Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: Neil Cross on 2019-11-22, 12:12:48

Title: Corona AO Issue
Post by: Neil Cross on 2019-11-22, 12:12:48

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.

(https://i.ibb.co/R3rW343/test1.jpg)
(https://i.ibb.co/fQrZpQH/test2.jpg)

Cheers
Neil

Title: Re: Corona AO Issue
Post by: pokoy on 2019-11-22, 21:35:37

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 Once that is available, AO inside mode is obsolete.

Title: Re: Corona AO Issue
Post by: GeorgeK on 2019-11-27, 10:44:39

I am getting the same result in both versions, are you using the 3ds max chamfer modifier?

Title: Re: Corona AO Issue
Post by: Neil Cross on 2019-11-27, 14:56:17

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.

Title: Re: Corona AO Issue
Post by: GeorgeK on 2019-11-27, 15:00:52

Quote from: Neil Cross on 2019-11-27, 14:56:17

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?

Title: Re: Corona AO Issue
Post by: maru on 2019-12-18, 13:47:30

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.

Title: Re: Corona AO Issue
Post by: sprayer on 2019-12-22, 09:01:44

In v4 it was the same but why it should work like this?

(https://i.imgur.com/mc3Egeh.jpg)
(https://i.imgur.com/waZkzCe.jpg)

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/index.php?topic=26707.0
here similar topic

I think it start work like this from v2

vray for comparison
(https://i.imgur.com/SCTSkNl.jpg)

Title: Re: Corona AO Issue
Post by: Naxos on 2019-12-28, 13:26:02

Same here, so i +1 this topic.

Title: Re: Corona AO Issue
Post by: hrb on 2020-04-08, 21:40:34

+1 on this topic ... did anybody find an answer to that problem ?

Title: Re: Corona AO Issue
Post by: hrb on 2021-08-18, 19:03:01

Any news on that guys ??

Title: Re: Corona AO Issue
Post by: TomG on 2021-08-18, 20:13:32

(I will leave the answer to the developers - I just wanted to drop in and say thanks for attending the webinar :) )

Title: Re: Corona AO Issue
Post by: GeorgeK on 2021-08-19, 15:01:20

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)