Sketcher CreatePeriodicBSpline: Difference between revisions
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|[[Sketcher_CreateBSpline| |
|[[Sketcher_CreateBSpline|B-spline by control points]] |
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|[[Sketcher_CreateBSplineByInterpolation|B-spline by knots]] |
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|IconL=Sketcher_CreateBSpline.svg |
|IconL=Sketcher_CreateBSpline.svg |
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|MenuLocation= Sketch → Sketcher geometries → Create periodic B-spline |
|MenuLocation= Sketch → Sketcher geometries → Create periodic B-spline |
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|Workbenches=[[Sketcher_Workbench|Sketcher]] |
|Workbenches=[[Sketcher_Workbench|Sketcher]] |
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|Shortcut={{KEY|G}} {{KEY|B}} {{KEY|P}} |
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|Version=0.17 |
|Version=0.17 |
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|SeeAlso=[[Sketcher_CreateBSpline|Sketcher |
|SeeAlso=[[Sketcher_CreateBSpline|Sketcher CreateBSpline]] |
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The [[Image:Sketcher_CreatePeriodicBSpline.svg|24px]] [[Sketcher_CreatePeriodicBSpline|Sketcher CreatePeriodicBSpline]] tool creates a periodic (closed) B-spline curve from control points. See [[B-Splines|this page]] for more information about B-splines. |
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[[File:Sketcher Periodic B-spline example01.png|none]] |
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{{Caption|A periodic B-spline curve (in white) made from 5 points. Pictured are the control polygon in green (the straight lines connecting the red points), the weight circles in blue and the curvature comb in green. The (3) digit in the centre refers to the degree of the B-spline, and the (1) and (2) digits on the knots lying on the curve refer to their multiplicity.}} |
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==Usage== <!--T:5--> |
==Usage== <!--T:5--> |
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See also: [[Sketcher_Workbench#Drawing_aids|Drawing aids]]. |
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# There are several ways to invoke the tool: |
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# Press the {{Button|[[ |
#* Press the {{Button|[[Image:Sketcher_CreatePeriodicBSpline.svg|16px]] [[Sketcher_CreatePeriodicBSpline|Periodic B-spline by control points]]}} button. |
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# Create a series of points by clicking in the 3D view. While the command is active, the created points are connected with straight lines, and a construction circle is created centred on each point. |
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#* Select the {{MenuCommand|Sketcher → Sketcher geometries → [[Image:Sketcher_CreatePeriodicBSpline.svg|16px]] Create periodic B-spline}} option from the menu. |
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# Pick the first curve point, or right-click to terminate the input and generate the curve. |
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#* Use the keyboard shortcut: {{KEY|G}} then {{KEY|B}}, then {{KEY|P}}. |
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# Depending on preferences, the tool may remain active to trace a new curve. Right-click again to exit the command. |
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# For further steps see [[Sketcher_CreateBSpline#Usage|Sketcher CreateBSpline]]. |
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* It is possible to define the weight of the control points by changing the radii of the weight circles. The equality constraints on the circles need to be deleted first. The radius constraint is arbitrary, the weight of the control points will be defined by the relative radii of the circles. It works similar to gravity: the bigger a circle is in relation to the others, the more the curve will be attracted to the control point. |
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* The visibility of the control polygon, the curvature comb, the degree and the knot multiplicity can be toggled on/off from the [[Sketcher_Workbench#Sketcher_B-spline_tools|B-spline tools]] toolbar. |
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* Check out the other tools in the [[Sketcher_Workbench#Sketcher_B-spline_tools|B-spline tools]] toolbar for more B-spline editing tools. |
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==Notes== <!--T:14--> |
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See [[Sketcher_CreateBSpline#Notes|Sketcher CreateBSpline]]. |
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* Many types of constraints are not supported at this time. Only the B-spline's control points and knots can be constrained. |
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* [[Sketcher_Trimming|Trimming]] and [[Sketcher_Extend|extend]] tools are not supported. |
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==Limitations== <!--T:7--> |
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* The shape of a B-spline curve can only be edited by dragging one of the control points. The knots lying on the curve cannot be selected. |
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See [[Sketcher_CreateBSpline#Limitations|Sketcher CreateBSpline]]. |
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|[[Sketcher_CreateBSpline| |
|[[Sketcher_CreateBSpline|B-spline by control points]] |
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|IconR=Sketcher_CreateBSplineByInterpolation.svg |
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Latest revision as of 09:19, 13 April 2024
Sketcher CreatePeriodicBSpline |
Menu location |
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Sketch → Sketcher geometries → Create periodic B-spline |
Workbenches |
Sketcher |
Default shortcut |
G B P |
Introduced in version |
0.17 |
See also |
Sketcher CreateBSpline |
Description
The Sketcher CreatePeriodicBSpline tool creates a periodic (closed) B-spline curve from control points. See this page for more information about B-splines.
Usage
See also: Drawing aids.
- There are several ways to invoke the tool:
- Press the Periodic B-spline by control points button.
- Select the Sketcher → Sketcher geometries → Create periodic B-spline option from the menu.
- Use the keyboard shortcut: G then B, then P.
- For further steps see Sketcher CreateBSpline.
Notes
Limitations
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
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- Help: Tutorials, Video tutorials
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