# Render Region discrepancy

**URL:** <https://forums.chaos.com/t/render-region-discrepancy/51465>\
**Category:** Issues\
**Created:** [October 23, 2014, 3:47am UTC](https://forums.chaos.com/t/render-region-discrepancy/51465 "2014-10-23T03:47:14Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![snivlem](https://avatars.discourse-cdn.com/v4/letter/s/e99b99/32.png) [@snivlem](https://forums.chaos.com/u/snivlem)\
**Post date:** [October 23, 2014, 3:47am UTC](https://forums.chaos.com/t/render-region-discrepancy/51465/1 "2014-10-23T03:47:14Z")

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Hi,

I have a scene where there are some discrepancies involved when doing a render region.

Between these two renders, no setting or change has been made to the scene. However the difference is quite significant.

For lighting, the scene is using sun + sky, there are also about 20 artificial lights that are vray area lights at a sample rate of 64.  
Portal lights are used to help the sky illumination.

I’m using Medium irradiance preset (60 subdivs, 30 interp samples, enhance details on) and a light cache of 1000 (world sample 20, adaptive sampling).

Are there any more settings I can think about to improve the consistency between render regions?

[2014/Oct/23|14:03:20] V-Ray: V-Ray for Maya version 2.45.01, revision 24870 from Aug 22 2014, 08:12:05  
[2014/Oct/23|14:03:20] V-Ray: V-Ray core version is 2.55.01  
2015Ext1SP2

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**Author:** ![t.petrov](https://avatars.discourse-cdn.com/v4/letter/t/c68b51/32.png) [@t.petrov](https://forums.chaos.com/u/t.petrov)\
**Post date:** [October 23, 2014, 3:17pm UTC](https://forums.chaos.com/t/render-region-discrepancy/51465/2 "2014-10-23T15:17:28Z")

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Hm, the attachments seems to be broken.

What OS are you using?  
Are you using DR?

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**Author:** ![snivlem](https://avatars.discourse-cdn.com/v4/letter/s/e99b99/32.png) [@snivlem](https://forums.chaos.com/u/snivlem)\
**Post date:** [October 24, 2014, 1:47am UTC](https://forums.chaos.com/t/render-region-discrepancy/51465/3 "2014-10-24T01:47:41Z")

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Sorry petrov, when I posted the attachments showed up in Chrome.

Win7 and it happened with both DR and no DR.

I think I found the solution though, after a few hours of testing it seems the culprit was an infinite plane causing GI issues. Even though it was 7cm below the floor here, V-Ray got confused. Strange reflections throughout the scene also seemed to disappear when I deleted the infinite plane.

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**Author:** ![t.petrov](https://avatars.discourse-cdn.com/v4/letter/t/c68b51/32.png) [@t.petrov](https://forums.chaos.com/u/t.petrov)\
**Post date:** [October 24, 2014, 9:55am UTC](https://forums.chaos.com/t/render-region-discrepancy/51465/4 "2014-10-24T09:55:06Z")

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Glad you’ve found the problem.