Se-sal

This engine recreates Se-sal (細箭), a changho whose frame is filled with closely spaced vertical slats, crossed by only three or four horizontal slats at the top, middle and bottom. The name comes from 細 ("fine"), pointing to the slats' slenderness — the fine, straight grain created by those dense vertical slats is the face of this changho. Also called ttisal-chang, it was the most widely used lattice changho form of the Joseon period. The studio is laid out in three panels — the design sidebar on the left, the canvas, and the background and export sidebar on the right — and every parameter change appears on the canvas immediately.

Screen Layout

① Left Sidebar — Design Parameters

Door settings

Item	Options	Description
Door type	Hinged / Sliding	Hinged: hinge construction. Sliding: sliding rail construction
Number of panels	1 – 4	The total width is divided evenly as you add panels

Door dimensions

Item	Range	Unit
Frame width	400 – 3,000	mm
Frame height	400 – 3,000	mm

Lattice settings

Item	Description
Horizontal cells	Number of horizontal divisions (slat count = cells − 1)
Left/right stile thickness	Thickness of the left and right outer frame members (mm)
Top/bottom rail thickness	Thickness of the top and bottom outer frame members (mm)
Slat thickness	Cross-section thickness of the lattice slats (mm)
Horizontal slat layout (top/middle/bottom)	Set the horizontal cell count of each of the three zones independently, e.g. 3/5/3
Vertical ratio	Height ratio between the top, middle and bottom zones
Use transom panel	Adds a transom panel zone at the top when checked. Its height is set separately
Show dimensions	Displays each member's measured dimensions on the canvas when checked
Show door frame	Displays the door frame (wall opening) outline on the canvas when checked

Production specification

Measured dimensions calculated automatically from the parameters you enter.

Item	Description
Frame width / height	Wall opening dimensions (exactly as entered)
Outer width / height	Full door panel size (including stiles and rails), calculated with frame thickness and clearance removed
Inner width / height	Effective inner dimensions, excluding stiles and rails
Horizontal / vertical cells	Lattice division counts
Eye size	Inner size of a single lattice cell
Slat list	Lengths × quantities for vertical slats, horizontal slats and frame members

② Canvas — Preview & Controls

Drawing management bar (top)

Button	Function
Enter drawing name…	Type a name for the drawing. It is stored in the cloud under this name when saved.
New drawing	Resets the current drawing and starts a new one
Drawings	Opens the list of saved drawings so you can switch to another one
Version ▾	Save history for the current drawing. Click to restore an earlier version from the dropdown

Canvas toolbar (bottom)

The bottom of the canvas gathers the view controls — zoom and pan — along with the slat delete/add editing modes, motif placement and shape drawing buttons. These are shared across all six engines; see the Canvas Toolbar page for the full list and how to use them.

③ Right Sidebar — Finish · Background · Saving

Save / order

Button	Function
💾 Save	Saves the current drawing to the cloud. Saving under the same name adds a version.
Order	Goes to the production inquiry page based on the drawing you designed

Finish settings

Item	Options
Wood	Red pine / Pine / Oak
Inner surface	Hanji paper / Glass / Acrylic
Frame color	Choose from the color palette
Slat color	Choose from the color palette
Panel color	Set directly with the HEX color picker. Use Fill to color specific cells

Background photo & AI rendering

Upload a photo of the site, composite it with your drawing, and render it with AI. See the Using AI Rendering page for details.

Export

Button	Output
PNG	Downloads the current canvas view as a transparent-background PNG
PDF	Print-optimized PDF, including dimension annotations