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i am trying to render some ligths on a floor...
i assigned emitters to boxese on this floor but they render black...
i have tried everything... flip normals redoing boxes, doublesiding... mirroring the face... nothing ...the upper face ( the face seen from above) render black the under face( face seen from under) render correctly..
i invert normal.. mirror the face...the behaviour is the same..
i am wondering
emitters can be seen correctly just from down to up and not viceversa?

could u try to do multilight render mode and check if ur emitters actually appears as a channel on the emixer???