}}

<!--T:11-->
{{Sketcher Tools navi}}

<!--T:12-->
{{Userdocnavi}}


</translate>
</translate>
{{Sketcher_Tools_navi{{#translation:}}}}
{{clear}}
{{Userdocnavi{{#translation:}}}}

Revision as of 17:01, 14 April 2022

Sketcher BSplineComb

Menu location
Sketch → Sketcher B-spline tools → Show/hide B-spline curvature comb
Workbenches
Sketcher
Default shortcut
None
Introduced in version
0.17
See also
Sketcher Create B-spline

Description

Shows or hides the display of the Curvature Comb of a B-spline (see this page for more info about B-splines).

The curvature comb indicates the curvature (value of the second-order derivative) of the B-spline at every position. The higher the curvature at a position, the more is the the comb away from the curve. For positive curvatures ("turn to the right"), the comb is at the other side of the curve than for negative curvatures.

B-spline with a saddle point at its mid position - the curvature comb there is zero.

Usage

  1. Select a B-spline
  2. Either use the toolbar button Show/hide B-spline curvature comb or use the menu Sketch → Sketcher B-spline tools → Show/hide B-spline curvature comb.