WIP | 2nd update | interior (only dir. light and sky)

[Gijs]

I am trying to figure out if I can light a scene just with one directional light and a GI environment. No Vray lights are used so far. Let me know your ideas. Details to be added in a later stage.

some facts:
color mapping exponential
direct light multipl.: 20
GI and reflection env.:gradient with 12 for output.

dining chairs from e-interiors

[lukx]

oh my...6H!!!

[Gijs]

6H is for lightmap+QMC (16 subd) and qmc noise tresh. 0.003 @ 2000 x 1500 pixels on a athlon 2200+. Since I let it render overnight it is not optimized.

[siliconbauhaus]

keep us updated on this mate. I'm working on a project where the building is quite deep and trying to get light in there is a big issue. As soon as I start putting vray lights in the render times multiply. I've been playing with using the vray lightmat for the lamp fittings in the problem area but thye dont seem to make much of a difference.

[zerofractal]

Gijs,

Nice floor map and material!! The direct sun light on the left bothers me a bit though...

[Da_elf]

some people goto all lengths to keep bright areas from being burnt out when in reality if it was a photo the bright area would be burnt out

[armilla]

Looks great - really nice lighting overall. Whilst bright sunlight would cause burn-out, that area of the image doesn't look quite right. In reality, I don't think the wooden floor would react to direct sunlight like that - it's too yellow or something.

The floor map is very nice - is it from a library, or did you make it yourself?

Keep us posted on progress!

[Gijs]

thanks guys so far for the comments

siliconbauhaus, check if in colormapping section clamp color is unchecked, otherwise vray light material hardly effects the overall lighting

as for the sunlight I think it might be because I used a very saturated color for the sunlight. I used color temperature to RGB covertor to determine the RGB values for the sun and sky assuming a sky color between 15000 and 20000 K and a sunlight of 3000 K with a whitepoint of 6500 K. Maybe a slightly higher color temperature can correct this.
as for the floor map, I downloaded a sample from http://www.highdimensiontexture.com and composited a floor out of it in Photoshop.

[timmatron]

Maybe if you added a little area shadow to your direct light, it would help soften those hard edges a bit.

[flipside]

Gijs, the real test would be if you would add details to walls and ceiling. As you see now, there are already artifacts and this is with the simplest wall/celing. From the moment you'll add some more old fashion details the blotches will drive you nuts. That's why I never use direct+sky only, you'll need to rely on GI too much for all the shadow details.

The floor looks yellow because of the colour mapping, no? It would be white with linear mapping I guess.

Why do you choose a value 20 for sun and 12 for sky? I'm interested in some kind of relationship between sun and sky strength, I usually guess it and in most cases I use double intensity for sun. Not sure if this is a correct relationship.

The room looks nice!

[Gijs]

update

a quick test. this time sun multiplier is increased to 50, and has area shadows. I think the indirect light from the sun on the sofa is more realistic.

to lukx: what do you think of this render time?

[flipside]

Hey Gijs,

were did the artifacts go?? Please tell us how you got this nice GI light without artifacts and in recordtime!

wouter

[siliconbauhaus]

as flipside said mate

lovely image btw

[Gijs]

Thanks siliconbauhaus.

well the time is only for bucket rendering

but with light cache and irradiance map it took only 8 minutes. on a dual 2.8 xeon.

settings are quite normal with medium irradiance setting. I think the reason why the first image shows artifacts in the ceiling corners is because the lightmap sample size has been too small. On the other hand the settings are too low now as you can see at the kitchen bar: underneath it has not enough shadow detail.

I think I will leave the lighting like this for now and start modeling all the paraphernalia.

[siliconbauhaus]

cool mate

I need to get to grips with the lightcache thing

keep posting updates