The render engine does take into account the extra rooms I created on the lower level, but only on the lower level.
Lights are created only in the middle of the ceilings and you didn't check the Visible ceiling box of these extra rooms. But if you do, it will create strange sloping ceilings because the walls around the rooms have different heights.
As you see below, I tried to create a big room with its (yellow) ceiling under the roof of your file, and I added 4 small walls close to the four corners of the room to ensure the sloping ceiling is correct. To ensure these small walls won't be visible, I put them in the existing columns.
When you render the house with this ceiling and the visible roof, you can see from this other image that the light in the middle of the ceiling is correctly created.
But when you render the house with the upper part of the house visible too, the interior is not enlighten and is all dark.
At this time, I have no idea why it fails.
I join the modified SH3D file to this message in case you've got an idea...
By the way, you could also hope that the rendering engine lets the sun light enlightens the interior of the house through the transparent panes of its windows, but miserably SunFlow doesn't support this feature.
I asked to the developer of SunFlow to support it. If it takes too long, I'll try to modify SunFlow code myself.
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Brad Pitt - L1 with ceiling.sh3d
(612715 bytes)
(Download count: 873)
(House with dummy walls and room added to create a ceiling at the correct place)----------------------------------------
Emmanuel Puybaret, Sweet Home 3D creator
