LuxCoreRender Forums

Maybe you wish to play around with different Metropolis parameters or Light|Emission performance|importance ..

#Caustics and Shadows of an empty vine #Glass depending on Spot light's type

The Blue Spot light throws indirect light only. It's lamp shade is an open half sphere mirroring light of a half Iso sphere emitting light inwards.
The Yellow Spot light is a default Blender / #LuxCore light.
The ...

To test temporally stability of BiDir Metropolis renders I set up a scene with to different Spot lights. One spot is the built in light, another contains a half Icosphere with emissive Matte material. The Icosphere points inward an open half sphere with Material Mirror. All light from this complex ...

Noise patterns of indirect lightening depending on Metropolis' Settings.
(part two)

Yes, our scenes often contain objects with lots of emissive triangles. This is one of th reasons why we stick on bidir, because it normally handles millions of emissive triangles + caustics and so on without any issues.

Tomorrow i revise the light importance idea but it seems to me something ...

FarbigeWelt wrote: Tue Jul 01, 2025 6:37 pm
Indeed Lux could be the better choice for complex lights.

1 Lx = 1 Lm/m^2

This means Lux are area normalized Lumen.

But there isn't any such choice in BlendLuxCore ..

daros wrote: Tue Jul 01, 2025 3:26 pm
Regarding the brightness of the light related to the area of the amitting surface, this should be only in case if you use Lux variables insted of Lumen values, or not?

Indeed Lux could be the better choice for complex lights.

1 Lx = 1 Lm/m^2

This means Lux are area normalized Lumen.

The kind of light also is important, if you want comparable brightness define lights as physics not as artistics. I prefer to define brightness of lamps in lumen.

EDIT (facts you probably know well)
Another big influence on the brightness of light is its area.
A further influence is the maximal ...

I don't know how the Metropolis algorithm chooses its generated Random numbers. Actually if it works with a seed number it should always produce the same series of generated random numbers. A developer should be able to check this.

Did you already check if your scene contains lamps with many ...

So the we opted for an metropolis+AI solution for animations. We render one each 10 frames using bidir and interpolate the sequence using Dain Ncnn or IrfNet. In most scenes it gives us the highest quality and perfectly smooth and and flicker free animations while keeping 2k frames aroud 1 minute ...