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 weave 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°

Main Parameters

Item	Description
Door type / panels	Hinged or sliding, 1–4 panels
Frame width / height	Wall opening dimensions (400–3,000mm). 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 thickness set the triangle size, and the vertical count is derived automatically.
Vertical pattern orientation	On by default. Rotates the entire triangular grid 90°. The directional part names in the parts list change depending on whether this is on or off.
Auto-fit height	When checked, the frame height is adjusted so the last row meets the bottom rail exactly
Stile / rail thickness	Outer frame thickness (mm)
Slat thickness	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

There are no separate settings for vertical cell count or vertical ratio. To change the triangle size, adjust the horizontal cell count or the slat thickness.

Production Specification

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

Parts List

Ordered as frame members → horizontal members (whose name changes with the vertical pattern orientation setting) → diagonal slats (the 60° and 120° directions) → transom panel (if used) → door frame.

Finish & Color

Wood, finish, hardware and the frame and slat colors are the same as Se-sal. Panel fill is currently disabled.

Omitting one direction of slats from Semo-sotgeul-sal produces the Yukmo-sotgeul-sal pattern. The two engines share the same grid math and differ only in the direction of the lines drawn. Compare them on the Yukmo-sotgeul-sal page.

Example Uses

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