GI noise and more realistic render?

[antoine82]

Hello,

im' working in a production agency!

sepcializing in archviz, i want have ever more realistic and impressive render;

so i have an idea,

Can you add  customisable noise in te intensity of GI rays and in their directions?(the idea is to recreate an imperfect GI to simulate the artefact of the surface with no additional work time)
Combine to a radius both customisable, dependent from the distance between surfaces.

may be it's impossible or sensless or you have already think?

best regards.
thank for your work.

[maru]

Sorry, but I do not really know how to understand this. Maybe you could come up with some examples, how your idea could be utilized in practice?

[antoine82]

Hello,

i'm not physicist or developper but i try to explain my idea.

-the attached "schematique view" try show how i vizualise the treatement off the GI rays.

-the attached .GIF and "caricatural view " try to illustrate what the intensity variation can produce on the render.(i fake this effect using ray switch material and noise map)

-the "capture" file try tout explain how can be interpretated the GI rays direction variation, similariy to the microsurface theorie for rougthness in PBR rendering.

I have no precise idee of the final impression  on render but i submit to you this idae.

In complement we can imagine to remplace the radius use by noise map

best regard

Antoine.

[maru]

So basically you would like the GI to produce splotchy textures (like in cached solutions with very low settings - like Corona's UHD Cache or V-Ray's Light Cache) - right?
But that would result in splotches not only on the walls, but also on all other objects, such as furniture.
Why would you even want something like this?

Corona is intended for unbiased rendering, or at least the bias should not be perceivable. We want to get rid of any visible noise or splotches, not introduce them. :)
If you would like to see a crazy GI calculation, with lots of artifacts visible, you can try the "Psycho" random sampler in the development/experimental stuff rollout - here is how to enable it: https://coronarenderer.freshdesk.com/support/solutions/articles/12000021288
Hope that helps. :)

[antoine82]

hello,
i understand perfectly what you want to say.
in my idea the reality contain atrtifact but my demo is just caricatural.
i imagine fineness and customisable, not splotchy.
but  i'm not sure.
my idea is to simulate imperfect surfaces, not to create splochty error.
 
I try to send you another example more explicit asap.

thank for your work

Best regards

[TomG]

Imperfect surfaces should be created by editing the materials though - glossiness maps, bump maps, and similar should realistically create any imperfections in surfaces.

[romullus]

my idea is to simulate imperfect surfaces, not to create splochty error.

I think you would instantly regret that idea the moment you'd need to render animation :]

[antoine82]

thank for your feedback!

i have'nt aticipated the animation probleme.

i understand your answer.

Best regards