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name: unreal-lumen description: Unreal Engine Lumen skill for global illumination, reflections, and dynamic lighting. allowed-tools: Read, Grep, Write, Bash, Edit, Glob, WebFetch graph: domains: [domain:gaming] specializations: [specialization:game-development] skillAreas: [skill-area:graphics-rendering, skill-area:game-engines] roles: [role:game-developer]

Unreal Lumen Skill

Lumen global illumination and reflections for Unreal Engine.

Overview

This skill provides capabilities for implementing Lumen dynamic global illumination and reflections in Unreal Engine.

Capabilities

Global Illumination

• Configure Lumen GI settings
• Handle final gather
• Manage infinite bounces
• Optimize trace settings

Reflections

• Configure reflection method
• Handle screen traces
• Manage reflection captures
• Optimize quality settings

Integration

• Combine with Nanite
• Handle emissive materials
• Manage sky light
• Configure exposure

Performance

• Hardware ray tracing option
• Software ray tracing fallback
• Scene complexity handling
• Platform scalability

Prerequisites

• Unreal Engine 5.0+
• Modern GPU (RTX for HW RT)

Usage Patterns

Project Settings

Lumen Global Illumination:
- Enable in Project Settings
- Configure final gather quality
- Set trace distance
- Configure scene detail

Post Process Volume

1. Add Post Process Volume
2. Enable Infinite Extent
3. Configure Lumen settings
4. Adjust quality per area

Best Practices

1. Use emissive for small lights
2. Keep scenes well-lit
3. Avoid very dark areas
4. Profile with Lumen visualizations
5. Test SW and HW ray tracing

References

• Lumen Documentation