▸case-21 In a dynamic outdoor directional light setup using Cascaded Shadow Maps (CSM), soft shadow edges show perspective aliasing near the camera. How should cascade split distances be calculated using logarithmic distribution? | pass→pass | 14,952 | 17,192 | +15% | 1 | 1 | 0% | 2,638 | 3,000 | +14% | 0 | 0 | — |
▸case-07 In Unreal Engine 5, high-detail dynamic GI lighting on complex geometry looks dark or updates slowly when Lumen is active. The developer attempts to solve this by turning off mesh distance fields. Explain what component Lumen uses to capture surface material properties for GI bounce lighting. | pass→pass | 18,039 | 10,982 | -39% | 1 | 1 | 0% | 1,822 | 1,820 | -0% | 0 | 0 | — |
▸case-01 In Unreal Engine 5, a developer needs to render a fully static architectural visualization scene with precomputed bounce lighting on architectural walls. They are considering using dynamic shadow maps for all walls to save disk space. Provide the optimal lighting pipeline recommendation for maximum bounce quality. | pass→pass | 21,372 | 22,319 | +4% | 1 | 1 | 0% | 3,196 | 2,402 | -25% | 0 | 0 | — |
▸case-02 When preparing a 3D asset in Blender for static lightmap baking in Unity, the artist asks whether the main texturing UV channel (channel 0) can be reused directly even if UV islands overlap. Explain the UV layout rule for lightmapping. | pass→pass | 18,300 | 11,833 | -35% | 1 | 1 | 0% | 2,051 | 2,013 | -2% | 0 | 0 | — |
▸case-03 A mobile game targeting mid-range devices needs realistic indirect room lighting without runtime GPU evaluation costs. The team plans to evaluate screen-space ray marching at runtime. Suggest the zero-runtime-cost alternative. | pass→pass | 9,349 | 12,572 | +34% | 1 | 1 | 0% | 1,336 | 1,241 | -7% | 0 | 0 | — |
▸case-04 During lightmap baking in Maya/Arnold, visible light bleeding and seams appear along hard edges of modular wall pieces. The artist wants to fix this purely by increasing dynamic light intensity. What is the correct configuration fix? | pass→pass | 17,268 | 18,498 | +7% | 1 | 1 | 0% | 1,892 | 1,966 | +4% | 0 | 0 | — |
▸case-05 In an RTX GI implementation using DDGI (Dynamic Diffuse Global Illumination), dynamic objects inside a cavern experience light leak through thin walls. The developer wants to disable probes entirely. What probe parameter or technique mitigates light leakage? | pass→pass | 11,739 | 17,350 | +48% | 1 | 1 | 0% | 1,847 | 1,883 | +2% | 0 | 0 | — |
▸case-06 When storing indirect radiance per probe in a DDGI grid for real-time ray-traced bounce lighting, how is directional indirect irradiance compactly represented per probe location? | pass→pass | 20,917 | 12,963 | -38% | 1 | 1 | 0% | 2,509 | 2,038 | -19% | 0 | 0 | — |
▸case-08 A graphics engineer working on a high-end PC title in UE5 needs Lumen to capture indirect reflections on detailed non-displaced skeletal meshes and high-poly geometry. Software ray tracing (Mesh Distance Fields) is currently failing to represent detailed geometry. Which Lumen mode should be enabled? | pass→pass | 12,241 | 11,606 | -5% | 1 | 1 | 0% | 1,129 | 1,128 | -0% | 0 | 0 | — |
▸case-09 A renderer implements screen-space global illumination (SSGI) using depth buffer ray marching. When the camera tilts downward, bright indirect lighting from overhead lights abruptly disappears. The team suspects a light intensity bug. What is the fundamental cause and standard fallback? | pass→pass | 18,735 | 15,755 | -16% | 1 | 1 | 0% | 1,767 | 1,775 | +0% | 0 | 0 | — |
▸case-10 An indie game developer is implementing real-time SSGI in a custom WebGL engine and suffers severe GPU frame drops during depth buffer ray tracing. They plan to fix it by switching to 4K lightmap textures. What screen-space tracing optimization maintains real-time performance? | pass→pass | 17,892 | 18,595 | +4% | 1 | 1 | 0% | 2,164 | 2,144 | -1% | 0 | 0 | — |
