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1. Real-time content creation with UE4 ray tracing Epic Games Japan / Technical Artist Developer Relations Hiroyuki Kobayashi

2. Ray Tracing in UE4.25 #UE4 | @UNREALENGINE

3. Ray Tracing in UE4.25 Production Ready ! #UE4 | @UNREALENGINE

4. Are you sure it’s okay? #UE4 | @UNREALENGINE

5. I tried to create real-time content using evry ray tracing function of UE4! #UE4 | @UNREALENGINE

6. Example: Train #UE4 | @UNREALENGINE

7. #UE4 | @UNREALENGINE

8. Ray tracing verification ● Ambient Occlusion ● Global Illumination ● Sky Light ● Reflection ● Translucency Verification environment RTX 2080ti Full HD #UE4 | @UNREALENGINE

9. Ray tracing verification Dynamic lighting is important because the train itself keeps moving. Is it okay to move it in the first place? Does the noise increase? #UE4 | @UNREALENGINE

10. Ambient Occlusion #UE4 | @UNREALENGINE

11. Ray Tracing Ambient Occlusion SSAO #UE4 | @UNREALENGINE Ray Tracing

12. Ray Tracing Ambient Occlusion SSAO Ray Tracing High quality and good performance. l though it depends on the resolution, the difference from SSAO is about 1 to 2 ms. #UE4 | @UNREALENGINE

13. What happens when move the train? #UE4 | @UNREALENGINE

14. Ray Tracing Ambient Occlusion What happens when the train moves? When stoped The noise increased a little. #UE4 | @UNREALENGINE When moved

15. Ray Tracing Ambient Occlusion What happens when move the train? Lit There is no problem because it is almost inconspicuous in the Lit mode. #UE4 | @UNREALENGINE Only AO

16. Global Illumination #UE4 | @UNREALENGINE

17. Ray Tracing Global Illumination Summer #UE4 | @UNREALENGINE Winter

18. But... #UE4 | @UNREALENGINE

19. Ray Tracing Global Illumination Looking at the processing load breakdown... #UE4 | @UNREALENGINE

20. Ray Tracing Global Illumination Looking at the processing load breakdown... Sky Light #UE4 | @UNREALENGINE Global Illumination Reflection

21. Ray Tracing Global Illumination Looking at the processing load breakdown... Sky Light #UE4 | @UNREALENGINE Global Illumination Reflection

22. Ray Tracing Global Illumination Looking at the processing load breakdown... Sky Light Global Illumination Reflection About 31ms!! #UE4 | @UNREALENGINE

23. It was heavy... #UE4 | @UNREALENGINE

24. Ray Tracing Global Illumination Brute Force Sample Per Pixel 4 Sky Light #UE4 | @UNREALENGINE Global Illumination Reflection

25. Ray Tracing Global Illumination Type of RTGI ● Brute Force ● Final Gather We can change from post process volume. #UE4 | @UNREALENGINE

26. How’s final gather? #UE4 | @UNREALENGINE

27. Ray Tracing Global Illumination Final Gather Sample Per Pixel 4 #UE4 | @UNREALENGINE

28. Ray Tracing Global Illumination Final Gather Sample Per Pixel 4 About 9ms!! #UE4 | @UNREALENGINE

29. But... #UE4 | @UNREALENGINE

30. Ray Tracing Global Illumination What happens when move the train? Brute Force #UE4 | @UNREALENGINE Final Gather

31. Ray Tracing Global Illumination What happens when move the train? Brute Force Final gather has problems with movemet #UE4 | @UNREALENGINE Final Gather

32. Ray Tracing Global Illumination What happens when move the train? Sample Per Pixel 4 It didn't change much even if I increased the number of samples. #UE4 | @UNREALENGINE Sample Per Pixel 64

33. Try lowering the brute force sample per pixel #UE4 | @UNREALENGINE

34. Ray Tracing Global Illumination Brute Force Sample Per Pixel 1 About 7ms！！ #UE4 | @UNREALENGINE

35. Ray Tracing Global Illumination Brute Force Sample Per Pixel 4 It's cleaner with a higher sample size. But not by much. #UE4 | @UNREALENGINE Sample Per Pixel 1

