UE5 Level Design

World building, environment art, lighting, landscape, gameplay spaces, and level streaming in Unreal Engine 5.

Infrastructure

See the ue5-gamedev skill for full infrastructure details.

Channel	Endpoint	Use for level design
Remote Control API	localhost:8080	Actor placement, property tweaking, lighting adjustments
Python bridge	localhost:30010	Batch operations, procedural placement, asset management
MCP (ChiR24/Unreal_mcp)	Local plugin	Actor creation, level management, lighting control

Level structure

Level organization

/Game/Maps/
  MainLevel.umap              -- Persistent level
  MainLevel_Gameplay.umap     -- Gameplay actors (streaming)
  MainLevel_Lighting.umap     -- Lights and post-process (streaming)
  MainLevel_Audio.umap        -- Ambient audio (streaming)
  MainLevel_Foliage.umap      -- Foliage and vegetation (streaming)

World Partition (UE5 preferred)

For open worlds, use World Partition instead of manual level streaming:

• Data Layers: Organize actors into logical layers (Gameplay, Environment, Audio)
• Runtime Grid: Controls streaming granularity (cell size, loading range)
• One File Per Actor (OFPA): Each actor is its own file -- enables parallel work
• HLODs: Hierarchical LODs for distant rendering
• Minimap: World Partition generates a grid-based minimap for the editor

Sub-levels (classic approach)

For linear or contained levels:

• Use Level Streaming Volumes for automatic loading
• Use ULevelStreamingDynamic for code-driven streaming
• Keep persistent level minimal (only always-loaded actors)

Actor placement

Via Remote Control API

# Spawn an actor at a location
PUT http://localhost:8080/remote/object/call
{
  "objectPath": "/Script/Engine.Default__GameplayStatics",
  "functionName": "BeginDeferredActorSpawnFromClass",
  "parameters": {
    "WorldContextObject": "/Game/Maps/MainLevel.MainLevel",
    "ActorClass": "/Game/Blueprints/BP_Torch.BP_Torch_C",
    "SpawnTransform": {
      "Translation": { "X": 1000, "Y": 500, "Z": 0 },
      "Rotation": { "X": 0, "Y": 0, "Z": 45, "W": 1 },
      "Scale3D": { "X": 1, "Y": 1, "Z": 1 }
    }
  }
}

Via Python bridge

import unreal

editor = unreal.EditorLevelLibrary()

# Spawn from Blueprint class
bp_class = unreal.EditorAssetLibrary.load_blueprint_class("/Game/Blueprints/BP_Torch")
location = unreal.Vector(1000, 500, 0)
rotation = unreal.Rotator(0, 45, 0)
actor = editor.spawn_actor_from_class(bp_class, location, rotation)

# Batch place actors along a path
import math
for i in range(20):
    angle = (i / 20) * 2 * math.pi
    x = math.cos(angle) * 2000
    y = math.sin(angle) * 2000
    loc = unreal.Vector(x, y, 0)
    editor.spawn_actor_from_class(bp_class, loc, unreal.Rotator(0, 0, 0))

Via MCP (ChiR24/Unreal_mcp)

The MCP server provides higher-level actor management:

• Create actors by type (cube, sphere, light, camera, custom Blueprint)
• Set transforms (position, rotation, scale)
• Query and find actors by name or class
• Delete actors
• Manage actor hierarchies

Landscape

Landscape setup

• Component size: 63x63 or 127x127 quads (63 for smaller levels, 127 for large)
• Sections per component: 1x1 (small) or 2x2 (large worlds)
• Scale: Default 100x100x256 (X/Y/Z). For realistic terrain, Z scale of 51200 = ~500m height range
• Material: Use landscape-specific material with layer blending

Landscape layers

import unreal

# Create landscape material layers via Python
landscape = unreal.EditorLevelLibrary.get_all_level_actors_of_class(unreal.Landscape)[0]

# Sculpt operations use the Landscape Editor mode
# For automation, modify heightmap data directly:
# Export: Right-click landscape > Export to file (.r16 or .png)
# Import: Landscape > Import heightmap

Foliage

• Use Procedural Foliage Volume for large-area automatic placement
• Use Foliage Painting for manual detail placement
• Use Nanite for high-poly foliage (UE5.1+): enable Nanite on foliage static meshes
• Grass types: Use Landscape Grass Type for lightweight ground cover (rendered per-component)

Lighting

Light types and when to use them

Light	Use case	Cost
Directional Light	Sun/moon, outdoor scenes	Low (one per level)
Sky Light	Ambient fill, sky color	Low (one per level)
Point Light	Lamps, torches, small areas	Medium
Spot Light	Flashlights, focused beams	Medium
Rect Light	Windows, screens, area sources	High

Lumen (UE5 default GI)

• Lumen Global Illumination: Real-time indirect lighting. No lightmap baking needed.
• Lumen Reflections: Real-time reflections replacing SSR + planar reflections.
• Hardware Ray Tracing: Enable for higher quality (requires RTX GPU).
• Software Ray Tracing: Fallback that works without RTX. Lower quality but no hardware requirement.

