();
vtkActor actor = actors[actorIndex];
var output = actor.GetMapper().GetInputAsDataSet();
var cell = output.GetCellData();
for (int i = 0; i < cell.GetNumberOfArrays(); i++)
{
var colm = cell.GetArrayName(i);
var arr = cell.GetArray(i);
if (column == colm)
{
if (arr == null) return null;
return arr.GetRange(); // new double[] { min, max }
}
}
return null;
}
```
### ACTUAL OUTPUT for VTP and VTK (GOOD):
The result is fine. This is how drillholes are shown in by my code. [](https://i.stack.imgur.com/Gz0WL.png)
### EXPECTED OUTPUT for VTU (GOOD):
See how its colored. This is what PARAVIEW software can show: [](https://i.stack.imgur.com/6KxaP.png)
### ACTUAL OUTPUT for VTU (BAD):
This is how my code show that model: [](https://i.stack.imgur.com/6EWU0.png)
I also tried:
I tried following question, but vtu color has no effect. I tried cell data too instead of point data. I also tried lookup table, it do shows with color scalebar but has no effect on model color.
The strange things are that:
- all vtp files work (to color)and all vtu files fails
- vtu file show colorful fine on paraview, but not in my code
---
### Author:  [@Kenichiro-Yoshimi](https://discourse.paraview.org/u/Kenichiro-Yoshimi)
#### Post date: [August 15, 2022, 8:38am UTC](https://discourse.paraview.org/t/how-to-color-unstructured-grid-vtu/10140/2 "2022-08-15T08:38:38Z")
Hello,
I am not sure if this is a proper solution, but it might work if you create a new mapper at the end of the `setColors` function.
```auto
output.GetPointData().SetScalars(colors);
+ vtkDataSetMapper mapper = vtkDataSetMapper.New();
+ mapper.SetInput(output);
+ actor.SetMapper(mapper);
}
```
It may also be possible to draw the array directly instead of creating an RGB array. (The following was also added at the end of the `setColors` function.)
```auto
#output.GetPointData().SetScalars(colors);
+ var mapper = actor.GetMapper();
+ mapper.SelectColorArray(column);
+ mapper.SetScalarModeToUsePointFieldData();
+ var range1 = getRange(actorIndex, column);
+ mapper.SetScalarRange(range1[0], range1[1]);
}
```
I think your question will be better answered in the vtk forum ([https://discourse.vtk.org/](https://discourse.vtk.org/)) than in the ParaView forum.
---
### Author:  [@graysuit](https://discourse.paraview.org/u/graysuit)
#### Post date: [August 15, 2022, 1:39pm UTC](https://discourse.paraview.org/t/how-to-color-unstructured-grid-vtu/10140/3 "2022-08-15T13:39:37Z")
Wow. I been asking same question on sereval forums, even on discourse vtk. Its been 2-3 month. But only you got real solution.
Didn’t expected, solution would that simple.
Your first code works. Here’s output I got:
However, I’m seeing an warning in vtk unmanaged libraries:
```auto
Warning: In ..\..\..\..\vtksource-prefix\src\vtksource\Filtering\vtkDataSet.cxx, line 413
vtkUnstructuredGrid (0F089B08): Point array Colors with 3 components, has 257902 tuples but there are only 256756 points
```
So from last line, I think problem is, my color array has 257902 values whereas total points inside model was 256756.
I investigated and noted several meaningful integers:
```auto
output.GetMaximumNumberOfPieces(); // 1
output.GetNumberOfCells(); // 231659
output.GetNumberOfPoints(); // 256756 IMPORTANT
cell.GetNumberOfArrays(); // 10
cell.GetNumberOfTuples(); // 231659
cell.GetNumberOfComponents(); // 10
cells.GetNumberOfComponents(); // 1
cells.GetNumberOfTuples(); // 231659
cells.GetNumberOfComponentsMaxValue(); // 2147483647
cells.GetNumberOfComponentsMinValue(); // 0
```
So I replaced this code:
```auto
colors.InsertNextTuple3((double)R, (double)G, (double)B);
colors.InsertNextTuple3((double)R, (double)G, (double)B);
```
with
```auto
if (colors.GetNumberOfTuples() >= output.GetNumberOfPoints())
{
break;
}
else colors.InsertNextTuple3((double)R, (double)G, (double)B);
if (colors.GetNumberOfTuples() >= output.GetNumberOfPoints())
{
break;
}
else colors.InsertNextTuple3((double)R, (double)G, (double)B);
```
It do colors as well and also warning doesn’t appears.
