LuxCoreRender Forums

Sharlybg wrote: ↑Sun Jan 09, 2022 8:08 pm You are just running through the first kernel compilation.
you need to let this process finish correctly the first time.
Btw your cache settings may not be optimal I can tell more
if you share some screenshot of the scene.

Sharlybg wrote: ↑Sun Jan 09, 2022 9:48 pm Cache settings are linked to the scene design :

1__ How much diffuse surface do you have compared to reflective one
2__ How much opening do you have to let light enter
3__ Overhal lighting setup

In most case I proceed like this :

1__photon count : It is dependent to scene size but I start with 1 and only increase when needed
2__ Brute force radius scale : it help mix brute force with photon gi to avoid artifact. You can lower it at 1 or even below that with good mesh and normal orientation. lower it is faster the render and easier to have artifact . higher is a bit slower but more accurate to. scene with lot of diffuse surface benefit alot from the photon gi cache.
3__ Env cache : I tend to enable it for final render when i am already satisfied with the quality and other render setup because it can be a bit long to compute.
4__ light importance : I always set light source with bigger contribution to scene illumination with higher Light importance value and the inverse for light source with lower contribution

example day light: HDRi = 50 / Small lampshade = 5 / tiny led light = 0.0001
example night render: HDRi = 2 /ceiling spot light = 50 /Small lampshade = 10 / tiny led light = 0.0001

I set all values to the minimum, the cache worked after an hour and a half, but on subsequent scenes it was still long even taking into account that the cache was saved.