By Bogdan Coroi
#279773
The assigning part should be done in a classic 3dsMax manner, that is, by selecting one face from the Edit Mesh modifier and assigning an ID. In your case, face 1 gets ID 1, and face 2 gets ID 2. That means, from the Multi/Sub-Material assigned on the plane, face 1 will get the sub-material with ID 1 and face 2 will get the sub-material with ID 2.

On the other hand, MXCL doesn't support emitters applied on a single polygon, so you'll have to apply it on the full object. I'd recommend using 2 planes with separate emitter materials (yellow and blue).
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