Lighting and Rendering
For the lighting I used 7 Vray planar lights, one placed at each window. You can see the settings on the image below. That took care of the scattered, indirect light.
For the direct light that simulates the sun, I used another Vray light, but this time set to spherical instead of planar. Since I wanted to create a warm morning atmosphere, I set its color to a bright yellow/orange.
Additionaly I used an HDRI image in the environment slot. It doesn't make a lot of difference in terms of reflections, because it is an interior scene, but it does affect the atmosphere in the room a little.
Render settings are nothing special: for the global illumination I used the Irradiance map for the first bounce and QMC for second. The irradiance map is set to medium (40, 40) – it was enough and I didn't want the render time to take too long (already it was about 12 hours). The antialiasing is set to Adaptive subdivision and the Catmull Rom filter is used to make the image as sharp as possible.
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