Niagara flame not casting shadows

While it’s quite impressive what lumen is able to faciliate at the moment, lumen’s interaction with Niagara is quite, quite strange. It can pull light from screen-space, but Niagara fluids don’t propagate world-space lighting, and it’s not exactly clear if they could ever do that. Tracing rays into an emissive volume and hooking that up to the surface cache is probably a bridge too far for lumen. Likely more than what you needed to hear, but that’s just a bit on it.

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