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Dcurve DeformableCurve

Dcurve DeformableCurve

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Dcurve DeformableCurve

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Model Element

Class Name

Dcurve, DeformableCurve

Description

Dcurve defines a deformed curve in MotionSolve.  It is used in the definition of a Point-to-Deformable-Curve constraint (PTDCV)

Attribute Summary

Name

Property

Modifiable by command?

id    

Int    ()

 

label

String ()

 

end_type_left

Enum ("NATURAL PARABOLIC PERIODIC CANTILEVER", default="NATURAL")

 

end_type_right

Enum ("NATURAL PARABOLIC PERIODIC CANTILEVER", default="NATURAL")

 

markers      

Reference (Marker, count=0)

 

u_span      

Double (1.0)

✓

lambda_left  

Double ()

 

lambda_right

Double ()

 

tension      

Double ()

✓

u_closed

Bool ()

 

Usage

DeformableCurve (markers=list, u_span=double, optional_attributes)

Attribute Description

markers

List of references to existing Markers

Specifies the Marker whose origins define this deformable curve.

The markers attribute is mandatory.

u_span

Double

Specifies the parametric span of the curve. The curve parameter, u, is limited to operating in the range: -u_span/2 ≤ u ≤ u_span/2

The u_span attribute is mandatory. A good value for u_span is 1.0.

u_span > 0

id

Integer

Specifies the element identification number.  This number must be unique among all the DeformableCurve objects in the model.

This attribute is optional. MotionSolve will automatically create an ID when one is not specified.

Range of values: id > 0

label

String

Specifies the name of the DeformableCurve object.

This attribute is optional. When not specified, MotionSolve will create a label for you.

end_type_left

String

Defines the end type condition for this deformed curve on the left end of the curve. end_type_left must be one of the following 4 strings:

•“NATURAL”
•“PARABOLIC”
•“PERIODIC”
•“CANTILEVER”

This attribute is optional. When not specified, it defaults to “NATURAL”.

end_type_right

String

Defines the end type condition for this deformed curve on the left end of the curve. end_type_right must be one of the following 4 strings:

•“NATURAL”
•“PARABOLIC”
•“PERIODIC”
•“CANTILEVER”

This attribute is optional. When not specified, it defaults to “NATURAL”.

lambda_left

Double

This parameter is only applicable for the CANTILEVER type end condition. lambda_left is a real valued parameter in the interval [0, 1] that controls the left end condition for CUBIC spline interpolation.

•A value of 0 implies NATURAL end condition
•A value of 1 implies PARABOLIC end condition

This attribute is optional. When not specified, it defaults to 0 (“NATURAL”).

lambda_right

Double

This parameter is only applicable for the CANTILEVER type end condition. lambda_left is a real valued parameter in the interval [0, 1] that controls the left end condition for CUBIC spline interpolation.

•A value of 0 implies NATURAL end condition
•A value of 1 implies PARABOLIC end condition

This attribute is optional. When not specified, it defaults to 0 (“NATURAL”).

u_closed

A Boolean value (True or False) that determines whether the markers that define the curves are closed or not.  

Comments

1.See Properties, for an explanation about what properties are, why they are used and how you can extend these.
2.For a more detailed explanation about Dcurve, see the Comments in the XML syntax section.

Example

This example shows a simple definition of a deformed curve.

#  Define the markers whose origins will form the closed deformable curve

mvec = =[m1091, m2091, m3091, m4091, m5091, m6091, m7091, m8091, m9091, m1091]

 

# Define the deformable curve – with end type = NATURAL

dc1 = DeformableCurve (markers=mvec, u_span=1.0)