Box

Structural blockout

Solid blockHollow roomInner floorEditable cells

The Box is the general blockout solid and the only shape that owns the hollow-room workflow.

Parameter details

Parameter / area	Current behavior
Is Hollow	Is Hollow creates a room/container form instead of a solid block.
Hollow Thickness	Hollow Thickness controls wall thickness around the interior.
Inner Floor Height raises only the hollow interior floor so shallow boxes keep visible inner side walls	Inner Floor Height raises only the hollow interior floor so shallow boxes keep visible inner side walls.
Subdivisions	Subdivisions is an X/Y/Z vector used for editable cell sizing and face workflow granularity.
The face API	The face API exposes the six outer faces plus the hollow inner floor when hollow is enabled.

Use it when: use it for rooms, covers, platforms, blockout masses, hollow pits, and quick face-drag prototyping.

Wall

Structural blockout

Straight wallDoor openingsWindow openingsEnd snapping

The Wall is a purpose-built partition actor with length, height, thickness, and opening arrays.

Parameter details

Parameter / area	Current behavior
Wall Length, Wall Height, and Wall Thickness replace the generic dimensions workflow	Wall Length, Wall Height, and Wall Thickness replace the generic dimensions workflow.
Door Openings create zero-sill cutouts using Center X, Width, Height, and Bottom Height	Door Openings create zero-sill cutouts using Center X, Width, Height, and Bottom Height.
Window Openings use the same struct but keep a sill height	Window Openings use the same struct but keep a sill height.
Has Window Cutout offers a fast centered window without adding array elements	Has Window Cutout offers a fast centered window without adding array elements.
Snap points sit on the wall ends so wall segments connect end-to-end	Snap points sit on the wall ends so wall segments connect end-to-end.

Use it when: use it for room walls, hallway blockers, cover partitions, window prototypes, and doorway planning.

Floor / Platform

Structural blockout

Playable slabBorder lipFloor gapsCell height offsets

The Floor actor is a horizontal slab optimized for playable surfaces, holes, borders, and editable top cells.

Parameter details

Parameter / area	Current behavior
Floor Length, Floor Width, and Floor Thickness define the slab directly	Floor Length, Floor Width, and Floor Thickness define the slab directly.
Has Border	Has Border adds a raised perimeter lip with Border Height and Border Thickness.
Floor Gaps cut rectangular holes through the slab	Floor Gaps cut rectangular holes through the slab.
Subdivisions X/Y expose individual top cells for per-cell height offsets	Subdivisions X/Y expose individual top cells for per-cell height offsets.
Sub Quad Height Offsets can raise cells or cut a cell through when pushed below the slab thickness	Sub Quad Height Offsets can raise cells or cut a cell through when pushed below the slab thickness.

Use it when: use it for floors, balconies, roof decks, platforms, modular tiles, and gameplay holes.

Wedge / Ramp

Structural blockout

Single rampFlipped rampDouble-slope roofSlope face edit

The Wedge is a triangular-prism ramp with optional slope direction changes.

Parameter details

Parameter / area	Current behavior
Flip Slope reverses the high and low ends of the ramp	Flip Slope reverses the high and low ends of the ramp.
Double Slope raises both front and back edges into a peaked roof form	Double Slope raises both front and back edges into a peaked roof form.
The editable face set	The editable face set is bottom, back, two sides, and slope.
Dragging the slope	Dragging the slope changes rise while preserving the ramp footprint.

Use it when: use it for ramps, roof silhouettes, sloped cover, terrain placeholders, and simple directional movement tests.

Cylinder

Radial and curved forms

Solid cylinderTapered bodyInner gapCap ringsTube path

The Cylinder builds solid or annular round forms and owns cap decoration rings.

Parameter details

Parameter / area	Current behavior
Radius, Top Radius, and Height define cylinder, tapered cylinder, and cone-like bodies	Radius, Top Radius, and Height define cylinder, tapered cylinder, and cone-like bodies.
Sides, Height Segments, and Cap Radial Segments control tessellation and cap UV stability	Sides, Height Segments, and Cap Radial Segments control tessellation and cap UV stability.
Enable Inner Gap cuts a center hole using Inner Gap Radius	Enable Inner Gap cuts a center hole using Inner Gap Radius.
Ring Count, Ring Width, Ring Height, Ring Inner Radius, Ring Outer Radius, and Ring Surface add raised or recessed cap rings	Ring Count, Ring Width, Ring Height, Ring Inner Radius, Ring Outer Radius, and Ring Surface add raised or recessed cap rings.
Material Slot 2 appears only while Ring Count	Material Slot 2 appears only while Ring Count is greater than zero and drives all decorative rings.
Path Points can turn the cylinder into a multi-segment tube path with editable point handles	Path Points can turn the cylinder into a multi-segment tube path with editable point handles.

