Sketcher BSplineComb: Difference between revisions

Latest revision as of 20:22, 16 April 2024

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Show/hide B-spline control polygon

Show/hide B-spline knot multiplicity

Sketcher

Menu location
Sketcher BSplineComb
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

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.

Show/hide B-spline control polygon

Show/hide B-spline knot multiplicity

Sketcher

General: Create sketch, Edit sketch, Map sketch to face, Reorient sketch, Validate sketch, Merge sketches, Mirror sketch, Leave sketch, View sketch, View section, Toggle grid, Toggle snap, Configure rendering order, Stop operation

Sketcher geometries: Point, Line, Arc, Arc by 3 points, Circle, Circle by 3 points, Ellipse, Ellipse by 3 points, Arc of ellipse, Arc of hyperbola, Arc of parabola, B-spline by control points, Periodic B-spline by control points, B-spline by knots, Periodic B-spline by knots, Polyline, Rectangle, Centered rectangle, Rounded rectangle, Triangle, Square, Pentagon, Hexagon, Heptagon, Octagon, Regular polygon, Slot, Fillet, Corner-preserving fillet, Trim, Extend, Split, External geometry, Carbon copy, Toggle construction geometry

Sketcher constraints:
- Geometric constraints: Coincident, Point on object, Vertical, Horizontal, Parallel, Perpendicular, Tangent, Equal, Symmetric, Block
- Dimensional constraints: Lock, Horizontal distance, Vertical distance, Distance, Radius or weight, Diameter, Auto radius/diameter, Angle, Refraction (Snell's law)
- Constraint tools: Toggle driving/reference constraint, Activate/deactivate constraint

Sketcher tools: Select unconstrained DoF, Select associated constraints, Select associated geometry, Select redundant constraints, Select conflicting constraints, Show/hide internal geometry, Select origin, Select horizontal axis, Select vertical axis, Symmetry, Clone, Copy, Move, Rectangular array, Remove axes alignment, Delete all geometry, Delete all constraints

Sketcher B-spline tools: Show/hide B-spline degree, Show/hide B-spline control polygon, Show/hide B-spline curvature comb, Show/hide B-spline knot multiplicity, Show/hide B-spline control point weight, Convert geometry to B-spline, Increase B-spline degree, Decrease B-spline degree, Increase knot multiplicity, Decrease knot multiplicity, Insert knot, Join curves

Sketcher virtual space: Switch virtual space

Additional: Sketcher Dialog, Preferences, Sketcher scripting

User documentation

Getting started
Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate

Help: Tutorials, Video tutorials
Workbenches: Std Base, Arch, Assembly, CAM, Draft, FEM, Inspection, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Start, Surface, TechDraw, Test Framework, Web

Addons: Addon Manager, External workbenches, Scripting and macros

Hubs: User hub, Power users hub, Developer hub

@@ Line 1: / Line 1: @@
 <languages/>
+{{Page_in_progress}}
 <translate>
 <!--T:10-->
 {{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]]
 |IconL=Sketcher_BSplinePolygon.svg
-|IconC=Workbench_Sketcher.svg
 |IconR=Sketcher_BSplineKnotMultiplicity.svg
+|IconC=Workbench_Sketcher.svg
 }}
@@ Line 14: / Line 16: @@
 {{GuiCommand
 |Name=Sketcher BSplineComb
+|MenuLocation=Sketch → Sketcher visual → Show/hide B-spline information layer → 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
-|SeeAlso=[[Sketcher CompCreateBSpline|Create B-spline]]
+|SeeAlso=[[Sketcher_CreateBSpline|Sketcher CreateBSpline]]
 }}
@@ Line 23: / Line 25: @@
 <!--T:9-->
+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.
-Shows or hides the display of the Curvature Comb of a B-spline curve (see [https://en.wikipedia.org/wiki/B-spline B-spline]).
+<!--T:16-->
-The curvature comb indicates the curvature of the 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.
-</translate>
-[[File:sketcher_BSplineCurvatureHide.png]]
-<translate>
-versus
 </translate>
 [[File:sketcher_BSplineCurvatureShow.png]]
 <translate>
+<!--T:18-->
+{{Caption|B-spline with a saddle point at its midpoint, the curvature comb is zero there.}}
-==Usage== <!--T:5-->
+==Usage== <!--T:19-->
-# Select a B-spline and apply.
-==Options== <!--T:13-->
+<!--T:5-->
+# 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.
+#* Select the {{MenuCommand|Sketch → Sketcher visual → Show/hide B-spline information layer → [[Image:Sketcher_BSplineComb.svg|16px]] Show/hide B-spline curvature comb}} option from the menu.
-==Limitations== <!--T:14-->
-==Scripting== <!--T:15-->
 <!--T:8-->
 {{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]]
 |IconL=Sketcher_BSplinePolygon.svg
-|IconC=Workbench_Sketcher.svg
 |IconR=Sketcher_BSplineKnotMultiplicity.svg
+|IconC=Workbench_Sketcher.svg
 }}
 </translate>
-{{Sketcher Tools navi{{#translation:}}}}
+{{Sketcher_Tools_navi{{#translation:}}}}
 {{Userdocnavi{{#translation:}}}}
-{{clear}}