Sketcher BSplineComb: Difference between revisions

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|Workbenches=[[Sketcher_Workbench|Sketcher]]
|Workbenches=[[Sketcher_Workbench|Sketcher]]
|Version=0.17
|Version=0.17
|SeeAlso=[[Sketcher_CompCreateBSpline|Sketcher Create B-spline]]
|SeeAlso=[[Sketcher_CreateBSpline|Sketcher CreateBSpline]]
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The [[Image:Sketcher_BSplineComb.svg|24px]] [[Sketcher_BSplineComb|Sketcher BSplineComb]] tool shows or hides the display of the curvature comb of a B-spline (see [[B-Splines|this page]] for more info about B-splines).
The [[Image:Sketcher_BSplineComb.svg|24px]] [[Sketcher_BSplineComb|Sketcher BSplineComb]] tool shows or hides the B-spline curvature comb in all sketches. See [[B-Splines|this page]] for more information about B-splines.


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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.
The curvature comb indicates the curvature (value of the second-order derivative) along a B-spline. The higher the curvature, the longer its teeth are. Where a B-spline curves to the right the comb is on its left side and vice versa.


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{{Caption|B-spline with a saddle point at its mid position - the curvature comb there is zero.}}
{{Caption|B-spline with a saddle point at its midpoint, the curvature comb is zero there.}}


==Usage== <!--T:19-->
==Usage== <!--T:19-->


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# Select a B-spline.
# There are several ways to invoke the tool:
# There are several ways to invoke the tool:
#* Press the {{Button|[[Image:Sketcher_BSplineComb.svg|16px]] [[Sketcher_BSplineComb|Show/hide B-spline curvature comb]]}} button.
#* Press the {{Button|[[Image:Sketcher_BSplineComb.svg|16px]] [[Sketcher_BSplineComb|Show/hide B-spline curvature comb]]}} button.

Revision as of 20:22, 16 April 2024

This documentation is a work in progress. Please don't mark it as translatable since it will change in the next hours and days.

Sketcher BSplineComb

Menu location
Sketch → Sketcher visual → Show/hide B-spline information layer → Show/hide B-spline curvature comb
Workbenches
Sketcher
Default shortcut
None
Introduced in version
0.17
See also
Sketcher CreateBSpline

Description

The Sketcher BSplineComb tool shows or hides the B-spline curvature comb in all sketches. See this page for more information about B-splines.

The curvature comb indicates the curvature (value of the second-order derivative) along a B-spline. The higher the curvature, the longer its teeth are. Where a B-spline curves to the right the comb is on its left side and vice versa.

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

Usage

  1. There are several ways to invoke the tool:
    • Press the Show/hide B-spline curvature comb button.
    • Select the Sketch → Sketcher visual → Show/hide B-spline information layer → Show/hide B-spline curvature comb option from the menu.