Use it when: use it for pillars, drums, round platforms, circular vents, ringed pads, and simple path tubes.

Cone

Radial and curved forms

ConePyramid blendFlipped verticalHorizontal coneEditable tip

The Cone inherits the radial cylinder base but exposes cone-focused size and orientation controls.

Parameter details

Parameter / area	Current behavior
Cone Radius, Cone Height, Cone Sides, Cone Height Segments, and Cone Cap Radial Segments	Cone Radius, Cone Height, Cone Sides, Cone Height Segments, and Cone Cap Radial Segments are the visible cone controls.
Pyramid Amount blends the cone toward a low-sided pyramid profile	Pyramid Amount blends the cone toward a low-sided pyramid profile.
Pyramid Sides sets the target side count for pyramid forms; 4	Pyramid Sides sets the target side count for pyramid forms; 4 creates a square pyramid.
Flip Vertically points the tip in the opposite direction along the active axis without turning the mesh inside-out	Flip Vertically points the tip in the opposite direction along the active axis without turning the mesh inside-out.
Flip Horizontally lays the cone along the local X axis instead of local Z	Flip Horizontally lays the cone along the local X axis instead of local Z.
The tip	The tip is selectable in face editing so dragging it changes size along the tip direction.

Use it when: use it for markers, spikes, arrows, roof cones, hazards, and directional prototypes.

Sphere

Radial and curved forms

Full sphereHemisphereSmooth normalsRing/segment density

The Sphere is a smooth round primitive that can become a dome/hemisphere.

Parameter details

Parameter / area	Current behavior
Radius	Radius controls the whole shape.
Rings and Segments control latitude and longitude tessellation	Rings and Segments control latitude and longitude tessellation.
Is Hemisphere	Is Hemisphere builds only the top dome and adds a flat bottom face.
Normals	Normals are generated smooth automatically; there is no Smooth Normals parameter.

Use it when: use it for domes, collision markers, round props, arena volumes, and soft placeholder masses.

Column / Pillar

Radial and curved forms

Shaft onlyBaseCapitalRadius face edits

The Column combines a shaft with optional base and capital so structural pillars do not need stacked actors.

Parameter details

Parameter / area	Current behavior
Shaft Radius, Column Height, and Sides define the central post	Shaft Radius, Column Height, and Sides define the central post.
Has Base reveals Base Radius and Base Height	Has Base reveals Base Radius and Base Height.
Has Capital reveals Capital Radius and Capital Height	Has Capital reveals Capital Radius and Capital Height.
The face API	The face API exposes top, bottom, and side/radius edits.

Use it when: use it for structural supports, decorative pillars, cover posts, ruins, and modular architecture blocking.

Pipe / Tube

Radial and curved forms

Vertical tubeHorizontal tubeCapped endsOpen pipeMulti-segment path

The Pipe is a dedicated hollow tube actor. It overlaps with Cylinder inner-gap use, but keeps pipe-specific wall and cap controls.

Parameter details

Parameter / area	Current behavior
Outer Radius and Pipe Thickness define the outer wall and inner radius directly	Outer Radius and Pipe Thickness define the outer wall and inner radius directly.
Pipe Length and Horizontal choose vertical or horizontal orientation	Pipe Length and Horizontal choose vertical or horizontal orientation.
Capped Ends seals the tube when a closed pipe	Capped Ends seals the tube when a closed pipe is needed.
Use Separate Cap Material enables a cap material slot independent from side walls	Use Separate Cap Material enables a cap material slot independent from side walls.
Face Material Overrides and Assign/Clear Material Override functions support face-level material assignment	Face Material Overrides and Assign/Clear Material Override functions support face-level material assignment.
Path Points can build a multi-segment tube	Path Points can build a multi-segment tube.

Use it when: use it when pipe wall thickness, capped ends, or pipe-specific face materials matter more than cylinder cap rings.

Arch

Radial and curved forms

ArchwayTunnel segmentPartial arcFull circular arcLeg height

The Arch creates an archway or tunnel segment from radius, wall thickness, depth, and leg height.

