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Stationary Lights GI

Hi, I'm new to the engine, though not new to the computer graphics.

Recently, experimenting with Unreal Engine lights I discovered that changing it's parameters like intensity and color doesn't affect its GI impact. Though, it should, by stationary light description (it's a light, which position is constant, but parameters might be dynamic). Seems that it's been this way for a few years. On the forum I found a question about that - a developer wanted to make a partially dynamic light in an interior scene - one light inside each room in 3D house. So, those lights are defined as stationary and precomputed. GI produced by them looks very nice and realistic. But once you dynamically change its intensity, let's say you turn off the light in the kitchen, only direct light impact disappears, all GI from it stays there and looks broken! I'm pretty sure you are aware of this behavior and would define it "by design", but we, engine users, really want GI be more dynamic! It's extremely important in the interior scenes. I understand that it would require to build lightmaps separately from each light source and consume a lot of memory. But why could it not be an optional feature? It doesn't seem to be too difficult to implement.

Thank you, Artem

Product Version: UE 4.15
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asked Mar 19 '17 at 12:11 AM in Rendering

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