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Lightmass + Environment Maps?

How can I get lightmass to incorporate a environment map (cube map) in it's global illumination lighting calculations?

So far I've tried setting up a skycube with emissive material. I've checked "Use Emissive For Static Lighting", increased emissive boost, made sure "Use Global Illumination" was checked, built lighting, etc. I tried shrinking it down so that it was practically touching the other objects in my scene, and made sure it was within the light importance volume. Emissive lighting seems to work on other objects as long as they are under 5000 faces, and my skycube is only 12 faces.

I've tried everything I can think of to get this damn thing to light. Why doesn't Lightmass specifically have an option for a TextureCube sky material or something?

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