Discrepency between Beauty and Light Mix

Corona Corona for 3ds Max Help Required
1

I’ve just setup light mix. The scene only has 3 lights. I’ve not adjusted any setttings yet in lightmix, just separated out the lights. But there is a difference between the beauty pass and the light mix pass. The shadows are lighter in the lightmix pass. I’m just waiting for the render to finish and will upload comparision shots when it’s done, but just wondered if anyone had experienced the same thing.

But if my settings are as shown in the screenshot and those are the only 3 lights in the scene then it should look identical to the beauty right?

LIGHTMIX.JPG
LIGHTMIX.JPG280×217 10.9 KB

2

it should be unless you have anything in the rest that you dont know.

3

there are other lights in the scene but everything is turned off. I turned ‘Rest’ off anyway just incase it was picking up any of the other lights that were turned off.

LIGHT LISTER.JPG
LIGHT LISTER.JPG820×610 46.3 KB

4

Open these two on top of each other in PS and switch between the layers. They’re not identical and they should be.

BEAUTY.JPG
BEAUTY.JPG564×886 64.8 KB

LIGHTMIX.JPG
LIGHTMIX.JPG564×886 65.1 KB

5

Corona and DCC version?

6

I always found this to be the case as well, although very minor, so I never really even bothered to do PS overlay to check. I thought it’s byproduct of some order-of-operation or layering method, etc..

7

Yeh it’s more obvious when you view the whole image, but I think even that crop is signifcant enough. If its perceptible just from switching from Light Mix to Beauty in the frame buffer then it needs fixing imo

8

Corona 11 Hotfix 1 - not sure what you mean by DCC

9

Hey, can you try with Corona 11 HF 2, just to be sure? because there were some changes related to color and removal of gamma operator.

10

Hi Avi, no luck I’m afraid. The issue persists with HF2

11

Thanks for checking.

In that case, please start a ticket and send us the scene , along with repro steps.

[url=http://
https://support.chaos.com/hc/en-us/requests/new]
https://support.chaos.com/hc/en-us/requests/new[/url]

I will look into the issue.

12

Will do. I’ve also got a another issue/bug with this scene. Can I report it in the same ticket?

13

DCC is Digital Content Creation or in this case Creator - ie, 3ds Max or C4D with associated version number :smiley:

14

Cool, I’ll include all info in the support ticket. Uploading now

15

Ticket #246345 scene is confidential

16

Response from support -

"Hello,

After discussing this issue with our devs, it seems like they are aware about this issue, and it is currently logged in our system. It is currently being investigated. According to our devs, this can rarely happen when user uses UHD or 4K cache.

We will let you know if there are any updates on this."

Would have been good to know that before I spent half a day sorting the scene out ready for upload then waiting ages for the 6GB file to actually upload

17

Hi,

The scene is still needed for our investigation so when we fix the issue, we will test it in the reported scenes if it is working well or not.

Just a tip: You can always simplify your scene and send only the part that is causing the issue, it can save you all that hassle.

18

I have no idea what part of the scene is causing it. Also I had a previous message from support saying they can’t even open the scene because it crashes despite me having no issues at all opening it at my end. So it seems it was indeed a waste of time.

19

If it crashes for us opening it, definitely not a waste of time, as we’ll be looking to fix that crash too as a bonus extra. TBH sending in a scene always helps, so is never time wasted. And we do appreciate you taking the time to do that!

20

It’s all good.