Lighting Test for Unreal Engine 5

The goal is lighting has correctness and neutral.
Engine Users would be able to use these test scenes to verify that the lighting is correct and neutral for the various Unreal Engine rendering methods.

• Lumen
  • Hardware Ray Tracing (HWRT)
  • Software Ray Tracing (SWRT)
• Screen Space Reflection (SSR)
• Screen Space Global Illumination (SSGI)

Default Settings

Rendering

• Global Illumination use Lumen
• Reflection use Lumen
• Use Hardware Ray Tracing when available

Preparation

Disable Post Processing on Project Settings

Disable All Post Processing on Editor

Disable Game Setting on Editor

References

• NVIDIA Falcor 5.2 Custom Mogwai
  • Script Falcor/Source/Mogwai/Data/PathTracer.py
  • Tonemap is Linear
• Test Scenes: References/Scenes

Scenes

• Unreal Engine 5.0.3
• There are 4 test scenes
  1. Perfect Lambert Plane
  2. Perfect MirrorPlane
  3. Perfect Mirror Weak White Plane
  4. Glossy Plane

1. Perfect Lambert Plane

Reference	Lumen	Path Tracing (UE5)

• UE5 - Content/Maps/Test_PerfectLambert_Sphere.umap
• Reference - References/Scenes/test_sphere_perfect_lambert.pyscene

Directional Light

Property	Value
Intensity	10 [lux]
Rotation	(0, -90, 0) [degree]

Sphere Material

Property	Value
Base Color	(1, 0, 0)
Metalness	0.0
Specular Roughness	1.0

Plane Material

Property	Value
Base Color	(1, 1, 1)
Metalness	0.0
Specular Roughness	1.0

2. Perfect Mirror Plane

Reference	Lumen	Path Tracing (UE5)
	This looks like mix in diffuse(base color) to mirror plane...	UE5 Path Tracing is also same result...

• UE5 - Content/Maps/Test_PerfectMirror_Sphere.umap
• Reference - References/Scenes/test_sphere_perfect_mirror.pyscene

Directional Light

Property	Value
Intensity	10 [lux]
Rotation	(0, -90, 0) [degree]

Sphere Material

Property	Value
Base Color	(1, 0, 0)
Metalness	0.0
Specular Roughness	1.0

Plane Material

Property	Value
Base Color	(1, 1, 1)
Metalness	1.0
Specular Roughness	0.0

3. Perfect Mirror Weak White Plane

Reference	Lumen	Path Tracing (UE5)
	Making Base Color as close to black as possible will bring you closer to the reference image. However, the reflection of the floor will also be weakened...	UE5 Path Tracing is also same result...

• UE5 - Content/Maps/Test_PerfectMirror_WeakWhite_Sphere.umap
• Reference - References/Scenes/test_sphere_perfect_mirror_base_color_weak_white.pyscene

Directional Light

Property	Value
Intensity	10 [lux]
Rotation	(0, -90, 0) [degree]

Sphere Material

Property	Value
Base Color	(1, 0, 0)
Metalness	0.0
Specular Roughness	1.0

Plane Material

Property	Value
Base Color	(0.1, 0.1, 0.1)
Metalness	1.0
Specular Roughness	0.0

4. Glossy Plane

Reference	Lumen	Path Tracing (UE5)
		Plane is dark less than Lumen result...

• UE5 - Content/Maps/Test_Glossy_Sphere.umap
• Reference - References/Scenes/test_sphere_glossy_plane.pyscene

Directional Light

Property	Value
Intensity	10 [lux]
Rotation	(0, -90, 0) [degree]

Sphere Material

Property	Value
Base Color	(1, 0, 0)
Metalness	0.0
Specular Roughness	1.0

Plane Material

Property	Value
Base Color	(1, 1, 1)
Metalness	0.8
Specular Roughness	0.2

TODO

• Image Based Lighting Tests
• Lighting Complex Scene Tests
• Real-Time Lighting with Dynamic Physics Rigid Body Objects