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I'm trying to bake lightmaps. This is how my scene looks like as rendered by cycle:

enter image description here

As you can see, the blinds should cast shadow on the floor. I then wanted to generate lightmaps that can capture this shadow for real time rendering. But I don't know why, the lightmap doesn't contain this shadow, but a few gray patches.

enter image description here

The uv mapping seems to be correct.

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I got it now. The problem was that the floor and walls had their normal flipped. After I checked backface culling, this became obvious. Fixing the normal direction solved the problem.

enter image description here

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