[vtkusers] Map scalar data to color?

[Mirelle Mellqvist]

Hello!
I am a newbie at VTK. I have made a vtk file (see below) and I have created 
a lookup table with some colors for every point. My problem is that I can't 
see any of the colors. Do any of you have any suggestions what to do? I have 
included my code below.

I have also tried to do this for every cell, but the biggest problem there 
was that the first element had the right color but the rest of my 24 
elements had the same colors as my last element. What caused that problem?

# vtk DataFile Version 4.2
Test data
ASCII

DATASET UNSTRUCTURED_GRID
POINTS 36 float
  0.0 -500.000 0.0
  0.0 -400.000 0.0
  0.0 -300.000 0.0
  0.0 -200.000 0.0
  0.0 -100.0 0.0
  0.0 0.0 0.0
  100.0 0.0 0.0
  200.0 0.0 0.0
  300.0 0.0 0.0
  400.0 0.0 0.0
  500.0 0.0 0.0
  500.0 -100.0 0.0
  500.0 -200.0 0.0
  500.0 -300.0 0.0
  500.0 -400.0 0.0
  500.0 -500.0 0.0
  400.0 -500.0 0.0
  300.0 -500.0 0.0
  200.0 -500.0 0.0
  100.0 -500.0 0.0
  400.0 -300.0 0.0
  300.0 -300.0 0.0
  200.0 -300.0 0.0
  100.0 -300.0 0.0
  100.0 -200.0 0.0
  200.0 -200.0 0.0
  100.0 -100.0 0.0
  200.0 -100.0 0.0
  300.0 -200.0 0.0
  300.0 -100.0 0.0
  400.0 -200.0 0.0
  400.0 -100.0 0.0
  100.0 -400.0 0.0
  200.0 -400.0 0.0
  300.0 -400.0 0.0
  400.0 -400.0 0.0

CELLS 25 125
4 2 3 24 23
4 3 4 26 24
4 22 23 24 25
4 21 22 25 28
4 25 24 26 27
4 4 5 6 26
4 28 25 27 29
4 6 7 27 26
4 20 21 28 30
4 12 13 20 30
4 7 8 29 27
4 29 31 30 28
4 8 9 31 29
4 11 12 30 31
4 9 10 11 31
4 19 0 1 32
4 18 19 32 33
4 2 23 32 1
4 17 18 33 34
4 23 22 33 32
4 22 21 34 33
4 16 17 34 35
4 14 15 16 35
4 21 20 35 34
4 20 13 14 35

CELL_TYPES 25
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

POINT_DATA 36
SCALARS my_scalars float 1
LOOKUP_TABLE my_table
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.0
31.0
32.0
33.0
34.0
35.0
LOOKUP_TABLE my_table 36
1.0 0.0 0.0 1.0
1.0 0.0 0.0 1.0
0.0 1.0 0.0 1.0
0.0 0.0 1.0 1.0
0.0 0.0 0.7 1.0
0.0 0.7 0.0 1.0
0.7 0.0 0.0 1.0
0.0 0.5 0.0 1.0
0.0 0.0 0.5 1.0
0.5 0.0 0.0 1.0
0.5 0.5 0.5 1.0
0.0 0.8 0.8 1.0
0.0 0.0 0.0 1.0
0.7 0.7 0.0 1.0
0.9 0.9 0.9 1.0
0.6 0.2 0.2 1.0
0.8 0.3 0.1 1.0
0.0 0.4 0.4 1.0
0.4 0.0 0.0 1.0
0.0 0.6 0.9 1.0
0.2 0.4 0.6 1.0
0.1 0.0 0.5 0.0
0.3 0.5 0.0 0.5
0.3 0.4 0.4 0.7
0.0 1.0 0.0 1.0
0.6 0.2 0.2 1.0
0.8 0.3 0.1 1.0
0.0 0.4 0.4 1.0
0.4 0.0 0.0 1.0
0.0 0.6 0.9 1.0
0.2 0.4 0.6 1.0
0.1 0.0 0.5 0.0
0.3 0.5 0.0 0.5
0.3 0.4 0.4 0.7
0.0 1.0 0.0 1.0
1.0 0.0 0.5 1.0

#include "vtkUnstructuredGridReader.h"
#include "vtkUnstructuredGrid.h"
#include "vtkWarpVector.h"
#include "vtkConnectivityFilter.h"
#include "vtkDataSetMapper.h"
#include "vtkActor.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkCamera.h"
#include "vtkGeometryFilter.h"
#include "vtkPolyData.h"
#include "vtkPolyDataMapper.h"
#include "vtkObject.h"
#include "vtkPointDataToCellData.h"
#include "vtkRenderWindowInteractor.h"

int main(){


	vtkUnstructuredGridReader *reader = vtkUnstructuredGridReader::New();
	 reader->SetFileName("filereader_20040906_v03.vtk");
	 //reader->SetVectorsName("vectors");
	 reader->SetScalarsName("my_scalars");
	 //reader->SetScalarsName("cell_scalars");

	 vtkPointData *pointData=vtkPointData::New();

	 vtkWarpVector *warp=vtkWarpVector::New();
		warp->SetInput(reader->GetOutput());

	vtkDataSetMapper *dataMapper=vtkDataSetMapper::New();
		dataMapper->SetInput(warp->GetOutput());

	vtkActor *actor=vtkActor::New();
		actor->SetMapper(dataMapper);

	vtkCamera *camera=vtkCamera::New();
		camera->SetFocalPoint(0,0,0);

	vtkRenderer *ren=vtkRenderer::New();
		ren->AddActor(actor);
		ren->SetBackground(1,1,1);
		ren->SetActiveCamera(camera);
		ren->ResetCamera();

	vtkRenderWindow *renWin=vtkRenderWindow::New();
		renWin->AddRenderer(ren);
		renWin->SetSize(1000,1000);

	vtkRenderWindowInteractor *iren=vtkRenderWindowInteractor::New();
		iren->SetRenderWindow(renWin);

	renWin->Render();
	iren->Start();
	reader->Delete();
	dataMapper->Delete();
	actor->Delete();
	ren->Delete();
	renWin->Delete();
	system("PAUSE");
	return 0;
}


Looking forward to hear from you!
Kind regards,
Mirelle

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