Sketcher BSplinePoleWeight: Difference between revisions
(initial) |
(more info) |
||
| Line 26: | Line 26: | ||
</translate> |
</translate> |
||
[[File:sketcher_BSplineWeightShow.png]] |
[[File:sketcher_BSplineWeightShow.png|468px]] |
||
<translate> |
<translate> |
||
{{Caption|B-spline with control point weights displayed in brackets}} |
|||
</translate> |
|||
[[File:sketcher_BSplineWeightHide.png|468px]] |
|||
<translate> |
|||
{{Caption|Same B-spline without weights}} |
|||
The weights determine how the control points are taken into account. |
|||
The weight is the factor with with the spline basis is multiplied for the corresponding control point. Therefore, if all weights are equal, the shape of the spline does not change. So the weights relative to each other is important, not the value alone. For example this spline has exactly the same shape as the one in the first image: |
|||
</translate> |
|||
[[File:sketcher_BSplineWeightDouble.png|468px]] |
|||
<translate> |
|||
{{Caption|Same B-spline as in first image but with different absolute weight values}} |
|||
A weight of 0 means the control point is not taken into account, as if it would not exist. For example if the third control point in the above spline has weight 0, it becomes this: |
|||
</translate> |
|||
[[File:sketcher_BSplineWeightZero.png|468px]] |
|||
<translate> |
|||
{{Caption|Same B-spline with a zero weight control point}} |
|||
==Usage== <!--T:5--> |
==Usage== <!--T:5--> |
||
Revision as of 00:46, 9 November 2020
|
|
| Menu location |
|---|
| Sketch → Sketcher B-spline tools → Show/Hide B-spline control point weight |
| Workbenches |
| Sketcher |
| Default shortcut |
| None |
| Introduced in version |
| 0.19 |
| See also |
| Create B-spline |
Description
Shows or hides the display of the weight for the control points of a B-spline curve (see B-spline).
B-spline with control point weights displayed in brackets
File:Sketcher BSplineWeightHide.png
Same B-spline without weights
The weights determine how the control points are taken into account. The weight is the factor with with the spline basis is multiplied for the corresponding control point. Therefore, if all weights are equal, the shape of the spline does not change. So the weights relative to each other is important, not the value alone. For example this spline has exactly the same shape as the one in the first image:
Same B-spline as in first image but with different absolute weight values
A weight of 0 means the control point is not taken into account, as if it would not exist. For example if the third control point in the above spline has weight 0, it becomes this:
Same B-spline with a zero weight control point
Usage
- Select a B-spline and apply.
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
- Hubs: User hub, Power users hub, Developer hub