[vtkusers] Colour

[Immo Trinks]

Hi Donald,

The following tcl script does the job for the data file given below.
The colours are defined  as RGB values

Immo

##########################################
# load the necessary VTK libraries.
package require vtk
package require vtkinteraction
package require vtktesting

vtkPolyDataReader reader
reader SetFileName "test.vtk"

vtkPolyDataMapper mapper
mapper SetInput [reader GetOutput]
mapper SelectColorArray "colour"

vtkActor Points
Points SetMapper mapper
Points SetScale 1 1 1
[Points GetProperty] SetPointSize  10
Points SetPosition 0 0 0
Points SetScale 1 1 1
[Points GetProperty] SetOpacity 1
[Points GetProperty] SetColor 1 1 1
mapper SetScalarMode 3
[Points GetProperty] SetRepresentationToPoints

vtkRenderer ren1
ren1 AddActor2D Points
ren1 SetBackground 1 1 1

vtkRenderWindow renWin 
renWin AddRenderer ren1
renWin SetSize 700 700

vtkRenderWindowInteractor iren 
iren SetRenderWindow renWin 

vtkCamera cam1
cam1 Elevation 90
cam1 SetFocalPoint -15.48  16.44  -0.50
cam1 SetViewUp 0 0 1
cam1 SetPosition -20 20 0
ren1 SetActiveCamera cam1
ren1 ResetCamera

iren Initialize 
########################################

Test-file "test.vtk" with 4 points:

# vtk DataFile Version 3.0
####
ASCII
DATASET POLYDATA

POINTS 4 float
 0.0  0.0  0.0
 1.0  0.0  0.0
 0.0  1.0  0.0
 0.0  1.0  1.0

POLYGONS 1 5
4 0 1 2 3

POINT_DATA 4
VECTORS colour unsigned_char
 255  0  0
 0  255  0
 0   0 255
 255   0 255



On Wednesday 30 Jun 2004 16:20, Hamp Donald wrote:
> Hi
>      I have  a set of points and the points are stored
> in vtkPolyData. Depending uon the condition, can I
> change the coloor of some of the vertices with a
> different color.
>
> Hope you will respond.
>
> Best Regards
> Subhas
>
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