LuxCoreRender Forums

Hi guys,
I'd like to share a real job I did for my company.
It's a good small project and I'd like to test LuxCore in a "easy" manageable project to reduce production risks.

I have to say that it was a good experience...the main difficult part was to be as much productive as I could reducing the "how should I do that kind of shader or what render options" phase.
Now, as subject, I have a question for you.
I decided to use Direct Light Cache as I would have a real lighting scenario (actually the main reason is that is not possible to use "real" invisible area lights) and as you can see I have a lot splotches in the scene.
I've tried to raise the warmup samples number (I've tried up to 512 without any visual improvements) but it seems that it's not the reason for that.

What should I tweak to eliminate it?

I've tried using the LogPower strategy and it's fine but it has more noise.
I really like to use the DLSC but I'd like to understand more how it works and which kind of settings I should tweak for best results. About the lighting I have an emissive material with DLSC option enabled and the material is assigned just to this triangle (a question: when I have a sub material like this, the triangle count for lighting is just with poligon assigned with emissive material or all the main object?)

Are you using glossy surfaces with high roughness values (> 0.2) ? Can you switch them to normal matte and retry ?

marcatore wrote: ↑Fri Nov 16, 2018 8:57 am (a question: when I have a sub material like this, the triangle count for lighting is just with poligon assigned with emissive material or all the main object?)

Only the parts with emissive material.

Dade wrote: ↑Fri Nov 16, 2018 9:10 am Are you using glossy surfaces with high roughness values (> 0.2) ? Can you switch them to normal matte and retry ?

Yes I'm using glossy surfaces...so just to understand, should I switch any materials in the scene?

I'll try.

B.Y.O.B. wrote: ↑Fri Nov 16, 2018 9:12 am Only the parts with emissive material.

Thank you, so I did the right way. Is it correct?

marcatore wrote: ↑Fri Nov 16, 2018 9:32 am Yes I'm using glossy surfaces...so just to understand, should I switch any materials in the scene?

The one showing the splotches.

This is the result with matte materials applied to the particles of the floor carpet.
As you can see the splotches are still visible, less then before but they're still visible.

What is your Warmup samples setting ? try to set it arround 512 -- 2048 or higher if splotches are still visible.

I've tried as suggested to rise the warmup samples.

512 2048 It seems that a little but very little visually improvements is when I switch to 512... 2048 seems has the same quality of 512

In any case it doesn't solve

marcatore wrote: ↑Mon Dec 03, 2018 2:34 pm In any case it doesn't solve

I need a test scene.

Dade wrote: ↑Mon Dec 03, 2018 2:37 pm

marcatore wrote: ↑Mon Dec 03, 2018 2:34 pm In any case it doesn't solve

I need a test scene.

Isn't this always the same bug? I mean visually it always looks like the MIS issue with caching, or is it something different?