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Luxcore vs rest of the world

Posted: Fri Sep 10, 2021 12:39 pm
by daros
Hi, this post is intended to do some justice to Luxcore's bidirectional rendering engine.

To that end, I've prepared a scene that is not the typical HDRI + toy car. It's not a very pretty scene, but it reveals a lot of interesting information.
It is a very easy scene to set up, without textures, (textures don't reveal much about the speed of a rendering engine), so that everyone can repeat the test effortlessly on other rendering engines.
However it is a scene that easily represents the complexity of a modern store or bar or lounge, with shiny materials, lots of glass, reflections, and so on.
I asked the people who did the testing for two results:
First result with a very fast basic set-up, without tweaking the rendering engine
The second result with an advanced set-up, tweaking the rendering engine to get the best. No baking allowed. If there is any precalculation this should be added to the rendering time.

But since the following results were not all made by me I am not sure of their correctness. I'm only sure of the Luxcore and Maxwell Render results that I did personally. So I really appreciate any corrections from you guys. On rendering engines like Vray and Maxwell I decided to publish the results only on GPU because these companies claim the unconditional speed increase on GPU compared to CPU.
As hardware I put the best hardware available today, which means the nvidia 3090 and the Ryzen 3990, neither of which I own nor the people who did the testing. I simply scaled the result based on the performance gap between the hardware used and the results of official benchmarks on similar rendering engines. This is one of the benchamark pages I used: ... ed-scores/
For example if the test in Vray was done on a 2060, to get the approximate render time on the 3090, I divided it by 3.6, which is the speed multiplier I re-encountered.
I know it's not normal to do it this way but I did it because it makes everything more intelligible.

Here the results:

Luxcore Bidir on Ryzen 3990x

Basic set-up and advanced set-up - 8 minutes

Luxcore GPU still missing! Coming soon!

Corona 7 on Ryzen 3990x

Basic set-up - 7 minutes
ryzen 2700x - 45 minutes .jpg

Advanced set-up - 16 minutes
ryzen 2700x - 107 minutes .jpg

Vray RT on Nvidia 3090

Basic set-up - 10 minutes

Advanced set-up - 14 minutes

Maxwell Render 5.2 on Nvidia 3090

Basic set-up and advanced set-up 26 minutes
240 min 1060.JPG

Lumion on Nvidia 3090

Basic set-up - 2 seconds
i74790K-1060-5 seconds.jpg

Advanced set-up - 10 seconds
i74790K-1060-72 seconds.jpg

White balance applied to all images in post.

Following are the settings to replicate the tests:

Camera position: 5,0,1.2
Camera target: towards the opposite wall
Camera angle

Material and lighting description on the OBJ's layers.
24 light bounces, 256 ray bounces.

Re: Luxcore vs rest of the world

Posted: Sun Sep 12, 2021 5:47 pm
by daros
i'm updating the scene with a more appealing version

Re: Luxcore vs rest of the world

Posted: Mon Sep 13, 2021 8:16 am
by kintuX
Interesting, but...

What about other engines like Cycles, Radeon ProRender, RenderMan, Indigo...?
Plus, it would be good to have full specs of the original scene (lights, colors, rays/bounces, ...) or preferably, attached as a reference. Especially, since Corona's results look quite different.

Re: Luxcore vs rest of the world

Posted: Mon Sep 13, 2021 8:52 am
by daros
Yes i agree, i will also add indications about light bounces and raybounces. First let me update the existing results with the new scene, then i will try to test the other engines.