Border draws the lines that decide where colour stops. There are two ways in. Click a crease in the geometry and the entire connected loop along that edge snaps in as a boundary — one click, no tracing. Or drag across a surface and a freehand line follows your stroke, for a split that isn't on any edge at all.
Each enclosed shape you draw becomes its own piece, so Magic Fill can flood one side without touching the other. The border is the wall; the colour stops at it.
When you pick Border, Layerpaint nudges a low crease threshold up to 40° so the seam overlay shows the strong edges instead of a sea of dots. The faint lines you see are exactly the creases a click would lock in.
- Magic Fill grabbed too much. One tap took the whole chest when you wanted two halves. Draw a line down the middle, then fill each side.
- The split isn't on an edge. A flag stripe, a banner, a paint-job division that ignores the geometry — drag the line you want.
- You need to seal off an area. Ring a patch and close the loop so it holds its own colour, separate from everything around it.
- Auto-Partition missed a seam you wanted as a wall, and you'd rather mark it by hand than re-tune the slider.
- Pick Border from the rail — it sits between Mark and Pick. The seam overlay sharpens to the strong creases.
- Click a crease. The whole connected loop locks in as a boundary in one click.
- Drag where there's no crease. A line follows your stroke. Lift the mouse and Border auto-closes small gaps along the path, so a rough drag comes out as a clean line — no perfect aim required.
- Sealing a shape? Ring the area, then hit Close loop in the Setup panel to join the stroke's two ends. The encircling line now holds colour inside it.
- Erase: hold
Shiftand drag. The round cursor is a broad eraser that wipes any border inside it, at any depth — front and back faces both. - Fill it. Switch to Magic Fill, pick a colour, click each side. Each one stops at the border.
- Start over fast. Setup panel → Clear drawn boundaries removes every border you've drawn in one move. Auto-partition seams stay; paint stays.
Ctrl+Zundoes it if you change your mind. - Not sure what a control does? The (i) toggle at the top of the right panel turns on per-control help text.
- Zoom in for precise lines. On a zoomed-out model a small drag spans a lot of surface — get close before drawing a fine split.
Every time you release a draw-stroke, Border seals small breaks along it automatically. You don't have to trace a flawless path or reach for a button — drag roughly across the gap and lift. For a full ring, add Close loop to join the two ends so the shape holds colour.