# Corona AO Issue **URL:** \ **Category:** Issues\ **Created:** [November 22, 2019, 11:12am UTC](https://forums.chaos.com/t/corona-ao-issue/145858 "2019-11-22T11:12:48Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![neilcross](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/neilcross/32/235247_2.png) [@neilcross](https://forums.chaos.com/u/neilcross)\ **Post date:** [November 22, 2019, 11:12am UTC](https://forums.chaos.com/t/corona-ao-issue/145858/1 "2019-11-22T11:12:48Z")
Hello, Im not sure if this is a bug in Corona 5 but the AO map seems to be acting strange compared to Corona 4. By default, the OA is picking up wireframe edges. Setting the Ray Directionaly to 1 seems to fix this but then the max distance seems incorrect in relation to the object scale. I hope this makes sense. ![test1.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/8/0/809c4b74d131f9ec4fc014d0d0a3acf49e7a66fd.jpeg) ![test2.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/0/a/0ab77be77ec9c7c022deba7adc0cbed1766742cb.jpeg) Cheers Neil ---
**Author:** ![pokoy\_1](https://avatars.discourse-cdn.com/v4/letter/p/ebca7d/32.png) [@pokoy\_1](https://forums.chaos.com/u/pokoy_1)\ **Post date:** [November 22, 2019, 8:35pm UTC](https://forums.chaos.com/t/corona-ao-issue/145858/2 "2019-11-22T20:35:37Z")
A comparison with v4 would be useful, but the inside mode was extremely sensitive before either way. Not saying it’s not a bug in v5 but I guess it’s time for the curvature map to materialise. Once that is available, AO inside mode is obsolete. ---
**Author:** ![Corona\_GK](https://avatars.discourse-cdn.com/v4/letter/c/c6cbf5/32.png) [@Corona\_GK](https://forums.chaos.com/u/Corona_GK)\ **Post date:** [November 27, 2019, 9:44am UTC](https://forums.chaos.com/t/corona-ao-issue/145858/3 "2019-11-27T09:44:39Z")
I am getting the same result in both versions, are you using the 3ds max chamfer modifier? ![Screenshot_5.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/3/5/35c243eb1cdce7fb26430ddc85e47a74ab141904.jpeg) ![Screenshot_11.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/9/5/950ddb564a0e7e5ab955c32264f4ada5847e1d9f.jpeg) ---
**Author:** ![neilcross](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/neilcross/32/235247_2.png) [@neilcross](https://forums.chaos.com/u/neilcross)\ **Post date:** [November 27, 2019, 1:56pm UTC](https://forums.chaos.com/t/corona-ao-issue/145858/4 "2019-11-27T13:56:17Z")
Not using any chamfer. Strange you getting the same result in Corona4. Maybe it’s just me. Although the AO does feel more sensitive. Attached Iv made a few more shapes. ![test3.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/4/1/414fe1a76867405edd5e09d0ff5160526bf7c25e.jpeg) ---
**Author:** ![Corona\_GK](https://avatars.discourse-cdn.com/v4/letter/c/c6cbf5/32.png) [@Corona\_GK](https://forums.chaos.com/u/Corona_GK)\ **Post date:** [November 27, 2019, 2:00pm UTC](https://forums.chaos.com/t/corona-ao-issue/145858/5 "2019-11-27T14:00:52Z")
> [@Neil Cross](#): > > Not using any chamfer. Strange you getting the same result in Corona4. Maybe it’s just me. > > Although the AO does feel more sensitive. Attached Iv made a few more shapes. I am suspecting 3ds max System Unit setup, what setup you are using. My tests were done in 3dsmax 2020 and 2019, with V5 and V4 respectively. I did use exactly the same settings with 5mm distance. Can you please provide your test scene? ---
