Can you do this in SketchUp ?

[Gach06]

Can anybody tell me why a render in 3DS Max looks better than one done from SketchUp? Don't get me wrong, Vray 4 SU beats all other render engines but its 3D Max counterpart still has a few tricks... For instance the edges in a Max Render seem slightly more realistic. I'm I alone on this?

Another Question: In 3DS Max there's an option, when one is setting up emissive materials, that enables the object usually lights emit colored light that affects the lighting of the scene. I'm aware that Vray 4 SU has this but the emissive objects in SU just glow they don't 'emit' colored light. For it to affect the colour of the scne on needs to place a rectangular or point light. (If i'm wrong here please,school me )I think the option in 3DS MAx is under radiosity and they actually emit energy. Checkout the images I think we need that glow...


If the difference is as a result of extra features is there I way I can fake it till Vray4 Su makes it (to 3DS Max Level) ?



Our Faithful SketchUp:



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3DS Max:

[dalomar_cg]

Re: Can you do this in SketchUp ?

It just looks to me that you haven't cranked up the intensity of the material enough. In order for it to really contribute to the lighting of the scene, it has to have enough intensity to do so.

[Macho3001]

Re: Can you do this in SketchUp ?

Okay, there're a few things that may clear your issue a little..

Radiosity is the way rendering engines "looked" at 3d space while rendering assuming that light is reflected off surfaces as energy, and thus, before rendering, the software constructs a MESH of the light energy emitted from the lights and bounced off the scene, it is somewhat similar to the 3d face mesh, but has points marked out where the light energy is more, and where its less, so the software can figure out a way to render the pixels. Radiosity was the common solution in the (old) days when we didn't have something known as GLOBAL ILLUMINATION. Nobody uses radiosity nowadays, vRay supports global illumination (both the SU & MAx versions do) by means of the Irradiance map option which recreates the points of global illumination on the surfaces of the 3d object somewhat similar to the light mesh made by the radiosity options used in the past.

The reason why your image does not have the light bleed effect is due to two factors: - 1. Self illuminated objects do not emit light rays similar to lights (their quanta is much much less), so you'll have to increase the intensity & 2. Check the radio button of using the Global illumination to ON, under the Vray Indirect Illumination options. To get the similar effect, I'd suggest you use Irradiance map + LC option. Please post your results on trying so,

Hope that helps,

Macho

[Gach06]

Re: Can you do this in SketchUp ?

Thanks Macho3001 for clearing that up. i changed the model slightly have a look.The Irradiance map+ LC Option is also a good way of producing a clean render without the slotchyness associated with the QMC engine....rite? And Dalomar my initial intensity was 10 i had to crank it up to 80,000! and it worked. Thanks a lot!

[dalomar_cg]

Re: Can you do this in SketchUp ?

The Irradiance map+ LC Option is also a good way of producing a clean render without the slotchyness associated with the QMC engine....rite?

No, and if anything its the exact opposite. The only artifact in DMC calculations is noise or grain. IR and LC both produce splotchiness with an inadequate solution.

[thomthom]

Re: Can you do this in SketchUp ?

The Irradiance map+ LC Option is also a good way of producing a clean render without the slotchyness associated with the QMC engine....rite?

No, and if anything its the exact opposite. The only artifact in DMC calculations is noise or grain. IR and LC both produce splotchiness with an inadequate solution.

Sorry for going somewhat off topic, but what Secondary Engine is good with DMC? DMC here as well, or LC? I'm thinking for scenes with glossy reflections and small details.

[dalomar_cg]

Re: Can you do this in SketchUp ?

I like pairing DMC with LC. There are very few cases where both bounces need DMC. Luckily its fairly easy to "hide" some of LC's faults in secondary bounces.

[thomthom]

Re: Can you do this in SketchUp ?

I've used IR+DMC for a scene I'm currently working on. It looks ok, but I'm not sure if it's an efficient setup?

[dalomar_cg]

Re: Can you do this in SketchUp ?

Umm...I personally flip flop on whether LC or DMC is better for secondaries. I'm using more DMC when I'm using DR bc LC doesn't get calculated by the nodes. Right now its really more of an "it depends" kind of situation. Mostly because you'd be surprised on how many situations actually have very little contribution from secondary rays. The only situation where I'd really say that LC is really preferred over DMC is interiors. LC will let as much light "live" as possible and will generally calculate much quicker than DMC will. Other than that, I think most other situations you won't see much of a difference.

[thomthom]

Re: Can you do this in SketchUp ?

Well, on this particular model I'm using IR for primary and DMC for secondary.
Today I've tried the same model with DMC+LC where I do feel it gives a better result in terms of colour variances, butit much much darker than my other setup. If I adjust the camera exposure to brighten up the overall scene I get burn-outs in my chrome reflections.