Is LuxCore a Spectral Renderer?

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Glendaloch
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Is LuxCore a Spectral Renderer?

Post by Glendaloch »

I read the thread further down here...but am still puzzled. Luxrender was spectral, like Maxwell? Luxcore is not, or only partially? There seems to be very little on the web about any of this. It doesn't seem Indigo is spectral anymore? Any ideas? Knowledge in this area? Please!
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Sharlybg
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Re: Is LuxCore a Spectral Renderer?

Post by Sharlybg »

No Luxcore isn't currently a spectral renderer even if it is able to render some spectral effect like dispersion on demand.

And yes Indigo is still full spectral renderer.

There are discussion about the possibilty to switch to full spectral rendering but with the speed penalty we need to have convicing reason to do so.
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Glendaloch
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Re: Is LuxCore a Spectral Renderer?

Post by Glendaloch »

I can’t find the word “spectral” or mention of such on the Indigo website, though maybe missed something. Maxwell does mention it.

Just think that Luxrender produced a richer and perhaps truer light, was in fact better than Maxwell, certainly more fun without the commercial trappings.

I like your prism and caustics at the Gallery here in the abstract section, Super Work yes! But much of the other work, though more “flashy” and sharper than LuxR seems to lack something, a depth of color –for lack of better words…I do more landscape and outdoor stuff, so may suit me.

But if a render takes 10 minutes or an hour, for a still image, don’t see why it matters, even all day if it is really good…. Anyway, Thanks for the info!
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Re: Is LuxCore a Spectral Renderer?

Post by Sharlybg »

Indigo full spectral !
https://www.indigorenderer.com/unbiased-rendering

Of course i can understand your point. In the past there was plenty of unrealistic rasterizer engine everywhere and Photerialism was king at any price. But then come optimized renderer because not every project need to look extremelly unbiased. So for the Sake of efficiency industry turn to Physically plausible rendering wich in fact is well suited for :

__90% archiviz

__ 100% anim cgi movie

__ 70% Vfx movie

.But alot have change since thoses days.

Even game engine are able to do plausible "realistic" rendering : Unity / Unreal

Many archviz tool are almost able to close the gap plausible "realistic" : Lumion / D5 / Enscape


. Hardware are no longer weaker as before :

___ with 32 to 128 thread CPU becoming mainstream.

___ with hardware integrated raytracing accelarator (GPU_rt core)

___ With improved algo like online guided path tracing.

___ With AI

I think here is the time for offline renderer to consider to Close the gap with reality.

Even rendering Gamut (rec709) are concerned.
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Re: Is LuxCore a Spectral Renderer?

Post by juangea »

It matter because of production costs.

If a render is slow production costs raises, if you want to render an animation, it’s not the same to render 10 minutes or 60 minutes per frame, just go to any renderfarm and check it.

LuxCore is open source and free, but that does not mean it’s not used in production environment, in other words, it’s not just an experimental render engine, it’s a production render engine :)
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Re: Is LuxCore a Spectral Renderer?

Post by Sharlybg »

Yes cost is very important in production. One of the reason why an engine like Luxcore support Gi caching before Cycles and many others. But we are still doing Art and stills and hyper realism method can live side to optimized method ;)
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Re: Is LuxCore a Spectral Renderer?

Post by Sharlybg »

By the way appleseed seem to be spectral : under Rendering Modes https://appleseedhq.net/features.html
Spectral rendering (31 bands in 400-700 nm)
But does it look realistic compared to corona wich isn't ? don't think so. tonemapping / color gamut / shader realism seem to have more impact.
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Re: Is LuxCore a Spectral Renderer?

Post by Glendaloch »

“Physically plausible rendering” That’s a good expression!
juangea wrote: Fri Feb 28, 2020 9:19 am It matter because of production costs.

If a render is slow production costs raises, if you want to render an animation, it’s not the same to render 10 minutes or 60 minutes per frame, just go to any renderfarm and check it...
Not talking about animations…..and even biased renders can be effective, accent and minimize things, good in certain situations, I agree.

Not sure what to think of the Appleseed renderer? Maybe it is easy to use....

Thanks for all the information Guys, very interesting!
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