PolyBash

PolyBash turns Unity splines into level geometry. Draw a spline, and PolyBash builds a walkable stair path or a complete building along it. Move a knot and the result rebuilds right away. The output is ordinary GameObjects with meshes, materials and colliders, so it works with standard Unity tools.

Two spline generators

Spline Stair Path Generator: sections that rise become stairs, and level sections become flat paths. Step heights and depths stay inside the limits you set. Add side walls, tunnels with arch frames, edge trims, handrails, balusters, and smooth ramp colliders for character controllers.

Spline Building Generator: builds outer and inner walls, floors, ceilings and gable roofs over one or more levels. Define door, window, and floor openings, and then generate frames, glass panes, and door leaves to fill them.

Texture generation from 3D blocks: A Texture definition lays out bricks, stones, boards or roof tiles and captures them into tileable albedo, lit albedo, normal and ambient occlusion maps, then creates a material for you. Surface variants recolor the blocks through two gradients, so one set of blocks gives stone, brick, wood siding and roof tile in many color schemes. Drag a slider and the generator updates with the new colors.

Customizable and genre-flexible: Every width, height, level, opening and material is editable, and optional stages turn on and off with a checkbox. Bake a finished result into a standalone prefab with Save to Prefab. PolyBash suits fantasy villages, medieval towns, stylized and low-poly worlds, platformers, dungeons, bridges, and quick greyboxing for any genre.

The included BridgeHouse sample scene shows two houses on a bridge with stairs, ready to explore in URP, HDRP or the Built-In Render Pipeline.