Web-Mappy: build TA maps in your browser

The map section libraries now come with their own workbench: the new Map Editor (Web-Mappy) runs the classic section-based editing workflow entirely in the browser — pick a tileset world, snap ready-made terrain pieces (hills, coasts, rivers, cliffs) onto a flat base, and export a playable .tnt + .ota pair.

• 25,447 terrain sections in 182 worlds are available in the editor, served as per-world bundles with their original tile graphics and heights (downloaded when you pick a world, then cached).
• Seam-fit hints: every palette piece shows how its height contours match the pieces already placed — fits means the seam is within 3 height units, no fit means a visible cliff.
• The flat base renders with the world’s own ground tile and auto-snaps to the tileset’s standard flat height; a live minimap preview shows the map as the game will see it.
• Export writes the terrain file and a mission header with four start positions on dry ground — drop both into your TA directory and play.
• Layouts save as a small .webmappy.json so you can finish a map later.

Not yet in the editor: feature placement (trees, rocks, metal) and random scatter — the terrain workbench comes first. Sections © Cavedog Entertainment and the community tileset authors, see the Map Section Packs page for credits.