light problem

[fabio81]

HI,

someone knows me explain why there are the spots on the wall?

[maru]

Hi, it looks like these could be UHD Cache artifacts. You can easily check that by switching to path tracing for both GI solvers.
We don’t want the UHD Cache to produce splotches, so sending a scene would greatly help too.

[fabio81]

Thank you for reply, where I can send the scene? Seem to GI errors

[Mvskokvl]

Here’s a quickie.

LightEmission-bug.7z (56.7 KB)

[fabio81]

Here you can see the problem with the rendered scene

[maru]

@fabio81

Thank you for reply, where I can send the scene? Seem to GI errors

Either here: Renderer for architectural visualization - Corona | Chaos
Or here: https://coronarenderer.freshdesk.com/support/tickets/new

[fabio81]

@maru

@fabio81

Thank you for reply, where I can send the scene? Seem to GI errors

Either here: Renderer for architectural visualization - Corona | Chaos
Or here: https://coronarenderer.freshdesk.com/support/tickets/new

ok thanks, just sent

[fabio81]

Also here the same problem, I noticed that a lot happens when the light is diffused

[maru]

Fabio, did you send the scene using the uploader, or submitted a support ticket?

[fabio81]

yesterday by uploader, thanks

[Ondra_1]

i forwarded the scene to Nik

[Mvskokvl]

fabio81
you have an emitter a single quad?

[fabio81]

@burnin

fabio81
you have an emitter a single quad?

I’m attaching the file, you’ll notice that the problem is with the diffuse light.
Let me know thanks

https://drive.google.com/open?id=0B2rKEzkL1GAKWWZJU3c3cmZjMjA

[Mvskokvl]

yup, noticed it before
bad model - intersecting & single poly
make more detail, more geometry…

fix attached

Advice
learn what not to do & how to properly model for fast and bug free rendering

PS
tho some breakage in lighting can still be noticed
i suspect something with the corona normal bug influencing the light emission… IDK for sure
for now subdivide emitters
GI problem solved.7z (71.2 KB)

[fabio81]

it is true in my light were missing subdivisions, but even now the result does not change, the problem is always there.
I saw that there is also in vray but the problem is solved by placing a light area.
In Corona however the problem remains even with light area

[Cinemike]

This begs the question: Does Corona use their own, homemade arealight or does it use the one that is built in C4D?
The one that comes with C4D natively is composed of more or less single lights.
It might not be as obvious in Corona, because it has no fake highlights, but still be a problem.

Just thinking
area fake.c4d (161 KB)

[Nikola_Tomsu]

@fabio81

HI,

someone knows me explain why there are the spots on the wall?

Hi, to remove artefacts you can increase UHD cache precision by increasing precision or/and changing the preset in render settings, please see the attached image. But during testing of your problem we found that there is another bug, and we must investigate it more.

[fabio81]

@nikolat

@fabio81

HI,

someone knows me explain why there are the spots on the wall?

Hi, to remove artefacts you can increase UHD cache precision by increasing precision or/and changing the preset in render settings, please see the attached image. But during testing of your problem we found that there is another bug, and we must investigate it more.

yes Perfect!! thanks

[Cinemike]

@Cinemike

This begs the question: Does Corona use their own, homemade arealight or does it use the one that is built in C4D?

So I was on the wrong track? That’s a relief!