# Query fraction of rendered pixels

**URL:** https://discourse.vtk.org/t/query-fraction-of-rendered-pixels/3228
**Category:** Support
**Created:** [May 6, 2020, 6:51pm UTC](https://discourse.vtk.org/t/query-fraction-of-rendered-pixels/3228 "2020-05-06T18:51:26Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![woodscn](https://discourse.vtk.org/user_avatar/discourse.vtk.org/woodscn/32/1738_2.png) [@woodscn](https://discourse.vtk.org/u/woodscn)
#### Post date: [May 6, 2020, 6:51pm UTC](https://discourse.vtk.org/t/query-fraction-of-rendered-pixels/3228/1 "2020-05-06T18:51:26Z")

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I’m fairly new to VTK, so I apologize if this is already answered somewhere.

I’m rendering a large point cloud, and I quickly saturate the screen as the data size increases. I’d like to algorithmically describe this saturation, so I can look at ways to control it. Is there a way to query the render window to determine the total fraction of rendered points? I’d further prefer to handle this at the level of individual actors; is that possible?