View source for Curves ParametricBlendCurve/en

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{{GuiCommand
|Name=Curves ParametricBlendCurve
|MenuLocation=Curves → Blend curve
|Workbenches=[[Curves_Workbench|Curves]]
}}

==Description==

The [[Image:Curves_ParametricBlendCurve.svg|24px]] '''Curves ParametricBlendCurve''' tool creates a Blend curve between two edges.

==Usage==

# Select two curves.
# There are several ways to invoke the tool:
#* Press the {{Button|[[Image:Curves_ParametricBlendCurve.svg|16px]] [[Curves_ParametricBlendCurve|Blend curve]]}} button.
#* Select the {{MenuCommand|Curves → [[Image:Curves_ParametricBlendCurve.svg|16px]] Blend curve}} option from the menu.
# A '''Blend_Curve''' object is created.
# Optionally adjust values in the [[Property_View|Property View]]:
#* Set the {{PropertyData|Parameter1}} and {{PropertyData|Parameter2}} properties to {{Value|0.0 mm}} to use the selected curves' start vertices to place the blend curve's start and end vertices.
#* Set the {{PropertyData|Reverse1}} and {{PropertyData|Reverse2}} properties to {{True}} to switch the selected curves' start and end vertices.

==Notes==

To reverse the orientation of the blend curve's start and end tangents, prefix {{Value|-}} to the value of its {{PropertyData|Scale1}} or {{PropertyData|Scale2}} property.

==Properties==

See also: [[Property_View|Property View]].

A '''Blend_Curve''' object is derived from a [[Part_Feature|Part Feature]] object and inherits all its properties. It also has the following additional properties:

===Data===

{{TitleProperty|Blend Curve}}

* {{PropertyData|Auto Scale|Bool}}: Compute scale values to get minimal curvature along curve.
* {{PropertyData|CurvePts|VectorList}}: Poles of the Bézier curve.
* {{PropertyData|Output|Enumeration}}: Output type.
** {{Value|Single}} (default): The result consists of the blend curve only.
** {{Value|Wire}}: The result consists of three individual curves, the blend curve and also both input curves.
** {{Value|Joined}}: The result consists of one continuous curve made of the blend curve and both input curves.

{{TitleProperty|Edge1}}

* {{PropertyData|Continuity1|Enumeration}}: Continuity level.
** {{Value|C0}} (= G0): The curves touch at the join point.
** {{Value|G1}} (default): As before plus the curves also share a common tangent direction at the join point.
** {{Value|G2}}: As before plus the curves also share a common center of curvature at the join point.
** {{Value|G3}}: As before plus the curves also share a common growth rate of the curvature at the join point.
** {{Value|G4}}: As before plus the curves also share a common acceleration of the growth rate of the curvature at the join point.
* {{PropertyData|Edge1|LinkSub}}: Edge 1.
* {{PropertyData|Parameter1|Distance}}: Location on first edge.
* {{PropertyData|Reverse1|Bool}}: Reverse Edge.
* {{PropertyData|Scale1|Bool}}: Scale of blend curve, negate the value to reverse the tangent orientation.

{{TitleProperty|Edge2}}

* {{PropertyData|Continuity2|Enumeration}}: Continuity level. ({{Value|C0}}, {{Value|G1}}, {{Value|G2}}, {{Value|G3}}, {{Value|G4}}, see above)
* {{PropertyData|Edge2|LinkSub}}: Edge 2.
* {{PropertyData|Parameter2|Distance}}: Location on second edge.
* {{PropertyData|Reverse2|Bool}}: Reverse Edge.
* {{PropertyData|Scale2|Bool}}: Scale of blend curve, negate the value to reverse the tangent orientation.


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