irradiance map + light cache // prepass flicker

[thestza]

hello.

i'm trying to render an interior scene with moving objects. i have calculated/rendered the sequence in animation prepass mode -- with irradiance map for primary bounces and light cache for secondary (see attached image for settings).

however, in my final renders, i'm experiencing a bit of flickering and cannot isolate the cause...

if i calculate/render the sequence in prepass mode with irradiance map for primary and brute force for secondary, i do not get any flickering -- however, the render times shoot up significantly...

any ideas on where i'm going wrong?

[olivervfx]

Not enough subdivs for the lightcache,

Make one big lightcache map if its a camera flythrough.... Also turn Detail on, for edges that can flicker.

(i'm still more fan of the brute force method, mainly cause deformation always works with it)

O.

[thestza]

hi Oliver,

thanks for your response. to clarify, should i add more subdivs for the irradiance map (primary bounces -- currently set to 50) or the actual light cache (secondary bounces -- currently set to 1200)? in the meantime, i'll try another test with more subdivisions for the lightcache.

also, i'm a bit confused about one of your suggestions:
"Also turn Detail on, for edges that can flicker."

will turning detail on add to the flickering? i'm trying to eliminate it if possible.

my scene has moving/animated objects. i prefer brute force as well, but the sequence is around 1500 frames and each frame takes about 30 minutes to render with brute force -- it would take about 5 weeks to render using that method, so i'm investigating other solutions...

[olivervfx]

Your subdiv on the lightcache,

Try 2000.


The "detail on" will remove flicker on edges... Trying to make your render better


Your irradiance is fine at 50....


O.

[thestza]

thanks Oliver -- running another test this evening...