Animation optimizing chrome reflections

[Magnum_design]

Hi

Im otimizing scenes for animations and render using Br / Lc universal settings. noise 0,02 and default denoise settings. Lc 300 Retrace 8. For now I´m getting flicker in kitchen door handles ( glossiness 0,9 fresnel reflection ) in an interior rendering with moving camera and objekt. Question is what will fix this ? First thought is that it needs more turbosmooth iterations and maybe a bit less shine. Could this help ? Unfortunately I can´t afford to boost rendertimes more. I´m looking for other tips ?

[Morne]

Try 2 or 3 for min
I hope you mean 3000 for LC and not 300

for the denpoiser, set it to generate the channels, but then run the denpoiser on the resulting EXR sequense afterwards

[Magnum_design]

Try 2 or 3 for min
I hope you mean 3000 for LC and not 300

for the denpoiser, set it to generate the channels, but then run the denpoiser on the resulting EXR sequense afterwards

Yes it´s 3000

Ok so 2-3 min subdivs for image sampler ?. I will try that. But don´t you think that none smooth surfaces like a shiny cylinder with to few faces can produce flickering as well. Maybe we stare to hard at the rendersettings som times ? I mean when One object is flickering and the rest is looking ok.

[Magnum_design]

Im saving the sequence as a 32 bit exr with noisereduction set to generate render elements. File is around 100meg each. I this correct ? Does it matter whats in the drop down menu ? "Hide denoiser result channel" etc...

[dgruwier]

If your material is pure chrome, I would expect noise or fireflies (individual pixels changing brightness) but not flickering (areas pixels changing brightness together)

You could start by debugging where the noise is coming from, like which render layer it's happening in (diffuse, lighting, reflection etc), and what specific object or light is causing it. Try disabling reflections, shadows, etc.

Reducing glossiness slightly can help smooth out noise and fireflies on small shiny objects. You can also try reducing the max reflection depth on your materials to 1 and see if that does anything. If it does, then increase it until it starts flickering again.
Last resort could be rendering just the handle in a separate render layer with different quality settings and then comping it back together, so you can render the handle at much higher quality without having to render the rest of the scene at that quality.

[piotrus3333]

I remember animation with that issue. chrome kitchen downlights. quick fix - rendering problematic areas with higher aa settings with VRaySphereFade.

[Neilg]

try sub pixel mapping and clamping set to 4-8.

[Ihno]

I've never had GI flickering with BF+LC in animation settings. It was always bad geometry (mostly CAD with dublicated faces) and the reflections or GI coming from it.
A small secoundary rays bias might help.

Or the clipper, that thing doesn't seem to be stable for animation. (knowledge from 3.4-3.5 might have changed in meantime)

[Magnum_design]

Thanks for tips and tricks. I region rendered the handle with less glossiness and that did the job. Problem i still there though if I want shinier handles, but I have no time to spend on this now

I agree with you Ihno There´s very few problems with this setup. I guess it´s also depending on what lightsource and background you are using. I use a domelight with a hdr and a bent plane with light material as backdrop. Latest projekt I tried a ordinary vray material with bitmap and disabled the shadows and reflection. But that gave me bad flickering in some areas. So back to the light material setup with no preview

[^Lele^]

a bent plane with light material as backdrop.

If it's just a background, make sure you put the light material into a wrapper, and turn off GI emission, so not to waste any time with it.

[Magnum_design]

If it's just a background, make sure you put the light material into a wrapper, and turn off GI emission, so not to waste any time with it.

Great, thanks !!