# unable to set colormap range correctly (MWE)
**URL:** https://discourse.vtk.org/t/unable-to-set-colormap-range-correctly-mwe/8412
**Category:** Web
**Created:** [May 2, 2022, 9:51am UTC](https://discourse.vtk.org/t/unable-to-set-colormap-range-correctly-mwe/8412 "2022-05-02T09:51:44Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@eudoxos](https://discourse.vtk.org/u/eudoxos)
#### Post date: [May 2, 2022, 9:51am UTC](https://discourse.vtk.org/t/unable-to-set-colormap-range-correctly-mwe/8412/1 "2022-05-02T09:51:44Z")
I have the following MWE where I try to set colormap and colormap range on a simple .vtp file; the point data scalar is the function curvature. I am able to set the colormap to “Cool to Warm” with vtk.js but I can’t seem to set the range for the colormap directly:
For comparison, the following screenshot is from Paraview which correctly shows the desired -0.1 … 0.1 range:
Is there something obvious I am ignoring?
This is the MWE webpage :
```javascript
```
and the `.05-test-grid.vtp` file was generated via PyVista as
```python
import numpy as np
import pyvista as pv
from pyvista import examples
x = np.arange(-10, 10, 0.25)
y = np.arange(-10, 10, 0.25)
x, y = np.meshgrid(x, y)
r = np.sqrt(x **2 + y** 2)
z = np.sin(r)
grid = pv.StructuredGrid(x, y, z)
surf=grid.cast_to_unstructured_grid().extract_surface()
surf.point_data['curvature']=surf.curvature()
surf.save('05-test-grid.vtp')
```
---
### Author:  [@Sebastien\_Jourdain](https://discourse.vtk.org/u/Sebastien_Jourdain)
#### Post date: [May 2, 2022, 11:51pm UTC](https://discourse.vtk.org/t/unable-to-set-colormap-range-correctly-mwe/8412/2 "2022-05-02T23:51:16Z")
I think you are missing [that setting](https://github.com/Kitware/vtk-js/blob/master/Examples/Applications/GeometryViewer/index.js#L228).
---
### Author:  [@eudoxos](https://discourse.vtk.org/u/eudoxos)
#### Post date: [May 3, 2022, 5:35am UTC](https://discourse.vtk.org/t/unable-to-set-colormap-range-correctly-mwe/8412/3 "2022-05-03T05:35:35Z")
Thanks for the hint. It was the `vtkMapper.newInstance({useLookupTableScalarRange:true})` and also that `setMappingRange` must be called **after** `applyColorMap(cmap)`. This is working now:
```auto
```
