# OSPray pathtracer: erratic walls

**URL:** https://discourse.paraview.org/t/ospray-pathtracer-erratic-walls/7966
**Category:** ParaView Support
**Created:** [September 9, 2021, 4:41pm UTC](https://discourse.paraview.org/t/ospray-pathtracer-erratic-walls/7966 "2021-09-09T16:41:42Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![bastian](https://discourse.paraview.org/user_avatar/discourse.paraview.org/bastian/32/7513_2.png) [@bastian](https://discourse.paraview.org/u/bastian)
#### Post date: [October 5, 2021, 4:48pm UTC](https://discourse.paraview.org/t/ospray-pathtracer-erratic-walls/7966/4 "2021-10-05T16:48:33Z")

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I was a bit fast at deleting the unwanted images, but here is one example:

 ![1076](https://discourse.paraview.org/uploads/default/original/2X/4/4db8050d58717c986e187970c857ea720d1e6774.jpeg)

I think that one corner is always at the origin (0,0,0).

This looks like the same issue to me:

> [@background error in raytracing](https://discourse.paraview.org/t/background-error-in-raytracing/7898):
>
> With paraview 5.9.1, I have a problem where the bundled ospray. Rendered images contain random errors where a large region of grey color may appear in the saved snapshot image. One such image is attached as an example. I was using ospray path tracer and backplate. Normal images have clear white background, but in a long sequence of rendering, some images may randomly contain these grey errors. Some cases the grey area is large as the attached image, sometimes the grey area i…

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