Semo-sotgeul-sal

This engine recreates Semo-sotgeul-sal, where a vertical slat and two diagonal slats meet at a single point from three directions. Sotgeul means "rising," named for the way the slats overlap and rise at each crossing point, giving the lattice a layered, three-dimensional feel. Because the crossing slats repeat as equilateral triangles across the whole surface, it creates a taut, tense impression — quite different from the round, generous feel of the hexagonal pattern. The vertical cell count is calculated automatically so that every cell forms an equilateral triangle, and cannot be set manually.

Slat Composition

Slat direction	Angle
Vertical slat	0° (vertical)
Right diagonal slat	60°
Left diagonal slat	120°

Door Tab — Main Parameters

Item	Description
Hinged · Sliding / panels	Hinged 1–2 panels, sliding 1–4, 6 or 8 panels
Frame width / height	Wall opening dimensions (width 100–10,000mm, height 400–5,000mm). The outer panel size is calculated with the frame thickness removed.
Horizontal cells	2–30, adjustable in even steps only (default 4). This and the slat width set the triangle size, and the vertical count is derived automatically.
Pattern vertical direction	On by default. Rotates the entire triangular grid 90°. The directional part names in the member list change depending on whether this is on or off.
Auto-fit frame height	When checked, the frame height is adjusted so the last row meets the bottom rail exactly
Left/right stile · top/bottom rail width	Outer frame width (mm)
Slat width	Width of each slat (mm). It also determines the equilateral triangle cell size.
Use transom panel	Adds a transom panel zone at the top when checked

Specs Tab — Production Specification

Item	Description
Frame / outer / inner width and height	Automatically calculated measured dimensions
Vertical ink lines	Spacing between triangle intersections
Half-lap width	Width of the half-lap joint where slats cross
Vertical stile groove width / Horizontal stile groove width	Width of the groove the slats cut into the frame

Member List

Ordered as frame members → horizontal members (whose name changes with the Pattern vertical direction setting) → diagonal slats (the 60° and 120° directions) → transom panel (if used) → door frame. The surface area, weight & volume table further down works the same way as Se-sal — see the Se-sal guide for details.

Finish Tab

Choosing the wood, hardware and colors per part to colour (frame, stile & rail, slat, face) works the same as Se-sal. Pick Face as the part and you can click cells in the drawing to fill just those cells (Paint face color).

Example Uses

• Ceiling lattice patterns in traditional pavilions
• Facade screens in contemporary architecture
• Interior ceiling light boxes