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ribbon

Set options for stream ribbons.

Synopsis:

ribbon option=value [,option=value, ...]

Arguments:

option

A plot option for the ribbon plot. See table below.

value

A value associated with the matching option . See table below.

Option

Value

Value Meaning

Default Value

err

real number >= 0.0

A scaled error value. An error of 0.01 means that variations on the order of 1/100 the size of the mesh are filtered out through line reduction. 0.0 indicates no filtering is done.

0.0

density

positive real number

The stream density. This is a scaled parameter. It relates to the "seed point density per unit area"; however, it is scaled such that a density of 1 results in approximately 200 streams. This is so the results are the same whether the mesh is defined in cm, mm, or any other scale.

1.0

legend

on, off

Whether or not a legend should be displayed with the plot.

on

maxsteps

positive integer

Number of integration steps taken per stream.

50

method



euler

rk2

rk4

eulera

rk2a

rk4a

Integration method for computing streams.
1st order Euler integration

2nd order Runge Kutta

4th order Runge Kutta

adaptive step 1st order

adaptive step 2nd order

adaptive step 4th order

rk2

numpoints

positive integer

The number of streamlines to generate for each seed point. Two streamlines will result in a ribbon, while more than two will result in a tube.

2

pop

pop

off

step

real number >= 0.0

Integration step size. This parameter is scaled according to the size of the mesh compared to the magnitudes of the vectors to allow the step size to give similar quality results in a wide variety of meshes. If using an adaptive method, the specified step is used only as an initial value and will be adjusted according to the curvature of the flow at each point.

0.1

var

variable name

Name of the vector variable. The variable defines pseudocoloring as well. A 4d vector is interpreted as {x_component, y_component, z_component, colorvar}.

velocity

Description:

Ribbons are an extension of streams for 3D meshes. Ribbons are generated by meshing a surface between multiple streamlines which are seeded near each other. This depicts the flow through a 3D problem.

Examples:

ribbon numpoints=3, method="rk2a", maxsteps=40

See Also:

pop , stream


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