[vtkusers] vtkPolyData & vtkActor...

[Andrea Gavana]

Hello NG,
    I am trying to visualize some lines in a 3D space. Every line may
have 2 different colours depending on the state of a certain variable,
something like:

a) MyVariable = True => Line is Red
b) MyVariable = False => Line is Grey

At the moment, I am doing this (sorry, it's Python):

for ii in range(len(MyLines)):
    poly = vtk.vtkPolyData()
    poly.SetPoints(vtk_pts)
    poly.SetLines(vtk_lines)

    profileTubes = vtk.vtkTubeFilter()
    profileTubes.SetRadius(radius)
    profileTubes.SetNumberOfSides(20)
    profileTubes.SetInput(poly)

    wellMapper = vtk.vtkPolyDataMapper()
    wellMapper.SetInput(profileTubes.GetOutput())
    wellMapper.GlobalImmediateModeRenderingOn()

    wellActor = vtk.vtkActor()
    wellActor.SetMapper(wellMapper)

    if MyVariable:
        wellActor.GetProperty().SetColor(red)
    else:
        wellActor.GetProperty().SetColor(grey)

But this snippet of code creates a polydata, filter, a mapper for
every line I have... this, together with the unstructured grid I also
visualize, may kill the performances of my app.

Is there a way to specify all the lines and the points in a single
call to vtkPolyData, putting them in a single vtkTubeFilter, using a
single vtkPolyDataMapper and then assigning an actor to every line in
vtkPolyData? Or is there a better alternative to what I am doing now?

Thank you very much for your suggestions.

Andrea.

--
"Imagination Is The Only Weapon In The War Against Reality."

http://xoomer.virgilio.it/infinity77/