[vtkusers] vtkTubeFilter

[guanwen zhang]

Hi,

I have a line with a few segments. I want to
create a tube around the line using vtkTubeFilter.
However, the tube only encloses the line with 180
degree instead of 360 degree. So the tube is half
open.

How can I make the tube fully closed instead of
being half open?

My code is listed below. Thanks!


# This example demonstrate the use of VTK data arrays
as attribute
# data as well as field data. It creates geometry
(vtkPolyData) as
# well as attribute data explicitly.

package require vtk
package require vtkinteraction

# Create a float array which represents the points.
vtkFloatArray pcoords
# Note that by default, an array has 1 component.
# We have to change it to 3 for points
pcoords SetNumberOfComponents 3
# We ask pcoords to allocate room for at least 4
tuples
# and set the number of tuples to 4.
pcoords SetNumberOfTuples 4
# Assign each tuple. There are 5 specialized versions
of SetTuple:
# SetTuple1 SetTuple2 SetTuple3 SetTuple4 SetTuple9
# These take 1, 2, 3, 4 and 9 components respectively.
pcoords SetTuple3 0 0.0 0.0 0.0
pcoords SetTuple3 1 1.0 0.0 0.0
pcoords SetTuple3 2 2.0 0.0 0.0
pcoords SetTuple3 3 3.0 0.0 0.0

# Create vtkPoints and assign pcoords as the internal
data array.
vtkPoints points
points SetData pcoords

# Create the cells. In this case, a triangle strip
with 2 triangles
# (which can be represented by 4 points)
vtkCellArray strips
strips InsertNextCell 2
strips InsertCellPoint 0
strips InsertCellPoint 1
strips InsertNextCell 2
strips InsertCellPoint 1
strips InsertCellPoint 2
strips InsertNextCell 2
strips InsertCellPoint 2
strips InsertCellPoint 3

# Create an integer array with 4 tuples. Note that
when using
# InsertNextValue (or InsertNextTuple1 which is
equivalent in
# this situation), the array will expand automatically
vtkIntArray temperature
temperature SetName "Temperature"
temperature InsertNextValue 10
temperature InsertNextValue 20
temperature InsertNextValue 30
temperature InsertNextValue 40

# Create a double array.
vtkDoubleArray vorticity
vorticity SetName "Vorticity"
vorticity InsertNextValue 2.7
vorticity InsertNextValue 4.1
vorticity InsertNextValue 5.3
vorticity InsertNextValue 3.4

# Create the dataset. In this case, we create a
vtkPolyData
vtkPolyData polydata
# Assign points and cells
polydata SetPoints points
polydata SetLines strips
# Assign scalars
[polydata GetPointData] SetScalars temperature
# Add the vorticity array. In this example, this field
# is not used.
[polydata GetPointData] AddArray   vorticity



vtkTubeFilter streamTube
    streamTube SetInput polydata
    streamTube SetRadius 0.10
    streamTube SetNumberOfSides 12
    streamTube SetVaryRadiusToVaryRadiusByVector
vtkPolyDataMapper mapStreamTube
    mapStreamTube SetInput [streamTube GetOutput]
    eval mapStreamTube SetScalarRange \
       [[[polydata GetPointData] GetScalars]
GetRange];
vtkActor streamTubeActor
    streamTubeActor SetMapper mapStreamTube
    [streamTubeActor GetProperty] BackfaceCullingOn
    



# Create the mapper and set the appropriate scalar
range
# (default is (0,1)
vtkPolyDataMapper mapper
mapper SetInput polydata
mapper SetScalarRange 0 40

# Create an actor.
vtkActor actor
actor SetMapper mapper
actor RotateZ 90

# Create the rendering objects.
vtkRenderer ren
#ren AddActor actor
ren AddActor streamTubeActor
ren SetBackground 1 1 1

vtkRenderWindow renWin
renWin AddRenderer ren

vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
iren AddObserver UserEvent {wm deiconify .vtkInteract}
iren Initialize

wm withdraw .



__________________________________
Do you Yahoo!?
Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes
http://hotjobs.sweepstakes.yahoo.com/signingbonus