**Author:** ![maru](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/maru/32/15975_2.png) [@maru](https://forums.chaos.com/u/maru)\ **Post date:** [December 18, 2019, 12:47pm UTC](https://forums.chaos.com/t/corona-ao-issue/145858/6 "2019-12-18T12:47:30Z")
I don’t think anything was changed with AO or how it’s evaluated between V4 and V5, so I am moving this to resolved. If anyone has some similar findings, please share them here and we will move it back for investigation. ---
**Author:** ![sprayer\_1](https://avatars.discourse-cdn.com/v4/letter/s/5fc32e/32.png) [@sprayer\_1](https://forums.chaos.com/u/sprayer_1)\ **Post date:** [December 22, 2019, 8:01am UTC](https://forums.chaos.com/t/corona-ao-issue/145858/7 "2019-12-22T08:01:44Z")
In v4 it was the same but why it should work like this? ![mc3Egeh.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/6/0/60faea41da767cbf9c08ba70d34b6ea6751ab8f2.jpeg) ![waZkzCe.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/5/a/5a44f53e2345aa1f65a27b829bf9ab25e9d041ea.jpeg) why it works on wire mesh, for example if we want lines only on hard edges both inside and outside, round edge bump works better than AO why? [https://forum.corona-renderer.com/](https://forum.corona-renderer.com/) [corona AO map shows on curves](https://forums.chaos.com/t/145654) here similar topic I think it start work like this from v2 vray for comparison ![SCTSkNl.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/6/a/6a1b981ae41bf96d36fdca806c32605809b8687f.jpeg) ---
**Author:** ![claudio\_gallego](https://avatars.discourse-cdn.com/v4/letter/c/bcef8e/32.png) [@claudio\_gallego](https://forums.chaos.com/u/claudio_gallego)\ **Post date:** [December 28, 2019, 12:26pm UTC](https://forums.chaos.com/t/corona-ao-issue/145858/8 "2019-12-28T12:26:02Z")
Same here, so i +1 this topic. ---
**Author:** ![Hugon](https://avatars.discourse-cdn.com/v4/letter/h/f0a364/32.png) [@Hugon](https://forums.chaos.com/u/Hugon)\ **Post date:** [April 8, 2020, 7:40pm UTC](https://forums.chaos.com/t/corona-ao-issue/145858/9 "2020-04-08T19:40:34Z")
+1 on this topic … did anybody find an answer to that problem ? ---
**Author:** ![Hugon](https://avatars.discourse-cdn.com/v4/letter/h/f0a364/32.png) [@Hugon](https://forums.chaos.com/u/Hugon)\ **Post date:** [August 18, 2021, 5:03pm UTC](https://forums.chaos.com/t/corona-ao-issue/145858/10 "2021-08-18T17:03:01Z")
Any news on that guys ?? ---
**Author:** ![tom\_grimes](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/tom_grimes/32/52842_2.png) [@tom\_grimes](https://forums.chaos.com/u/tom_grimes)\ **Post date:** [August 18, 2021, 6:13pm UTC](https://forums.chaos.com/t/corona-ao-issue/145858/11 "2021-08-18T18:13:32Z")
(I will leave the answer to the developers - I just wanted to drop in and say thanks for attending the webinar 😃 ) ---
**Author:** ![Corona\_GK](https://avatars.discourse-cdn.com/v4/letter/c/c6cbf5/32.png) [@Corona\_GK](https://forums.chaos.com/u/Corona_GK)\ **Post date:** [August 19, 2021, 1:01pm UTC](https://forums.chaos.com/t/corona-ao-issue/145858/12 "2021-08-19T13:01:20Z")
Hi everyone, I fail to see how ray directionality won’t work in this case, indeed the edge occlusion becomes somewhat less strong but it can still be controlled through max distance and by not maxing ray directionality to 1.0, internal edges will be invisible at 0.5. Regardless, I am reporting it for further consideration, please stay tuned. (Report ID=CRMAX-914) ![ao_corona.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/b/4/b438b205f1de73d8070db06fdb84edd9e3c80f71.jpeg)