[vtkusers] Too many actors

[David.Pont at ForestResearch.co.nz]

Hi,
  you are right, too many actors.
Make just one mapper and one actor.
The 'basic' way to visualise vector fields is to specify points, then to
specify a vector at each point, then use vtkGlyph3D and pass to your
mapper, actor. There are many techniques for visualising vector fields
(vtkHedgehog, vtkStreamline...) see for example thrshldV.tcl, streamV.tcl
If you really want to specify the lines yourself create one vtkPolyData and
add points and cells (your lines) to it and pass to your mapper, actor.
If you really have a need for using vtkLineSource use vtkAppendPolyData to
collect all lines into a single polydata and pass to your mapper, actor.

 regards
     Dave P



                                                                                                               
                      "Yi-Yu Chou"                                                                             
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                      12/02/2004 04:50                                                                         
                                                                                                               
                                                                                                               




Dear all,

I want to use line segments to represent a 3D vector field. However, I got
a "lagging" problem
when displaying this vector field, if the number of line segments is huge.
I think it's because of using too many actors. If there any better method
to do it ? Any suggestion will be appreciated.
Below is my code :

line = []
line_mapper = []
line_actor = []
for i in range(0, vf_points.num):
             line.append(vtkLineSource())

line[i].SetPoint1(vf_points.x[i],vf_points.y[i],vf_points.z[i])
             line[i].SetPoint2(vf_points.x[i] + vf.vx[i],vf_points.y[i] +
vf.vy[i],vf_points.z[i] + vf.vz[i])
             line_mapper.append(vtkPolyDataMapper())
             line_mapper[i].SetInput(line[i].GetOutput())
             line_actor.append(vtkActor())
             line_actor[i].SetMapper(line_mapper[i])
             tar_renderer.AddActor(line_actor[i])

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