Silk ControlPoly4

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CubicCurve_4

Silk

Description

The Silk ControlPoly4 command creates a 4 node control polygon, a ControlPoly4 object, from one or two sketches.

A 3D control polygon built from two Node Sketches

This command is the second of three steps to create a parametric Bezier cubic curve:

1. Create one or two Sketches
2. Create a Silk ControlPoly4
3. Create a Silk CubicCurve_4

Sketch → Control polygon → Resulting Bezier curve

Usage

1. There are several options for a preselection:
   • Select one Sketch in the Tree View or in the 3D View containing a wire of 3 straight line segments.
   • Select two Sketches in the Tree View or in the 3D View, each containing a circle, and a straight line starting at the circle center.
   • Select one Sketch in the Tree View or in the 3D View containing an arbitrary combination of different lines.
2. There are several ways to invoke the tool.
   • Press the ControlPoly4 button.
   • Select the Silk → ControlPoly4 option from the menu.
3. One of the following objects is created:
   • A ControlPoly4_3L object if the first preselection option was chosen.
   • A ControlPoly4_2N object if the second preselection option was chosen.
   • A ControlPoly4_FirstElement object if the last preselection option was chosen.
4. Optionally adjust parameters in the Property View.

Notes

• 4 of these control polygons are used to create a ControlGrid44.
• 3 of these control polygons are used to create a ControlGrid44_Rotate.
• 2 of these control polygons in connection with 2 ControlPoly6 are used to create a ControlGrid64.

Properties

See also: Property View.

All ControlPoly4 objects are derived from a ..., formally a yyy object and inherits all its properties. They also have the following common additional properties:

Data

C1 - Inputs

• Datareverse (Bool): Default is False. Reverses the parameter direction.

C2 - Outputs

• DataLegs (Part::PropertyGeometryList): Control segments.
• DataPoles (VectorList): Poles.

C3 - Identifiers

• DatainternalName (String): The permanent internal FreeCAD name for this object.
• Dataobject_version (String): The class version of this object.

A ControlPoly4_3L also has the following individual additional properties:

Data

C1 - Inputs

• DataSketch (Link): Reference Sketch.
• DataWeights (FloatList): Weights.
• Datatolerance (Float): Default is 1e-06. Point-to-point connection tolerance for the 3 lines.

C3 - Identifiers

• Dataobject_type (String): Default is ControlPoly4_3L. The workbench class used to create this object.

A ControlPoly4_2N object also has the following individual additional properties:

Data

C1 - Inputs

• DataSketch0 (Link): Reference Sketch.
• DataSketch1 (Link): Reference Sketch.
• DataWeights (FloatList): Weights.
• Datatolerance (Float): Default is 1e-06. Point-to-point connection tolerance for the circle-line in each node.

C3 - Identifiers

• Dataobject_type (String): Default is ControlPoly4_2N. The workbench class used to create this object.

A ControlPoly4_FirstElement object also has the following individual additional properties:

Data

C1 - Inputs

• DataSketch (Link): Reference Sketch.
• Datatolerance (Float): Default is 1e-06. Point-to-point connection tolerance for the 3 lines.

C2 - Outputs

• DataWeights (FloatList): Weights.

C3 - Identifiers

• Dataobject_type (String): Default is ControlPoly4_FirstElement. The workbench class used to create this object.

CubicCurve_4

Silk