# Cant color by scalars after warpscalar filter merge
**URL:** https://discourse.vtk.org/t/cant-color-by-scalars-after-warpscalar-filter-merge/6328
**Category:** Support
**Created:** [August 8, 2021, 1:51pm UTC](https://discourse.vtk.org/t/cant-color-by-scalars-after-warpscalar-filter-merge/6328 "2021-08-08T13:51:12Z")
**Posts on this page:** 1
**Page:** 1
### Author:  [@aivamyko](https://discourse.vtk.org/u/aivamyko)
#### Post date: [August 8, 2021, 1:51pm UTC](https://discourse.vtk.org/t/cant-color-by-scalars-after-warpscalar-filter-merge/6328/1 "2021-08-08T13:51:12Z")
Hello, i’ve been trying to color my object the same as i done it in paraview (image below), but after i used merge ColorByArrayComponent doesnt seem to work anymore. Can someone help ? I think i need to use color on warpscalar filter itself but i dont know how.
vtkDataSetReader\*read = vtkDataSetReader::New();
read-\>SetFileName(“C:\Users\aivam\Desktop\ubgrid.vtk”);
read-\>Update();
```
vtkNew warp;
warp->SetInputConnection(read->GetOutputPort());
warp->SetInputArrayToProcess(vtkDataSetAttributes::SCALARS, 0, 0, vtkDataObject::FIELD_ASSOCIATION_POINTS, "group/Scalar2");
warp->Update();
vtkMergeFilter*merge = vtkMergeFilter::New();
merge->SetGeometryInputData(warp->GetOutput());
merge->SetScalarsData(read->GetOutput());
vtkDataSetMapper*mapper = vtkDataSetMapper::New();
mapper->SetInputConnection(merge->GetOutputPort());
mapper->SetColorModeToMapScalars();
mapper->ScalarVisibilityOn();
mapper->SetScalarModeToUseFieldData();
mapper->SelectColorArray("group/Scalar1");
mapper->ColorByArrayComponent("group/Scalar1", 1);
mapper->ImmediateModeRenderingOff();
vtkActor*actor = vtkActor::New();
actor->SetMapper(mapper);
```
