<< Click to Display Table of Contents >> Navigation: MechDesigner Reference & User Interface > DialogBoxes > Dialog: BlendCurve 
See also Add BlendCurve
A BlendCurve sketchelement has a startPoint and an endPoint. You can use the BlendCurve dialogbox to edit these geometricproperties AT its startPoint and AT its endPoint: •Angle •Curvature •Curvature Rate Typically, you will merge the startPoint and/or endPoint of the BlendCurve with another sketchelements. The default geometricproperties ensure geometric continuity of the BlendCurve with the adjacent sketchelements. Case 0 : The BlendCurve is not merged with another sketchelement. You can edit these geometricproperties at its startPoint and endPoint: •Angle (default = 0) •Curvature (default = 0) •Curvature Rate (default = 0) Default values Case 1 : You merge the startPoint and/or endPoint of the BlendCurve with a Line. •Angle is equal to the angle of the Line •Curvature is equal to zero •Curvature Rate is equal to zero Case 2 : Merge the startPoint and/or endPoint of the BlendCurve with an Arc. •Angle is equal to the tangent of the Arc •Curvature is equal to 1 / Radius of the Arc (m) •Curvature Rate  is equal to zero Case 3 : Merge the startPoint and/or endPoint of the BlendCurve with a BlendCurve. Edit the endPoint of a BlendCurve that you merge with the startPoint of an adjacent, or following, BlendCurve. In the BlendCurve dialogbox, edit the: •Angle : Disable the endPoint Angle checkbox: edit the Angle  the angle of the adjacent BlendCurve with equal the angle you enter. •Curvature : Disable the endPoint Curvature checkbox: edit the Curvature  the curvature of the adjacent BlendCurve with equal the curvature you enter. •CurvatureRate : Disable the endPoint CurvatureRate checkbox: edit the CurvatureRate  the curvaturerate of the adjacent BlendCurve with equal the curvaturerate you enter. You can edit the geometricproperties •Exactly : with the BlendCurve dialogbox •Approximately : with the BlendCurve draghandles. 
In the PartEditor or the MechanismEditor:

The BlendCurve dialogbox is now open.
There are two separators: StartPoint... EndPoint... The parameters are the same for the two separators. 

Start Point ... / End Point ... Angle (Units: º):
Curvature k (Units:1 ∕ meter):
CurvatureRate dk ∕ ds (Units: 1 ∕ m^2):
Velocity Scaling (no units)

Drag handles in the GraphicArea 
To show the DragHandles
Now, you can see the DragHandles at the startPoint and the endPoint There are two(2) DragHandle types:

Arrowhead DragHandle 
Arrowhead DragHandles  this controls the Angle and the VelocityScaling Factor


Circle DragHandle 
Circle DragHandle  this controls the Curvature

Note on Curvature and CurvatureRate
Curvature (k) = 1 / Radius of Curvature The RadiusofCurvature and the Curvature of a simple sketchelements is constant. For example: •Radius of Curvature of a Line = ∞, Curvature of a Line = 0 •Radius of Curvature of an Arc or Circle = Radius, Curvature of a Circle = 1 ∕ Circle Radius, E.g. : A circle has a radius of 20mm, its curvature = 1/0.02m = 50/m. However, the RadiusofCurvature continually changes along a general curve. Thus, the Curvature will also continually change along a general curve. CurvatureRate = dk/ds CurvatureRate = rateofchange of curvature (k) with respect to the displacement (s) along the curve. 