Ray Tracing in UE 4.23
summary
Unreal Engine adds production-ready ray tracing in 4.23 built on DXR and the refactored RHI, shipping features from 4.22 used to make the “Troll” demo; real-time runs at 24 fps on a single 2080 Ti and shows one order of magnitude performance gain over earlier prototypes. New pieces: intersection and callable shaders, denoiser and sampling improvements, landscape/instances and World Position Offset support, low-level multi‑GPU control, and a path‑tracer reference; Fortnite cinematics and artists adopt it successfully for shadows, reflections and GI.
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chapters (22)
- 0:00Intro
- 0:24Agenda
- 4:00Goals of 'Troll
- 5:402019 1 NVIDIA RTX 2080 Ti
- 6:21Prototype
- 10:11What is new in 4.23
- 18:07Technical Outline
- 18:51RHI Layer: Geometry Instance
- 20:20RHI Layer: Shaders
- 21:27RHI Layer: Pipeline Analog to graphics and compute PSOS One RT PSO for all shaders
- 22:09RHI Layer: Shader Binding Table
- 24:12Mesh Pipeline Supported Geometry
- 25:16Mesh Pipeline: Extending Geometry
- 25:58Mesh Pipeline: Special Considerations
- 27:14Render Passes: Shadows
- 28:30Render Passes: Ambient Occlusion
- 29:27Shadow Improvements
- 30:28Render Passes: Reflection
- 31:46Render Passes: Translucency
- 35:28Path Tracing
- 36:54Ray tracing with Fortnite Cinematics
- 38:36What is Next
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