UE Lighting and Raytracing

Realistic Dynamic Lighting

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https://www.youtube.com/watch?v=cywvAq4dAeQ&list=PLM5xJtuLgIuzeGLmqJ5qXadvIykIpG96N&index=24&ab_channel=DevAddict⁠

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Main Parameters: Directional Light, Atmospheric Fog, Expoentital Height Fog, Post Process Volume, Skylight

-Directional light Details:

Light Shafts: Bloom, Distance Field Shadows, (5:20-7:00)

-Speical cloud effect: At Marketplace, download "Dead Hill Landscape 2.0", apply at "Light Function Material">MI_Clouds

Ray Tracing

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https://www.youtube.com/watch?v=wwSs9mdOlA0&list=WL&index=2⁠

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At "Output Log", type "r.raytracing.enablematerials 0"

Add/design light in scene

19:00 to 30:12

1.World Setting, Tick "Force No Precomputed Lighting"

2.Drag light (e.g. "Rect Light", Directional Light) on windows in scene:

Detail: Tick "Cast Ray Tracing Shadows", Set "Movable" at Mobility

3.Drag "Post Process Volume" in scene: for Clean Lighting State and control Ray Tracing performance

Detail: Bloom, Lens Flares, Image Effect : intensity 0, Exposure (min & max EV: 1), Rendering Features (Ray Tracing Ambient Occlusion, Ray Tracing Reflections)

Tick "Infinite Extent (Unbound)", so the effect applies whole set, not just the square area

At "Screen Space Reflection"->Misc , set screen percentage (for better anti-alising if higher %, but heavier on graphic card). So if it's 4k or above image, don't set higher than 150%.

Translucency

30:12 to 33:35

1. Set in "Hirearchy node": "Material", "Transluency-Lightingh Mode" of the props w want to have translucency effect, then leave the Node, drage the "Designed Material" on the props

2. In "Post Process Volume", Detail: Transluency- Tick Type and change to "Ray Tracing"

Render

42:30 to 43:30

If not for realtime raytracing, e.g. movie, set "Post Process Volume" Detail-"Path Tracing" cam control max bounces. And set high quality in movie render queue

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