# 'vtkScalarBarActor' show error with vtkGenericOpenGLRenderWindow

**URL:** https://discourse.vtk.org/t/vtkscalarbaractor-show-error-with-vtkgenericopenglrenderwindow/10083
**Category:** Support
**Created:** [December 6, 2022, 8:16am UTC](https://discourse.vtk.org/t/vtkscalarbaractor-show-error-with-vtkgenericopenglrenderwindow/10083 "2022-12-06T08:16:53Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![domusonway](https://discourse.vtk.org/user_avatar/discourse.vtk.org/domusonway/32/6137_2.png) [@domusonway](https://discourse.vtk.org/u/domusonway)
#### Post date: [December 6, 2022, 8:16am UTC](https://discourse.vtk.org/t/vtkscalarbaractor-show-error-with-vtkgenericopenglrenderwindow/10083/1 "2022-12-06T08:16:53Z")

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I want to add vtkScalarBarActor in vtk widget under qt , but I have a problem. When using vtkGenericOpenGLRenderWindow, the displayed color bar has no color, and the label is normal. But if I switch vtkGenericOpenGLRenderWindow to vtkRenderWindow, everything is normal, but now I have to Use vtkGenericOpenGLRenderWindow, does anyone know why this is the case? Is it because vtkGenericOpenGLRenderWindow is any different from vtkRenderWindow?

 ![2022-12-06 16-13-08 的屏幕截图](https://discourse.vtk.org/uploads/default/original/2X/5/52adc73e1be33c9d78338e8c08db25dc42429e04.png)  
 ![2022-12-06 16-12-46 的屏幕截图](https://discourse.vtk.org/uploads/default/original/2X/7/74316798ec10b2577ec0408d0d2c5f5a68c7b509.png)