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scenario-unreal-lighting-rendering

Use when lighting or rendering in Unreal Engine 5.8: physical light units and exposure (EV100, lux, lumens), Lumen GI and reflections, MegaLights, virtual shadow maps, sky, fog and clouds, post process and color grading, the path tracer, or Movie Render Graph stills. Triggers: "Lumen is noisy", "MegaLights noise", "the interior is too dark", "light leaks", neon signs, a night or dusk scene, "fireflies", "path tracer vs Lumen", "render a still", EXR settings.

skills/game-engines/unreal/scenario-unreal-lighting-rendering/SKILL.md

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Last checked
Nov 6, 2026

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Repository last updated
Nov 7, 2026
License
MIT

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# Lighting and rendering in Unreal Engine 5.8

Expert lighting in Unreal is a calibrated camera, physical light values, and a renderer that sees
the same scene you do; everything else is art direction layered on top and listed as such. Each step
is proved with a representation view and a number before the lit image is trusted; noise is fixed in
the system that owns it. If a sibling skill named here is missing from your available skills, load
it with `skill_get` (Scenario MCP) or ask the user to install it
(https://github.com/scenario-labs/skills#install); unattended, proceed from tool schemas and flag
the gap.

**REQUIRED BACKGROUND:** scenario-unreal-expert (channels, review loop, 5.8 traps).

**Status (2026-09-24):** [`scripts/ue_light.py`](scripts/ue_light.py) is **not yet run in Unreal**;
200 pure, 65 editor-layer and 20 procedure checks pass offline against a fake `unreal`. First editor