Parameter details

Parameter / area	Current behavior
Inner Radius and Wall Thickness define the opening and surrounding shell	Inner Radius and Wall Thickness define the opening and surrounding shell.
Arc Angle	Arc Angle supports partial arcs through full circular arcs.
Segments	Segments controls curve smoothness.
Leg Height	Leg Height adds vertical supports below the curved part.
Material Slot 0	Material Slot 0 controls the curved/top arch body; Material Slot 1 controls legs when legs exist.
Editable faces include front, back, top, and inner floor	Editable faces include front, back, top, and inner floor.

Use it when: use it for door arches, tunnels, sewer mouths, bridges, vaulted openings, and curved cover.

Stairs - Linear Open

Traversal and props

LinearOpen undersideSeparate treadsOptional balustrade

Linear Open stairs keep the underside open so the run reads as separate treads.

Parameter details

Parameter / area	Current behavior
Stair Shape	Stair Shape is Linear.
Linear Type	Linear Type is Open.
Step Count, Step Width, Step Depth, and Step Height define the straight run	Step Count, Step Width, Step Depth, and Step Height define the straight run.
Each tread	Each tread is selectable in face editing, so dragging that step top adjusts stair height from the selected surface.
Side Bar and Balustrade	Side Bar and Balustrade controls can add rails, balusters, and optional handrails.
Bottom-front and top-back snap points support stacked stair placement	Bottom-front and top-back snap points support stacked stair placement.

Use it when: use it when you need readable traversal metrics without a filled underside.

Stairs - Linear Closed

Traversal and props

LinearClosed undersideSolid supportOptional balustrade

Linear Closed stairs fill the underside with a sloped support surface.

Parameter details

Parameter / area	Current behavior
Stair Shape	Stair Shape is Linear.
Linear Type	Linear Type is Closed.
The underside becomes a continuous sloped wedge below the tread run	The underside becomes a continuous sloped wedge below the tread run.
Step Count, Step Width, Step Depth, and Step Height still control the visible steps	Step Count, Step Width, Step Depth, and Step Height still control the visible steps.
Each tread	Each tread is selectable in face editing, so dragging that step top adjusts stair height from the selected surface.
Side Bar and Balustrade	Side Bar and Balustrade controls remain available.

Use it when: use it for blockout stairs that need a solid underside or ramp-like mass.

Stairs - Linear Box

Traversal and props

LinearBox undersideBlocked volumeTraversal mass

Linear Box stairs generate a boxed mass under the stair flight.

Parameter details

Parameter / area	Current behavior
Stair Shape	Stair Shape is Linear.
Linear Type	Linear Type is Box.
The generated underside fills as a rectangular stair volume	The generated underside fills as a rectangular stair volume.
Step Count, Step Width, Step Depth, and Step Height define the top tread pattern	Step Count, Step Width, Step Depth, and Step Height define the top tread pattern.
Each tread	Each tread is selectable in face editing, so dragging that step top adjusts stair height from the selected surface.
Box underside	Box underside is useful when the volume should block sightlines or collision underneath.

Use it when: use it for chunky blockout stair volumes, cover, and closed architectural masses.

Stairs - Spiral

Traversal and props

SpiralInner/outer radiusStep angleCenter column

Spiral stairs wrap steps around a center using inner/outer radius and angular controls.

Parameter details

Parameter / area	Current behavior
Stair Shape	Stair Shape is Spiral.
Spiral Inner Radius and Spiral Outer Radius define the tread ring	Spiral Inner Radius and Spiral Outer Radius define the tread ring.
Step Angle	Step Angle controls angular spacing per step.
Counter-Clockwise flips winding direction	Counter-Clockwise flips winding direction.
Each step top	Each step top is selectable in face editing, so dragging that surface adjusts stair height.
Radial Segments and Column Radius shape the center support and curvature	Radial Segments and Column Radius shape the center support and curvature.

Use it when: use it for tower traversal, compact vertical routes, and circular room metrics.

Stairs - Circular Platforms

Traversal and props

Circular platformsStacked tiersRadius reductionPlatform sides

Circular Platform stairs build stacked round tiers instead of a linear flight.

Parameter details

Parameter / area	Current behavior
Stair Shape	Stair Shape is Circular Platforms.
Circular Platform Radius	Circular Platform Radius controls the largest platform.
Radius Reduction Per Step tapers each higher tier inward	Radius Reduction Per Step tapers each higher tier inward.
Platform Sides	Platform Sides controls the roundness or faceted style.
Each platform top	Each platform top is selectable in face editing, so dragging that surface adjusts stair height.
Step Count and Step Height define vertical tier spacing	Step Count and Step Height define vertical tier spacing.

