The strength of the background may change depending on the scale of your project, but I usually start with something around 1 or 2 units. If you want the exact color, try the R: 0.8, G: 0.86 and B: 1.0. The background of the scene should use a solid color I like to use a light blue.

The basic setup of any scene for Blender Cycles that should use natural sunlight is made by the sum of a background color and a Sun Lamp. So, how can we setup a scene a scene for natural sunlight with Cycles for architecture? Is it hard? What`s the secret?

Not even on Blender 3D Architect! Shame on me! He said that there weren`t any kind of information about that on the web, and after a few searches I really couldn`t finds anything related to that.

A few days ago one of my students ask me about the setup for a daylight scene in Cycles. But, only a few of them deal with natural light sources like the sun. There are a lot of examples and projects about Blender and Cycles for architecture related to interior visualization.

Blender lighting setup