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Suppress Emmisive under Directional Light

This Blender tutorial by Andrew Price at 11:31 demonstrates what I am trying to achieve in Unreal Engine 4. (I tried to import the finished *.blend file into UE4 without success.)

I am working on a material Earth, which would be applied to a sphere. The material combines various Earth images including ground color, clouds, normal map, and night lights to create an Earth.

I have set the emissive property of the night lights image texture so that the city lights show on the night side of the earth. I would like to come up with some kind of a dynamic mask or some technique that will suppress the emissive property when that portion of the texture is lit by a directional light. (City lights aren't visible from orbit on the day-side of the earth.)

In the Blender tutorial Price uses shader nodes to add a mix node with a grayscale node and a color ramp

alt text

Any pointers? Is this doable in Unreal Engine 4?

Regards,

James R. Mireles Houston, TX

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asked Nov 11 '14 at 05:32 PM in Rendering

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MirelesJ
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