Use it when: use it for arena tiers, podiums, circular staging, and radial traversal tests.

L-Shape

Structural blockout

Wing AWing BShared widthSingle actor footprint

The L-Shape creates two perpendicular wings as one procedural actor.

Parameter details

Parameter / area	Current behavior
Wing A Length	Wing A Length controls the local +X wing.
Wing B Length	Wing B Length controls the local +Y wing.
Wall Width	Wall Width is the shared corridor/arm width.
L Height	L Height controls the vertical extrusion of both wings.

Use it when: use it for corner rooms, L corridors, wrapped cover blocks, and footprints that should resize as one piece.

Polygon

Radial and curved forms

Filled capBorder ringTriangle to high-sidedExtruded prism

The Polygon builds an N-sided filled or hollow planar/prism shape.

Parameter details

Parameter / area	Current behavior
Radius	Radius controls the circumradius.
Thickness extrudes the polygon; zero leaves it flat	Thickness extrudes the polygon; zero leaves it flat.
Sides	Sides changes the footprint from triangle to high-sided round-like forms.
Cap Filled	Cap Filled toggles between a filled polygon and border-only ring.
Border Thickness	Border Thickness controls the ring width when Cap Filled is off.

Use it when: use it for custom pads, trims, hex platforms, floor symbols, border rings, and stylized footprint blocks.

Door

Traversal and props

Hinged panelCustom pivotSwing directionRuntime toggle

The Door is a runtime-capable hinged panel, not just a static blockout mesh.

Parameter details

Parameter / area	Current behavior
Door Width, Height, and Thickness scale the panel	Door Width, Height, and Thickness scale the panel.
The shared Setup Pivot X and Pivot Y values place the hinge anywhere across the door footprint	The shared Setup Pivot X and Pivot Y values place the hinge anywhere across the door footprint.
Open Angle, Swing Direction, Play Rate, and Start Open control animation behavior	Open Angle, Swing Direction, Play Rate, and Start Open control animation behavior.
Door Mesh	Door Mesh accepts a custom static mesh/material setup.
Set Door Open and Toggle Door	Set Door Open and Toggle Door are callable at runtime.

Use it when: use it for interactive door planning, hinge clearance checks, and Blueprint-ready placeholder doors.

Ladder

Traversal and props

RailsRungsClimb zoneStack snapping

The Ladder is separate from Stairs and builds rails plus rungs with climb support hooks.

Parameter details

Parameter / area	Current behavior
Ladder Height and Ladder Width define the climbable frame	Ladder Height and Ladder Width define the climbable frame.
Rail Thickness and Rung Thickness control the geometry thickness	Rail Thickness and Rung Thickness control the geometry thickness.
Rung Count and End Rung Inset distribute rungs between the rail ends	Rung Count and End Rung Inset distribute rungs between the rail ends.
Top and bottom snap points make stacked ladder layouts easy	Top and bottom snap points make stacked ladder layouts easy.
The runtime tick can track a climbing character in the ladder zone	The runtime tick can track a climbing character in the ladder zone.

Use it when: use it for vertical traversal prototypes where a stair shape would be the wrong gameplay read.

Barrel

Traversal and props

Bulged bodyStave groovesMetal hoopsPer-hoop editsBody/hoop tint

The Barrel actor generates a bulged prop-like form with separate body, cap, and hoop sections.

Parameter details

Parameter / area	Current behavior
End Radius, Bulge Depth, Height, Sides, and Height Segments define the barrel body	End Radius, Bulge Depth, Height, Sides, and Height Segments define the barrel body.
Stave Count and Stave Groove Depth create vertical wooden grooves	Stave Count and Stave Groove Depth create vertical wooden grooves.
Hoop Count, Hoop Width, Hoop Depth, and Hoop Inset create metal bands	Hoop Count, Hoop Width, Hoop Depth, and Hoop Inset create metal bands.
When a barrel	When a barrel is selected in ULDK editor mode, each hoop can be selected and dragged independently to override the global hoop width/depth placement.
Material Slot 2 - Hoops	Material Slot 2 - Hoops controls the hoop section.
Wood Tint and Hoop Tint update default dynamic materials without rebuilding the mesh during color-wheel edits	Wood Tint and Hoop Tint update default dynamic materials without rebuilding the mesh during color-wheel edits.

Use it when: use it for quick prop blocking, destructible-cover placeholders, storage rooms, docks, and medieval/fantasy set dressing.