Custom Piece
A Custom Piece is the exception in a wall: the door, the arch, the gap, the one special corner. Add it from the Spline Architect menu while a Wall is selected, drag it along the path to where it belongs, and the wall regenerates around it.
In the clip: a doorway inserted among the ground-floor shutters - it cuts its slot - then shop signs overlaid on top of the generated wall, and a vertical piece assigned to a range of Floors so it runs up the facade.
Actor controls
| Control | What it does |
|---|---|
| Custom Piece Preset | Full placement and asset configuration described below. |
| Location Locked | Read-only state showing whether manual movement is constrained. |
| Locked Location | World position restored when the actor is locked and moved. |
| Lock Position / Unlock Position | Captures the current location or allows movement again. |
Locking pins a piece against the generator sliding it along the spline. It does not pin it in the world: the piece travels with its wall when the wall moves, and stays put when the wall's pivot is reset or centred.
Custom pieces can also be placed from a PCG graph. Mark scattered points with SA Set Custom Piece and feed them into SA Spawn Wall's or SA Spawn Curve's Custom Pieces pin.
Custom Piece Preset
| Control | What it does |
|---|---|
| Custom Piece Type | Segment replaces/overlaps a straight span; Corner replaces a corner. |
| Corner Type | Straight, Bend, Chamfer, or Pipe behavior for a Corner piece. |
| Custom Piece Mesh | Mesh to generate; leave empty to create a gap of Custom Piece Length. |
| Input Key on Spline | Position along the spline in point-index space. |
| Floors | Segment floor selection such as 1,2,6-8; empty means all floors. |
| Num Meshes | Repetition count inside the custom span. |
| Fill Segment | Repeats across the complete owning segment and scales oversized pieces to cover it. |
| Override Length / Custom Piece Length | Uses a logical span instead of mesh X bounds. |
| Overlap By | Extends into adjacent wall output to hide seams. |
| Add to Scale | Additive per-axis scale for Segment pieces. |
| Reverse Orientation | Flips a Segment piece. |
| Ignore Post Generation | Suppresses posts at locations covered by the piece. |
| Keep World Scale / World Scale | Keeps authored proportions and exposes an explicit scale. |
| Add Transform | Local location, rotation, and scale offset. |
| Insert Type | Insert cuts a slot; Overlap places the piece over normal wall generation. |
| Child Actor Class / Scale / Offset | Spawns a Blueprint/Actor child and adjusts its scale and position. |
Use Insert for doors and gaps, Overlap for signs and facade attachments. If a piece should appear through PCG rather than belong to one Wall, use the PCG prop recipes.