Random fill¶

Brush > Random Fill… covers a grid of cells with pieces from the prefab library, picking each cell's piece by weight. Build a small kit of pieces, like an office room, a hallway, a pillar grid and an open floor, and the fill lays out a whole floor plan from them. Every seed gives a different plan, and the same seed always gives the same one.

1. Build your pieces

   Build each piece one cell wide (128 units by default), centered on the origin. Keep walls off the cell's border, so pieces next to each other always connect.

   Then add it to the library: select it, open Add the selection at the top of the Prefabs tab, tick Keep position, give it a name and click Add (see Your own pieces).

   

2. Open the dialog

   Go to Brush > Random Fill….

   

3. Add the pieces

   Pick each piece from Add piece… and give it a weight: a piece with weight 6 fills about twice as many cells as one with weight 3. turn lets a piece turn by a random multiple of 90 degrees.

   

4. (Optionally) Leave some cells open

   empty weight works like a piece that places nothing.

5. Place the grid

   Select the floor and click Fit to selection, or set the Cell size, the number of Cells and the Corner yourself.

6. (Optionally) Cluster the pieces

   Clustering gathers each piece into patches of about Patch size cells, so a wing of offices sits next to a hall of pillars instead of everything being evenly mixed.

7. Fill it

   The colored grid previews the layout, one color per piece. Click Fill, and Reroll replaces the last fill with the next seed.

   

The fill is one group of plain copies, so it bakes and builds like anything you place by hand, and you can edit any cell afterwards. Each copy's entity names get their own prefix, rf<seed>_<n>-, so a piece with wired entities, like a lamp that flickers on a timer, works on its own in every cell.