Lighting via Remote Control

# Adjust directional light intensity
PUT http://localhost:8080/remote/object/property
{
  "objectPath": "/Game/Maps/MainLevel.MainLevel:PersistentLevel.DirectionalLight_0.LightComponent0",
  "propertyName": "Intensity",
  "propertyValue": { "Intensity": 8.0 }
}

# Change light color
PUT http://localhost:8080/remote/object/property
{
  "objectPath": "/Game/Maps/MainLevel.MainLevel:PersistentLevel.PointLight_0.LightComponent0",
  "propertyName": "LightColor",
  "propertyValue": { "LightColor": { "R": 255, "G": 180, "B": 100, "A": 255 } }
}

Lighting via Python

import unreal

editor = unreal.EditorLevelLibrary()

# Spawn a point light
light = editor.spawn_actor_from_class(
    unreal.PointLight,
    unreal.Vector(500, 0, 300),
    unreal.Rotator(0, 0, 0)
)
light_comp = light.get_component_by_class(unreal.PointLightComponent)
light_comp.set_intensity(5000)
light_comp.set_light_color(unreal.LinearColor(1.0, 0.7, 0.4, 1.0))
light_comp.set_attenuation_radius(1000)

Post-processing

Post Process Volume settings

Key properties to control via Remote Control or Python:

• Exposure: Min/Max EV100, metering mode, exposure compensation
• Bloom: Intensity, threshold, size
• Color grading: Temperature, tint, saturation, contrast, gamma, gain (per shadows/midtones/highlights)
• Ambient occlusion: Intensity, radius, bias
• Depth of field: Focal distance, aperture (f-stop), near/far transition
• Motion blur: Amount, max velocity
• Tone mapping: Film slope, toe, shoulder

Environment

• Sky Atmosphere: Realistic atmospheric scattering. One per level.
• Volumetric Clouds: GPU-driven cloud rendering. Configure coverage, density, shape.
• Exponential Height Fog: Distance fog with directional inscattering.
• Ultra Dynamic Sky (marketplace): Popular all-in-one sky/weather solution.

Performance guidelines

• Draw calls: Keep under 2000 for 60fps. Use instanced static meshes for repeated geometry.
• Nanite: Enable for complex static meshes. Automatic LOD with virtualized geometry.
• Virtual Shadow Maps: UE5 default. Handles large worlds well but costs VRAM.
• Occlusion: Use precomputed visibility volumes in indoor areas.
• LODs: Auto-generate via mesh editor for non-Nanite meshes.
• Texture streaming: Use virtual textures for large landscapes.
• Profiling: Use stat unit, stat gpu, stat scenerendering console commands. ProfileGPU (Ctrl+Shift+,) for per-pass timings.

Collision and navigation

• Collision: Use simple collision (boxes, spheres, capsules) over complex collision where possible
• NavMesh: Place a NavMeshBoundsVolume to enable AI pathfinding. Configure agent radius/height.
• Navigation modifiers: Use NavModifierVolume to mark areas (avoid, prefer, custom)
• RecastNavMesh: Default navmesh system. Configure cell size, agent parameters.

File and asset conventions

/Game/
  Maps/              -- Level files
  Blueprints/        -- Blueprint actors
  Environment/
    Meshes/          -- Static meshes
    Materials/       -- Material instances
    Textures/        -- Texture assets
  Lighting/
    LightProfiles/   -- IES profiles
    HDRIs/           -- Sky/environment maps
  FX/                -- Niagara particle systems
  Audio/
    Ambient/         -- Environmental audio
    SFX/             -- Sound effects

Workflow

1. Block out: Place BSP brushes or simple meshes to define spaces
2. Gameplay test: Verify scale, sightlines, flow with placeholder actors
3. Art pass: Replace blockout with final meshes and materials
4. Lighting pass: Set up lights, sky, post-processing
5. Polish: Foliage, decals, particles, audio
6. Optimize: Profile, add LODs, configure streaming, set culling distances