36. Ray Tracing Global Illumination Brute Force When stoped The noise stands out when you move. But not as much as Final Gather. #UE4 | @UNREALENGINE When moved

37. Ray Tracing Global Illumination Final Gather ● Fast ● Not good at movement Brute Force ● Slow ● not good at movement, but better than final gather #UE4 | @UNREALENGINE

38. Ray Tracing Global Illumination Final Gather ● Fast ● Not good at movement Brute Force Neither of them are good at movement! ● Slow ● not good at movement, but better than final gather #UE4 | @UNREALENGINE

39. What do we do then? #UE4 | @UNREALENGINE

40. Let's adjust the denoiser. #UE4 | @UNREALENGINE

41. Global Illumination Denoiser Denoiser related console commands are also available GI and Sky Light denoisers are common #UE4 | @UNREALENGINE

42. Global Illumination Denoiser r.GlobalIllumination.Denoiser.PreConvolution=2 ● Increasing the value suppresses noise to some extent, but gives an overall vague impression. r.GlobalIllumination.Denoiser.ReconstructionSamples=1 ● Noise jaggies can be suppressed by lowering the value #UE4 | @UNREALENGINE

43. Global Illumination Denoiser Adjust the denoiser PreConvolution=1 PreConvolution=2 ReconstructionSamples＝16 ReconstructionSamples＝1 Even when you move it, it doesn't stand out much! #UE4 | @UNREALENGINE

44. Sky Light #UE4 | @UNREALENGINE

45. Ray Tracing Sky Light Shadow related issues ● Masked material shadow ignores Opacity Mask ● Cast shadow for each material element does not work ● Sky Light looks different in reflection #UE4 | @UNREALENGINE

46. Ray Tracing Sky Light Masked material shadow ignores Opacity Mask Avoid with r.RayTracing.SkyLight.EnableTwoSidedGeometry = 0 Whether to enable shadows for double-sided materials Turn off because the shadows of plants etc. may become too dark #UE4 | @UNREALENGINE

47. Ray Tracing Sky Light Cast shadow for each material element does not work Avoid windowpanes that you do not want to cast shadows by making them separate objects #UE4 | @UNREALENGINE

48. Ray Tracing Sky Light Sky Light looks different in reflection r.RayTracing.Reflections.RayTraceSkyLightContribution=1 Draw skylight shadows in ray tracing reflection It doesn't look exactly the same without denoising, and it gets quite dark. No shadow #UE4 | @UNREALENGINE With shadow

49. Ray Tracing Sky Light What happens when move the train? When stoped Not as much as GI, but still stands out when moving #UE4 | @UNREALENGINE When moved

50. Ray Tracing Sky Light Adjust Denoiser Before adjustment Just like GI, adjust the denoiser to solve the problem! #UE4 | @UNREALENGINE After adjustment

51. Reflection #UE4 | @UNREALENGINE

52. Ray Tracing Sky Light What happens when move the train? When stoped There is a slight increase in noise, but there is almost no problem. #UE4 | @UNREALENGINE When moved

53. Ray Tracing Reflection Many RT Reflections do not look right ● AO ● Global Illumination ● Denoised Sky Light and Soft Shadow ● SubSurface Scattering etc #UE4 | @UNREALENGINE

54. Ray Tracing Reflection Many RT Reflections do not look right #UE4 | @UNREALENGINE

55. Ray Tracing Reflection The shadow of the Two Sided material turns pink #UE4 | @UNREALENGINE

56. Ray Tracing Reflection The shadow of the Two Sided material turns pink Solved by rewriting the shader code! #if MATERIAL_SHADINGMODEL_SUBSURFACE || MATERIAL_SHADINGMODEL_TWOSIDED_FOLIAGE uint ShadingModel = GetMaterialShadingModel(PixelMaterialInputs); if ( ShadingModel == SHADINGMODELID_SUBSURFACE || ShadingModel == SHADINGMODELID_TWOSIDED_FOLIAGE ) { Payload.CustomData = GetMaterialSubsurfaceData(PixelMaterialInputs); } #endif Engine\Shaders\Private\RayTracing\RayTracingMaterialHitShaders.usf Around line 385 #UE4 | @UNREALENGINE