▸case-11 In a deferred rendering engine using SSGI, noise artifacts become severe on high-roughness diffuse surfaces. The graphics programmer wants to increase ray count per pixel to 64. What standard performance threshold optimization is preferred? | pass→pass | 16,816 | 16,442 | -2% | 1 | 1 | 0% | 1,833 | 2,250 | +23% | 0 | 0 | — |
▸case-12 A dynamic character walks through a statically lit interior scene with baked lightmaps. The character appears completely flat and unlit by ambient bounces. The developer wants to mark the dynamic character as static. What structure should be placed in the scene to light dynamic objects? | pass→pass | 7,610 | 6,998 | -8% | 1 | 1 | 0% | 1,055 | 1,075 | +2% | 0 | 0 | — |
▸case-13 When a dynamic vehicle moves between dynamic light probes in Unity, lighting pops abruptly from dark to light. The artist suggests creating separate dynamic light sources attached to the vehicle. What light probe sampling configuration solves this continuous motion issue? | fail→pass | 11,087 | 19,360 | +75% | 1 | 1 | 0% | 1,777 | 1,923 | +8% | 0 | 0 | — |
▸case-14 In a level with dramatic transitions between dark corridors and bright sunlit courtyards, light probes spaced 10 meters apart cause dynamic objects to glow inside dark entrances. What is the correct probe layout adjustment? | pass→pass | 7,934 | 15,120 | +91% | 1 | 1 | 0% | 1,091 | 1,449 | +33% | 0 | 0 | — |
▸case-15 A baked lightmap workflow correctly captures indirect diffuse lighting on walls, but polished chrome metal objects in the room appear completely matte grey. The artist tries increasing lightmap resolution on the metal object. What technique complements lightmaps for specular reflections? | pass→pass | 7,188 | 8,784 | +22% | 1 | 1 | 0% | 1,081 | 1,261 | +17% | 0 | 0 | — |
▸case-16 In a custom DDGI implementation, rapid movement of lights causes noticeable ghosting in indirect lighting probe grids. The graphics programmer wants to disable light probe updates completely. What temporal blending factor controls this trade-off between lag and noise? | pass→pass | 14,884 | 10,083 | -32% | 1 | 1 | 0% | 1,684 | 1,726 | +2% | 0 | 0 | — |
▸case-17 When running Lumen with Software Ray Tracing in Unreal Engine 5, complex foliage models display inaccurate indirect bounce lighting. The author proposes enabling global lightmass baking on all trees. What underlying Lumen representation needs adjustment for thin foliage geometry? | pass→pass | 21,833 | 18,989 | -13% | 1 | 1 | 0% | 2,492 | 2,148 | -14% | 0 | 0 | — |
▸case-18 Screen-space GI outputs low ray counts per pixel due to frame rate budgets, creating heavy Monte Carlo noise. How do modern real-time engines clean up this noise without increasing per-frame ray samples? | pass→pass | 26,786 | 23,655 | -12% | 1 | 1 | 0% | 3,346 | 2,968 | -11% | 0 | 0 | — |
▸case-19 A open-world game features fully destruction-capable buildings and dynamic time-of-day. The team is deciding whether to bake 8K lightmap textures for all building interiors. Advise them on why lightmaps fail in this scenario. | pass→pass | 13,628 | 20,793 | +53% | 1 | 1 | 0% | 2,004 | 2,399 | +20% | 0 | 0 | — |
▸case-20 A shader programmer is implementing microfacet specular reflection for direct light sources using the Cook-Torrance BRDF model in GLSL. How should the GGX normal distribution function (NDF) be calculated for direct sun highlights? | pass→pass | 15,894 | 16,839 | +6% | 1 | 1 | 0% | 3,117 | 2,627 | -16% | 0 | 0 | — |
▸case-22 A post-processing engineer needs to implement an ACES tonemapping curve and Gaussian blur bloom filter for bright pixels exceeding 1.0 HDR range. Detail the threshold extraction pass for bloom. | pass→pass | 24,565 | 21,604 | -12% | 1 | 1 | 0% | 3,322 | 3,873 | +17% | 0 | 0 | — |