PapaiArt - Level Editor maps come to Level Modeller

Today's update is a big one: PapaiArt Tools - Level Modeller and Level Editor now properly talk to each other, and the modeller got a round of engine and workflow upgrades.

Import your Level Editor maps — as real meshes

• New File → Import Level Editor Map… brings any Level Editor map into the modeller as a mesh object: floors, ceilings, walls, portal steps between connected rooms, nested rooms and slopes all come across exactly as the Level Editor builds them.
• The map's texture project loads along with it, and the imported mesh keeps every floor/ceiling/wall texture assignment. Everything arrives ready to render.
• The two tools now share the same texture project file format and name, so one .project file can serve both. Older library files still open fine.

Multi-material meshes

• The engine now supports multiple materials on a single object — no more one-texture-per-mesh limit. Imported OBJ files with material groups get this automatically too.

Booleans on big meshes

• You can now carve into an imported map (or any large mesh) with positive/negative objects. The CSG core was rewritten to handle thousands of polygons without breaking a sweat — a whole class of freezes and crashes on large inputs is gone.

Rendering & selection

• The viewport is now anti-aliased (4x MSAA) — clean edges on walls, wireframes and gizmos.
• Backfaces are no longer drawn: look into a room from outside just like you'd expect in a level editor.
• Clicking now selects what you actually see — hidden back walls don't swallow your clicks anymore.