Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: iLEZ on 2015-03-18, 09:00:36

Title: Displacement behaving interestingly
Post by: iLEZ on 2015-03-18, 09:00:36

I have a scene (NDA stuff, can't share, can try to replicate) of a huge seascape, a couple of km across. I have clouds over it, with a corona material as per the instructions in the excellent FAQ. These clouds are displaced with a cell map, between two and five meters. Now, when I change the size of the cell map, only just a little bit, the displacement seemingly goes away. How can this be?

Title: Re: Displacement behaving interestingly
Post by: maru on 2015-03-18, 09:24:22

Hi, does this happen in interactive rendering or in regular rendering too?

Title: Re: Displacement behaving interestingly
Post by: iLEZ on 2015-03-18, 10:15:20

Quote from: maru on 2015-03-18, 09:24:22

Hi, does this happen in interactive rendering or in regular rendering too?

I believe it is both. I'll see if I can replicate with pictures later today.

Title: Re: Displacement behaving interestingly
Post by: Ondra on 2015-03-23, 16:57:01

hi,
any progress? Does the polycount (shown in VFB side panel) also changes significantly after you tweak the texture?

Title: Re: Displacement behaving interestingly
Post by: Ondra on 2015-03-30, 23:27:31

Hi,
any progress here? If you cannot provide more info, I will have to close this report.

Title: Re: Displacement behaving interestingly
Post by: iLEZ on 2015-03-31, 10:11:45

Quote from: Ondra on 2015-03-30, 23:27:31

Hi,
any progress here? If you cannot provide more info, I will have to close this report.

Hi, sorry about not getting back to you, it has been a bit stressful. I'll try to recreate the scene right away. =)

Title: Re: Displacement behaving interestingly
Post by: iLEZ on 2015-03-31, 10:35:15

Quote from: Ondra on 2015-03-30, 23:27:31

Hi,
any progress here? If you cannot provide more info, I will have to close this report.

I'll attach a screenshot of how it looks like when I change the UV to 1x1 while in interactive mode. The displacement does not change.

Title: Re: Displacement behaving interestingly
Post by: iLEZ on 2015-03-31, 10:41:13

Interesingly, if I try with a cellular map on the exact same scene, the cell map simply displaces the mesh uniformly, not with the values from the cell map. Seems to be a specific thing with the cell map -> displacement. If I route the cell map to the RGB it looks fine.

Title: Re: Displacement behaving interestingly
Post by: maru on 2015-04-01, 15:11:22

Checked. I don't see anything suspicious here other than displacement not updating when changing map parameters in IR. That's why I asked if this happens in IR mode only. Because it works fine in regular rendering, right?

Title: Re: Displacement behaving interestingly
Post by: Ludvik Koutny on 2015-06-08, 16:50:59

Successfully reproduced and logged on mantis: https://corona-renderer.com/bugs/view.php?id=1075

Archiving to resolved section.