# Corona AO is bleeding on polygons

**URL:** <https://forums.chaos.com/t/corona-ao-is-bleeding-on-polygons/156631>\
**Category:** Help Required\
**Created:** [September 12, 2023, 6:50pm UTC](https://forums.chaos.com/t/corona-ao-is-bleeding-on-polygons/156631 "2023-09-12T18:50:40Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![cstephens0284](https://avatars.discourse-cdn.com/v4/letter/c/ee7513/32.png) [@cstephens0284](https://forums.chaos.com/u/cstephens0284)\
**Post date:** [September 12, 2023, 6:50pm UTC](https://forums.chaos.com/t/corona-ao-is-bleeding-on-polygons/156631/1 "2023-09-12T18:50:40Z")

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I am having problems setting the AO so that it only shows on the edges of object like this faucet. It wants to show up on polygons as well which then highlights the polygons. I have a noise map attached to the max distance at the moment I am guessing that is where the issues lie. Is there a better alternative? or am I just doing it all wrong?

 ![material on an object.PNG.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/2/e/2efc3f167b9ebb272b4e4724f290cc098af1fdfc.jpeg)  
 ![material setup.PNG](https://europe1.discourse-cdn.com/chaosprd/original/3X/f/a/fafd7bc59bcb128de57fd2e1c3c6f883961fe90b.png)  
 ![ao settings.PNG](https://europe1.discourse-cdn.com/chaosprd/original/3X/e/0/e06b94aa1a1efda0c73d558397f735bfd0e0a705.png)

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**Author:** ![romullus](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/romullus/32/271095_2.png) [@romullus](https://forums.chaos.com/u/romullus)\
**Post date:** [September 12, 2023, 7:20pm UTC](https://forums.chaos.com/t/corona-ao-is-bleeding-on-polygons/156631/2 "2023-09-12T19:20:34Z")

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Try to increase ray directionality, it should help with unwanted “spillage”. You may also want to decrease quality, too high value will only make your render slower, but will not produce any better result, although it has nothing to do with this specific issue.

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**Author:** ![AltoR](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/altor/32/33160_2.png) [@AltoR](https://forums.chaos.com/u/AltoR)\
**Post date:** [September 13, 2023, 12:23am UTC](https://forums.chaos.com/t/corona-ao-is-bleeding-on-polygons/156631/3 "2023-09-13T00:23:24Z")

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Or you could try using a CoronaCurvature map instead, it should work pretty well.

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**Author:** ![cstephens0284](https://avatars.discourse-cdn.com/v4/letter/c/ee7513/32.png) [@cstephens0284](https://forums.chaos.com/u/cstephens0284)\
**Post date:** [September 13, 2023, 11:08am UTC](https://forums.chaos.com/t/corona-ao-is-bleeding-on-polygons/156631/4 "2023-09-13T11:08:49Z")

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Thank you! the Curvature map worked super well, once i honed in the colors!

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**Author:** ![AltoR](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/altor/32/33160_2.png) [@AltoR](https://forums.chaos.com/u/AltoR)\
**Post date:** [September 13, 2023, 11:17am UTC](https://forums.chaos.com/t/corona-ao-is-bleeding-on-polygons/156631/5 "2023-09-13T11:17:05Z")

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Glad I could help. I found AO to be sometimes tricky to deal with.

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**Author:** ![Nymphetamine\_cg](https://avatars.discourse-cdn.com/v4/letter/n/a4c791/32.png) [@Nymphetamine\_cg](https://forums.chaos.com/u/Nymphetamine_cg)\
**Post date:** [September 14, 2023, 3:27pm UTC](https://forums.chaos.com/t/corona-ao-is-bleeding-on-polygons/156631/6 "2023-09-14T15:27:13Z")

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> [@cstephens0284](#):
>
> Thank you! the Curvature map worked super well, once i honed in the colors!

You are lucky. When I had the same problems, I could get the desired result with AO and Curvature Map…  
(the problem is described here: [[https://forum.corona-renderer.com/](https://forum.corona-renderer.com/) [Corona Curvature Map playground!](https://forums.chaos.com/t/152532) ]([https://forum.corona-renderer.com/](https://forum.corona-renderer.com/) [Corona Curvature Map playground!](https://forums.chaos.com/t/152532) ) **Reply#48** )