Overview
Core PCG actor
SubBiome
Spawn and manage spline-driven PCG features
BP_SubBiome generates spline-driven features such as roads, farmlands, and forest strips. A SubBiome can use one spline or multiple splines—for example, a farmland can use separate splines for garden rows. SubBiomes do not require a Biome actor; they generate independently while still supporting clean blending with the surrounding environment.
Spline-driven
Independent generation
Multiple spline support
Clean blending
Actor reference
Details Reference
SubBiome settings are context-specific. The categories and controls you see can change depending on the selected SubBiome type.
Options are context-specific. Different SubBiomes can show different categories, and some sections may be expanded or collapsed depending on the selected asset.
Biome
Biome preset
Data Table
Selects the Data Table that stores the biome presets and their parameters. See Biome Presets.
Row Name
Selects the preset row used by this SubBiome. A SubBiome can provide multiple presets.
Biome Quality
Sets the generation quality level. This affects foliage density, draw distance, WPO, shadow behavior, and global illumination. The documented High preset targets about 80–90 FPS on an RTX 4090 at 4K with 50% Epic scalability. Cinematic uses the same foliage density as High but removes mesh culling. Lowest disables WPO.
Advanced
Runtime Generation
Experimental feature. Generates meshes at runtime instead of storing them in the level, which can significantly reduce loading time.
Spawn Proxy And HLOD
When Runtime Generation is disabled, this reproduces HLOD-style behavior and sends proxies to the HLOD spawner when enabled.
Seed
Changes the procedural result. Different seed values produce different layouts.
Spline
Accuracy
Controls sampling precision along the spline. Increase it when tighter turns or wider rows need to follow the spline more accurately.
Double Resample
Runs an additional resampling pass to smooth the overall spline shape and help reduce knots.
Spawn Options
Garden
Rows
Sets the number of rows generated on one side of the garden center.
Row Distance
Sets the spacing between adjacent rows.
Garden Bed
Enables garden-bed generation.
Border
Enables a border around the garden.
Border Width
Sets the width of the generated border.
Plants
Amount
Controls how many plants are generated.
Distance
Sets the spacing between individual plants.
Scale
Sets the base scale multiplier for plants.
Position Random
Adds random variation to plant positions.
Direction
Sets the general facing direction of the plants.
Direction Random
Adds random variation to plant orientation.
Weed
Controls how many weeds are mixed into the plant rows.
Align to Landscape
Aligns plant meshes to the Landscape surface.
Forest
Strip Width
Sets the width of the forest strip along the spline.
Trees Amount
Controls how densely trees are generated.
Grass Amount
Controls grass density inside the forest strip.
Road
Width
Sets the road width along the spline.
Lift
Raises the road mesh to help prevent terrain clipping.
Separator
Enables the center separator or divider.
Sides
Enables roadside elements such as edges or borders.
Plants Amount
Controls how much vegetation is generated alongside the road.
Controls
Help
Opens the documentation page.
Guides
Switches between minimal and full guide visualization.
Clear
Removes the PCG logic and converts the generated biome meshes into Instanced Static Mesh Components.
Spawn
Generates the SubBiome.
Remove
Removes the generated SubBiome.
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