I use 1 brown/grey omni, ambient only, placing it in the middle of the interior and the start of the far attenuation is fit to the room.
Put light blue omnis, ambient only, in the openings between the columns. The start of the far attenuation is also fit to the opening. The sub-ambient blue color is a skylight ambient which scattered around the area.
3.1 Creating skylight
Copy the skylight omnis and change ambient only to diffuse and specular. This is to create specular and diffuse pass of skylight that affect the scene.
3.1.1 The darker area in the highlight area on the picture is the area between start and end of the far attenuation.
3.1.3 The area between the start and end attenuation of each omni in the scene when intersected, will still be darker and look like column shadows. So with this effect, we sometimes don't need to make all the skylight cast shadows.
Place 2 direct lights up and down to ceiling and floor and make the shadow density negative and color to be grey. The hot spot and fall off of the lights will be fit to the building as well.
Create a target direct light with raytrace or advanced raytrace shadows set to cast sharp-edge shadow directly from sun.
5. Sunlight illumination
The scene with large openings has direct sun illumination . I place omnis down to the floor at the same position of the sunlight on the floor to create bounced light which illuminates the area. I also want the light to affect some parts of the timber ceiling so I make the omni's attenuation touch the ceiling.
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