I have problem with rendering in cycles render in this building. I placed lots of different lamps and increased the amount of emission in the lamp, but it didn't work.
If I render, it shows this:

Render result


All the walls etc. only have a glossy shader with 0 roughness. This means light will be reflected specularly, without being scattered. In other words, every surface is acting as a perfect mirror.

See How do you make a lamp light up glossy surfaces? for a more detailed explanation of why this is a problem.

To fix this, try using a diffuse shader instead:

enter image description here

Though eventually you'll want to set up a mix of different shaders (probably a bit of both diffuse and glossy) with textures, etc.


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