Inside The Witcher 4 Unreal Engine 5 Tech Demo: CD Projekt RED + Epic Deep Dive Interview
Unreal Fest 2025 kicked off in spectacular style with a stunning demonstration of The Witcher 4 content running in a new Unreal Engine 5 demo, showcasing key advancements made for the technology - and all running on a standard PlayStation 5 with hardware RT at 60fps. Alex visited CD Projekt RED's studio in Warsaw for a deep dive interview with CDPR and Epic, discussing the creation of the demo with some of the key people who made it.Join the DF Supporter Program for pristine video downloads, behind the scenes content, early access to new videos, early access to DF Direct Weekly and much, much more: https://bit.ly/3jEGjvx
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00:00:00 Introduction
00:01:36 When did the cooperation begin for the TW4 Tech Demo?
00:02:47 Why did CDPR switch to Unreal Engine?
00:04:11 Why target and show the demo on PlayStation 5 at 60 fps?
00:06:20 60 FPS: a challenge or a limitation?
00:07:33 How was Hardware Lumen brought up to 60 fps on console?
00:08:36 Why use hardware ray tracing when the software path already exists and ran better?
00:10:52 What affect does RTGI and Reflections have on Art Design?
00:11:57 How does Lumen affect cinematic design?
00:13:36 How was the world and terrain created for this demo?
00:15:31 How did the team view the paradigm shift in how vegetation is made?
00:19:50 Can the new vegetation technology be used elsewhere?
00:21:20 How is the new voxel technology lit and shaded?
00:22:56 How was Virtual Shadow Maps brought up to 60 fps for this demo?
00:24:44 How was the demo's "flawless" frame-time achieved?
00:27:40 Can UE5 have flawless cutscenes on all platforms?
00:30:32 Where do frame-time issues usually occur in UE5 projects?
00:32:38 Will UE5 ever be rid of the "render thread" or "game thread"?
00:33:53 How was RedEngine designed and what is its affect on how CDPR uses UE5?
00:36:45 How would CDPR potentially scale the graphics beyond PS5?
00:38:49 How would CDPR potentially scale the graphics below PS5?
00:39:27 How did RedEngine manage PSOs?
00:41:24 What is a moment or aspect of the project which you are particularly proud of?
00:47:50 Conclusion Receive SMS online on sms24.me
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