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Great work! The night shot is also my prefered, with the last one. Very well done !

3D Software ?
Hardware ?
Image resolution ?
Rendertime ?

It`s viz in 3dsMax 2013 with Octane Plugin.
Also i was use Multiscatter for grass, plants and environment parts.

Hardware is GTX 670 4gb (The scene took in memory 2.3 gb approximately)

Image resolution 2500px on the long side.

And render time is one hour for daylight render using PT (1000 samples) and 7-8 hours for night render (16000 samples) in two stages.

First stage is external artificial lighting using Simple Environment mode (5 hours).
Second stage is internal artificial lighting and skylight lighting using PT (3 hours).

Thanks for that information !

7- 8 hours is a LONG time for an image with this resolution !
V-Ray for example would definitily be faster (depending on the hardware).

Kind Regard
Alain

i can produce a4 sized interior renders 10-60 min. you'll need to do some optimizations.

It`s a debatable point.

I waited so many hours because scene has a lot of small light sources (~1000 internal and ~ 450 external). And they produce additional noise that disapears very long (It`s a big problem of Octane. All Iray light sources produce much less noise for example).

And one more thing is workflow for night scenes in Vray and Octane. Scene in Vray needs much more time for fine tuning before rendering pass and after rendering pass than similar scene in Octane (or we need to use high render settings that leads to long time wait).