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These shorts come from the full Digital Foundry podcast/interview:
“Inside The Witcher 4 Unreal Engine 5 Tech Demo: CD Projekt RED + Epic Deep Dive Interview.”
Recorded during Unreal Fest 2025, the conversation explores how CD Projekt RED and Epic Games collaborated to build a cutting-edge Unreal Engine 5 tech demo of The Witcher 4 running at 60 FPS with hardware ray tracing on PlayStation 5.

The interview covers:
• Why CDPR switched to Unreal Engine
• How the demo achieves 60 FPS with Hardware Lumen, VSM, RTGI & reflections
• Vegetation breakthroughs, voxel tech, and world creation
• Cross-platform scalability
• Frame-time stability & streaming improvements
• Animation pipelines, cinematography & future UE5 optimizations
• Lessons learned from RedEngine and Cyberpunk 2077
And much more.

Full podcast & original content by Digital Foundry.
Support DF here:
• DF Supporter Program
• DF Merch Store
• Official Digital Foundry YouTube Channel

All credits to:
Digital Foundry, CD Projekt RED, Epic Games, Alex Battaglia, and the full development teams involved in producing the interview and Witcher 4 tech demo.


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