# Blur skybox
**URL:** https://discourse.vtk.org/t/blur-skybox/3783
**Category:** Development
**Created:** [July 16, 2020, 2:20am UTC](https://discourse.vtk.org/t/blur-skybox/3783 "2020-07-16T02:20:56Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@kaiwen](https://discourse.vtk.org/u/kaiwen)
#### Post date: [July 16, 2020, 2:20am UTC](https://discourse.vtk.org/t/blur-skybox/3783/1 "2020-07-16T02:20:56Z")
I want to know how to blur the skybox.
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### Author:  [@Michael](https://discourse.vtk.org/u/Michael)
#### Post date: [July 16, 2020, 7:37am UTC](https://discourse.vtk.org/t/blur-skybox/3783/2 "2020-07-16T07:37:57Z")
We have implemented a Bokeh blur in [F3D](https://gitlab.kitware.com/f3d/f3d): [https://gitlab.kitware.com/f3d/f3d/-/blob/master/src/vtkF3DRenderPass.cxx#L235](https://gitlab.kitware.com/f3d/f3d/-/blob/master/src/vtkF3DRenderPass.cxx#L235)
This is a great way to emphasize the dataset and this should be moved to VTK at some point.
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### Author:  [@kaiwen](https://discourse.vtk.org/u/kaiwen)
#### Post date: [July 16, 2020, 1:53pm UTC](https://discourse.vtk.org/t/blur-skybox/3783/3 "2020-07-16T13:53:37Z")
I test it, is blur the background, but is too slow.
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### Author:  [@Michael](https://discourse.vtk.org/u/Michael)
#### Post date: [July 16, 2020, 1:55pm UTC](https://discourse.vtk.org/t/blur-skybox/3783/4 "2020-07-16T13:55:08Z")
You can reduce the number of samples.