But another error appears. I can’t able to copy whole error, as it remain freezed.
I believe there’s tiny mistake I may be doing.
For second code, unfortunately has no effect.
---
### Author:  [@graysuit](https://discourse.paraview.org/u/graysuit)
#### Post date: [August 15, 2022, 2:12pm UTC](https://discourse.paraview.org/t/how-to-color-unstructured-grid-vtu/10140/4 "2022-08-15T14:12:31Z")
So I catch that error using
```auto
vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
renderWindow.ErrorEvt += vtk_error;
void vtk_error(vtkObject sender, vtkObjectEventArgs e)
{
string s = "unknown";
if (e.CallData != IntPtr.Zero)
{
s = System.Runtime.InteropServices.Marshal.PtrToStringAnsi(e.CallData);
}
Console.Write(string.Format("Error: sender='{0}' e='{1}' s='{2}'", sender, e, s));
}
```
Here’s full error log:
```auto
Error: sender='vtkWin32OpenGLRenderWindow (0C63D900)
Debug: Off
Modified Time: 6522
Reference Count: 2
Registered Events:
Registered Observers:
vtkObserver (0C6516F0)
Event: 40
EventName: WarningEvent
Command: 0C651A50
Priority: 0
Tag: 2
vtkObserver (0C63BE50)
Event: 39
EventName: ErrorEvent
Command: 0C642FF8
Priority: 0
Tag: 1
Erase: On
Window Name: Visualization Toolkit - Win32OpenGL #1
Position: (0, 0)
Size: (595, 421)
Mapped: 1
OffScreenRendering: 0
Double Buffered: 1
DPI: 96
TileScale: (1, 1)
TileViewport: (0, 0, 1, 1)
Borders: On
IsPicking: Off
Double Buffer: On
Full Screen: Off
Renderers:
Debug: Off
Modified Time: 1002
Reference Count: 1
Registered Events: (none)
Number Of Items: 1
Stereo Capable Window Requested: No
Stereo Render: Off
Point Smoothing: Off
Line Smoothing: Off
Polygon Smoothing: Off
Anti Aliased Frames: 0
Abort Render: 0
Current Cursor: 0
Desired Update Rate: 0.0001
Focal Depth Frames: 0
In Abort Check: 0
NeverRendered: 0
Interactor: 0C63E368
Motion Blur Frames: 0
Swap Buffers: On
Stereo Type: CrystalEyes
Number of Layers: 1
AccumulationBuffer Size 0
AlphaBitPlanes: Off
AnaglyphColorSaturation: 0.65
AnaglyphColorMask: 4 , 3
PainterDeviceAdapter:
Debug: Off
Modified Time: 32
Reference Count: 1
Registered Events: (none)
MultiSamples: 8
StencilCapable: False
ReportGraphicErrors: Off
ContextId: 00010000
Next Window Id: 00000000
Window Id: 000B020A
' e='Kitware.VTK.vtkObjectEventArgs' s='ERROR: In ..\..\..\..\vtksource-prefix\src\vtksource\Rendering\vtkWin32OpenGLRenderWindow.cxx, line 247
vtkWin32OpenGLRenderWindow (0C63D900): wglMakeCurrent failed in MakeCurrent(), error: The requested resource is in use.
'
```
---
### Author:  [@graysuit](https://discourse.paraview.org/u/graysuit)
#### Post date: [August 16, 2022, 6:49am UTC](https://discourse.paraview.org/t/how-to-color-unstructured-grid-vtu/10140/5 "2022-08-16T06:49:15Z")
I want to accept your answer as solution. But not sure how I can do it, because there’s no solution button visible.
Also previously, I bountied on stack overflow. So go, also write your answer there as well and get bounty.
>
Although bounty is small worth 50 only, but at least it meant to show achievement that rarely anyone can get.
---
### Author:  [@Kenichiro-Yoshimi](https://discourse.paraview.org/u/Kenichiro-Yoshimi)
#### Post date: [August 16, 2022, 7:53am UTC](https://discourse.paraview.org/t/how-to-color-unstructured-grid-vtu/10140/6 "2022-08-16T07:53:40Z")
Thank you, I wrote the same answer as here on stack overflow.
---
### Author:  [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [August 16, 2022, 9:16pm UTC](https://discourse.paraview.org/t/how-to-color-unstructured-grid-vtu/10140/7 "2022-08-16T21:16:57Z")
> [@graysuit](#):
>
> But not sure how I can do it, because there’s no solution button visible.
Thanks for pointing this out. It should be fixed now.