57. Ray Tracing Reflection Before Scheduled to be fixed in 4.26 Thank you Monsyo and Nori! #UE4 | @UNREALENGINE After

58. Ray Tracing Reflection Sky Light shadow is not drawn. Too bright #UE4 | @UNREALENGINE

59. Ray Tracing Reflection Sky Light shadow is not drawn and it is too bright RayTraceSkyLightContribution=1 Before #UE4 | @UNREALENGINE or After

60. Ray Tracing Reflection Sky Light shadow is not drawn and it is too bright RayTraceSkyLightContribution=1 It gets pretty dark, but ... #UE4 | @UNREALENGINE or

61. Ray Tracing Reflection Sky Light shadow is not drawn and it is too bright RayTraceSkyLightContribution=1 or It doesn't bother me so much in lit mode #UE4 | @UNREALENGINE

62. Ray Tracing Reflection Soft shadows can also be selected, but they are rough without denoising #UE4 | @UNREALENGINE

63. Ray Tracing Reflection Soft shadows can also be selected, but they are rough without denoising Distorts normal or is inconspicuous if the material is rough to some extent Reflection #UE4 | @UNREALENGINE Lit

64. Ray Tracing Reflection Soft shadows can also be selected, but they are rough without denoising Distorts Normal or is inconspicuous if the material is rough to some extent Low Roughness #UE4 | @UNREALENGINE High Roughness

65. Ray Tracing Reflection I didn't use it this time, but there is also a reflection-related denoiser option #UE4 | @UNREALENGINE

66. Translucency #UE4 | @UNREALENGINE

67. Ray Tracing Translucency Many RT Reflections and Refraction do not look right ● AO ● Global Illumination ● Denoised Sky Light and Soft Shadow ● SubSurface Scattering etc #UE4 | @UNREALENGINE

68. Ray Tracing Translucency Refraction of RT Translucency There is a lot of information that does not appear accurately, and there is a lot of noise when moving it. #UE4 | @UNREALENGINE

69. Ray Tracing Translucency I didn't use Refraction Turn off Refraction and operate with Max Refraction Rays 1 #UE4 | @UNREALENGINE

70. Ray Tracing Translucency I didn't use Refraction It may be usable if it is about Prop with a small drawing area #UE4 | @UNREALENGINE

71. Ray Tracing Translucency Reflection of RT Translucency Can be used even when Refraction is off #UE4 | @UNREALENGINE

72. Ray Tracing Translucency What happens when move the train? When stoped Like opaque reflection, it doesn't bother you much when you move #UE4 | @UNREALENGINE When moved

73. Ray Tracing Translucency Nvidia RTX Branch https://github.com/NvPhysX/UnrealEngine/tree/RTX-4.25 Translucent drawing is rasterized, and there is also Hybrid Translucency where only the reflective part is ray-traced #UE4 | @UNREALENGINE

74. Ray tracing verification summary ● Ambient Occlusion ● Global Illumination ● Sky Light ● Reflection ● Translucency #UE4 | @UNREALENGINE

75. Ray tracing verification summary Ambient Occlusion ● Excellent quality and performance #UE4 | @UNREALENGINE

76. Ray tracing verification summary Global Illumination ● Slow performance ● Weak to fast movements ● Real-time is also possible by adjusting the denoiser #UE4 | @UNREALENGINE

77. Ray tracing verification summary Sky Light ● Beware of shadow-related issues ● Weak to fast movements, but improved by adjusting the denoiser like GI #UE4 | @UNREALENGINE

78. Ray tracing verification summary Reflection ● Know what isn't exactly reflected in the reflection ● Adjust Normal and Roughness for areas where roughness is noticeable #UE4 | @UNREALENGINE

79. Ray tracing verification summary Translucency ● Know what isn't exactly reflected in Reflection and Refraction ● It may be difficult to use Refraction in a large area ● We can also turn off Refraction and use only Reflection #UE4 | @UNREALENGINE

80. A completely dynamic scene has been created! RTX2080ti 1920 x 1080 About 30fps #UE4 | @UNREALENGINE

81. Let's move the light #UE4 | @UNREALENGINE

82. Lighting with Sun and Sky #UE4 | @UNREALENGINE

83. Sun and Sky Simulate lighting from coordinates and time Sun and Sky documentation https://docs.unrealengine.com/ja/Engine/Rendering/LightingAndShadows/SunSky/index.html #UE4 | @UNREALENGINE

