Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => Topic started by: Billabong on 2023-07-18, 21:07:03

Title: Corona Decals are affecting lighting
Post by: Billabong on 2023-07-18, 21:07:03

I work in product viz and we have a lot of decals we place on certain products. Everything from logos to labels. I have 14 on the one I'm working on now. Our method of working is to put an alpha map of the decal in the opacity slot of a material and use  "From material" on the Corona Decal.

 We have to render these products twice. One with the decals on and one with them off. What I have been noticing is that when I turn the decal layers on, the lighting changes, usually it will brighten the scene.
 
  Has this happened with anyone else? We are using Corona 8 at the moment. I would like to post a scene or screenshots for reference, but unfortunately I can't (NDA)
 Thanks for feedback and or help.

Title: Re: Corona Decals are affecting lighting
Post by: romullus on 2023-07-18, 23:00:01

Depending on the size and colour of decals they might quite significantly affect scene lighting, so some difference might be expected. It's hard to say something more specific without seeing examples.

Title: Re: Corona Decals are affecting lighting
Post by: Billabong on 2023-07-19, 17:09:02

I remodeled the product with with just boxes and cylinders and was able to recreate the problem. Notice when I turn the decals off how much brighter the light in front got.

Title: Re: Corona Decals are affecting lighting
Post by: romullus on 2023-07-19, 19:17:23

Wild guess - is it possible that one or few decal objects are intersecting with some of the scene lights? Maybe you can attach this simplified scene to the forum, or send it to Corona support team through support ticket, so someone could take a look at it. https://support.chaos.com/hc/en-us/requests/new

Title: Re: Corona Decals are affecting lighting
Post by: Billabong on 2023-07-19, 20:30:34

Lights are no where near the any objects. I submitted a ticket. Whatever the outcome, Ill post back what it is, incase anyone else has the same issue.

Title: Re: Corona Decals are affecting lighting
Post by: Frood on 2023-07-20, 09:06:30

Quote from: Billabong on 2023-07-19, 20:30:34

Whatever the outcome, Ill post back what it is, incase anyone else has the same issue.

Thanks for this!


Good Luck

Title: Re: Corona Decals are affecting lighting
Post by: Billabong on 2023-07-25, 19:54:25

So after a lot of back and forth with Chaos. This as they said is a known issue and have no idea when it will be fixed.

Title: Re: Corona Decals are affecting lighting
Post by: maru on 2023-07-26, 15:24:28

(Internal ID=1146227482)

Title: Re: Corona Decals are affecting lighting
Post by: Billabong on 2023-07-26, 16:21:17

Quote from: maru on 2023-07-26, 15:24:28

(Internal ID=1146227482)

Not sure what that means.

Title: Re: Corona Decals are affecting lighting
Post by: TomG on 2023-07-26, 19:53:23

It's our link to our internal tracking of the issue, so we can easily jump to it from this thread (and vice versa).

Title: Re: Corona Decals are affecting lighting
Post by: Billabong on 2023-07-27, 02:34:41

Quote from: TomG on 2023-07-26, 19:53:23

It's our link to our internal tracking of the issue, so we can easily jump to it from this thread (and vice versa).

 Gotcha, Thanks!