Nightshift editor tooling / available on Fab
Settle the scene. Keep building.
Snap actors, particle systems, splines, and spline meshes to Landscapes, UE 5.8 Mesh Terrain, or intentionally tagged surfaces in one predictable, undoable editor pass.
Editor-only no runtime component no packaged-build cost
New in version 1.1.0
The core snap stays fast and predictable. Version 1.1.0 expands the terrain, content, and control surfaces around it.
Snap to Landscapes and UE 5.8's experimental Mesh Terrain path without forcing a hard Mesh Partition module dependency.
Place Niagara and Cascade emitters from a stable pivot, preserve rotation by default, and skip mesh-only settling passes.
Run actor or spline actions and tune the live searchable settings object from Window -> LandSnap Panel.
Expose opt-in editor commands for deterministic search, dry runs, snapping, and single-line JSON receipts.
Core workflow
Use the default contract for fast passes. Tune only when the scene asks for more control.
Choose actors, particle systems, spline components, or spline mesh components.
Use Only Terrain Surfaces for Landscape and Mesh Terrain, or Only Tagged Surfaces for explicit designer-owned geometry.
Run the actor or spline action, then tune alignment, Z offset, trace distance, or size tiers only if needed.
Predictable by design: terrain and tagged-surface modes are mutually exclusive. Tagged placement is surface-based, not free-form stacking.
Core workflow demo
The video covers the original actor-and-spline workflow. Version 1.1.0 adds Mesh Terrain, particles, the dockable panel, and agent commands described on this page.
Placement coverage
LandSnap keeps each target contract explicit, so fast placement does not turn into surprising placement.
Settle props and spline points against Unreal Landscape with pivot, bounds-bottom, and normal-aligned placement.
Recognize reflected Mesh Partition actors and components without forcing a hard module dependency.
Allow or ignore actor and component tags for roads, meshes, layered placement, and other designer-owned targets.
Place emitters from stable pivots and preserve rotation unless particle normal alignment is intentionally enabled.
Agent workflow / explicit opt-in
LandSnap exposes five Unreal Editor console commands that external MCP-connected agents or automation tools can call. It does not bundle an MCP server, require an AI provider, or store provider keys.
Set LANDSNAP_AGENT_ENABLED=1 in the operating-system environment before Unreal Editor launches to opt in.
> LandSnap.Agent.Status
> LandSnap.Agent.Search
> LandSnap.Agent.SnapSelected
> LandSnap.Agent.SnapSplines
> LandSnap.Agent.SearchAndSnap
> LandSnap.Agent.Search folder=Environment/Rocks max=100
[LandSnapAgent] {"ok":true,"command":"search","query":"","class":"","tags":"","folder":"Environment/Rocks","assetfolder":"","count":1,"matches":[{"score":100,"label":"Rock_01","path":"/Game/Maps/Test.Test:PersistentLevel.Rock_01","class":"StaticMeshActor","folder":"Environment/Rocks","asset_paths":"/Game/Environment/Rocks/SM_Rock_01"}]}
Documentation
The common path is short. Open a section when you need the deeper placement contract.
Plugins/ directory.Requirement: Unreal Engine 5.8 tested. LandSnap is editor-only and does not affect packaged builds.
The dockable panel edits the same settings object used by toolbar, hotkey, and agent commands, so changes apply immediately.
Choose pivot or bounds-bottom placement, optional normal alignment with preserve-yaw, normal push, max slope, Z offset, and configurable trace distances.
Niagara and Cascade actors use stable emitter-pivot placement by default. Rotation is preserved unless particle normal alignment is explicitly enabled.
Snap spline points and spline mesh endpoints individually, with optional surface-normal up-vector alignment and point-count limits for long splines.
Allows Landscape and reflected UE 5.8 Mesh Terrain actors and components as valid snap targets.
Requires matching actor or component tags. Add allow tags, ignore tags, and choose where tag checks are performed.
These modes are mutually exclusive. Tagged mode uses Visibility trace fallback; disabling that fallback also disables tagged-surface mode.
Use convex best-fit alignment or the experimental concave paths for irregular footprints and uneven contact.
The optional bounce pass uses down- and up-traces to close small residual gaps after placement.
Auto and manual size tiers tune trace lift, depth, convex thresholds, push, and bounce limits for different asset scales.
Enable debug line draw, verbose LogLandSnap output, and auto-tier logging to inspect traces and classification decisions.
Very thin meshes, extreme slopes, missing simple collision, or highly concave targets can still need manual tuning. LandSnap favors predictable placement over physical simulation.
Design intent
Terrain, collision, and asset bounds vary. LandSnap uses conservative, size-aware placement heuristics so the common case stays quick, undoable, and easy to reason about.
Available on Fab
LandSnap 1.1.0 targets Unreal Engine 5.8 and stays entirely inside the editor.