84. Sun and Sky Freely change the time and seasons! * Winter assets are required to create a snowy landscape #UE4 | @UNREALENGINE

85. Example: Jelly Fish #UE4 | @UNREALENGINE

86. #UE4 | @UNREALENGINE

87. Verification content ● Ambient Occlusion ● Global Illumination ● Sky Light ● Translucency ● Reflection #UE4 | @UNREALENGINE

88. Verification content ● Ambient Occlusion ● Global Illumination ● Sky Light ● Translucency ● Reflection #UE4 | @UNREALENGINE Not used this time

89. Why did se reflection for jellyfish? #UE4 | @UNREALENGINE

90. Because I make jellyfish ... ● I want to express a soft sheer feeling like frosted glass ● I want to use DoF #UE4 | @UNREALENGINE

91. Because I make jellyfish ... The internal organs can be seenthrough vaguely I want to reproduce this #UE4 | @UNREALENGINE

92. Translucent verification I want an effect like the Roughness of RT Reflection Roughness 0.0 #UE4 | @UNREALENGINE Roughness 0.25

93. Translucent verification I want an effect like the Roughness of RT Reflection Unfortunately it is not possible with ray tracing translucency #UE4 | @UNREALENGINE

94. Translucent verification I want an effect like the Roughness of RT Reflection If you let the reflection ray penetrate, it will look translucent ...? #UE4 | @UNREALENGINE

95. How to get through Ray #UE4 | @UNREALENGINE

96. Tweak normals in materials #UE4 | @UNREALENGINE

97. Translucent verification Make it translucent using RT Reflection By using the inverted camera vector as the normal ... #UE4 | @UNREALENGINE

98. Translucent verification Make it translucent using RT Reflection Tangent Space Normal needs to be turned off #UE4 | @UNREALENGINE

99. Translucent verification Make it translucent using RT Reflection Ray flies almost in the opposite direction #UE4 | @UNREALENGINE

100. Translucent verification Make it translucent using RT Reflection Roughness and Normal are devised to make it look like frosted glass #UE4 | @UNREALENGINE

101. Translucent verification It looks transparent, but it is actually treated as an opaque reflection It is drawn firmly in Depth #UE4 | @UNREALENGINE

102. Translucent verification It looks transparent, but it is actually treated as an opaque reflection It is drawn firmly in Depth DoF can be used! #UE4 | @UNREALENGINE

103. I was able to express the transparency and DoF I was aiming for! #UE4 | @UNREALENGINE

104. Executable file & project is open to the public Executable file https://drive.google.com/file/d/1N7K9O1vj6ypwsAB_v6m5k4E2RzPmR5A9/view?usp=sharing Project https://drive.google.com/file/d/1nlYv0YoLzNXgeU1sN6BSt5CrB9FKO9M1/view?usp=sharing #UE4 | @UNREALENGINE

105. Is it possible to create real-time content using evry ray tracing function of UE4? #UE4 | @UNREALENGINE

106. Did it! #UE4 | @UNREALENGINE

107. Understand the advantages and disadvantages of ray tracing and use it appropriately for each project #UE4 | @UNREALENGINE

108. Advantages and disadvantages of creating ray tracing content with UE4 Advantages ● Dynamic change in lighting You can easily simulate date and time and seasonal changes by combining with Sun and Sky Can handle lighting on moving objects such as trains and airplanes ● Physical accuracy Reflection and GI are now accurate and dynamic, enabling expressions that were previously difficult ● Iteration speed No need to bake, so of course no Light Map From modeling to checking lighting is much faster #UE4 | @UNREALENGINE

109. Advantages and disadvantages of creating ray tracing content with UE4 Disadvantages ● Processing load It is considerably heavier than the conventional functions, including GI Depending on the scene, even conventional expressions may be able to produce sufficient quality ● Unsupported part There are parts that I am not good at, such as reflection and translucent reflection ● Noise basically increases when movement is added I was moving it late this time, but the GI noise was still severe If it moves faster, another response may be necessary #UE4 | @UNREALENGINE

110. Thank you! #UE4 | @UNREALENGINE