What scene is able to compare VRay and Maxwell ?

[Paul Oblomov]

What scene is able to compare VRay and Maxwell ?
Smth, that could be easily noticed! No skylight or phys sky (for 1.47.03). Just pure light emmiters and materials! Typical scene full of boxes or smth complex ?

I think I don't know !
Do you ?

P.S. I think it's time to make available VRay 1.47.1x ! Really interesting less noise with QMC !

[vlado]

It very much depends on what you want to compare... in any case, do not expect identical results even for the same scene - for example, the maxwell image is always going to have vignetting, whereas the V-Ray one will not.

There are some simple scenes for which the global illumination can be computed by a formula, and V-Ray has been verified to produce correct results in these cases. I can post them here if you are interested.

Best regards,
Vlado

[Dynedain]

A big problem with the comparison is that maxwell requires you to use maxwell materials. And vray works best with vray materials (even though you can use standard materials, but not raytraced or the new "architectural")

[TRGraphics]

Until maxwell can render something in a reasonable amount of time, why bother. It's to slow to use in production for most people. Unless you like grainy images that is.

Tony

[percydaman]

actually, with the latest build, its ALOT faster. still cant compare to vray, but its at least closer to brazil.

[Paul Oblomov]

I mostly mean not rendertime, but quality of lightnig. If it said, that "maxwell - 100% physically correct result", interesting to see the difference between VRay and Maxwell in identical lighting situation.

[vlado]

V-Ray can also produce physically correct lighting. Just because Maxwell is based on real-world physics, doesn't mean all other render engines are not. Admittedly, V-Ray does not work with spectral calculations internally, but in (the majority of) cases where this can be ignored, V-Ray is physically correct.

Best regards,
Vlado

[jujubee]

V-Ray does not work with spectral calculations internally

A little off-topic - but I've wanted to ask if there are any short-term plans to eventually incorporate this into Vray or if that is something which will take alot of re-programming?

[Paul Oblomov]

A little off-topic - but I've wanted to ask if there are any short-term plans to eventually incorporate this into Vray or if that is something which will take alot of re-programming?

Bad idea - I want VRay 1.5 this year

[jujubee]

LOL - I was implying the 2.5 release.

[Morbid Angel]

Guys, infact I am at this moment sitting in the office on a sunday and doing a vray/maxwell/real world comparison. So, I will post my results in a while. My test focuses on comparing vray to real photgraph and maxwell to real photograph, as comparing vray to maxwell and vise versa is not correct. There for I made a stand point of photographs to mimic their lighting and conclude. My focus also is to determine the reasons for vray gi saturation and default calibration, gamma correction and etc.
I have made some interesting discoveries...

[Gijs]

My focus also is to determine the reasons for vray gi saturation and default calibration, gamma correction and etc.
I have made some interesting discoveries...

Me too...I've seen that most colour bleeding problems are history when applying a gamma curve. Even the combination gamma-curve and intensity exponential color mapping seems to be a very interesting combination.

I'm looking forward to seeing your results

[Gijs]

Some images to illustrate it:

gamma-correction color mapping (g2.2):
As you can see it is essentially linear with the inevitable burnouts



intensity-exponential color mapping with gamma correction in post:
IMO right balance between color preservation and brightening of light areas:

[flipside]

Ha that attic model brings back old memories

Nice images, but I wonder what a real pic would look like in that lighting situation. Wouldn't there be burned out areas too if you adjust your cameras exposure to leave the walls so bright?

[Gijs]

Actually I am not quite interested how a camera image would look, I would be more interested how a HDR image of that situation would look.

But as Vlado has explained, Vray makes physically correct lighting calculations, so it only depends on materials and tonemapping if an image looks real or not. But what's real? I would say if it looks real it is real. And even if it doesn't look real, it can still be satisfying. In case of the image above, it is satisfying, because it maps a larger dynamic range into one picture.

If you look at professional photography, there are also many approaches to tonemapping, depending on the kind of film - or in case of digital cameras, depending on the software and how it is treated.

Look at this image below for example, it doesn't necessarily look realistic, but it has a lot of color information a normal picture wouldn't have, and certainly looks artistic

http://www.hdrsoft.com/images/viaduc/tm.html