---
id: t36
title: Diagonal wall blocks with a smooth sloped face
status: Todo
created: 2026-10-25
updated: 2026-10-25T02:45:20Z
---



## Context

- Walls can only be placed on the square block grid, so a sloped wall is a staircase of blocks. Grains catch on every step instead of sliding down, which makes funnels and hoppers clog. Add diagonal wall placement, and wall pieces whose face is a flat 45° slope, so loose material slides smoothly down a funnel wall.

## Subtasks

- [ ] Add sloped wall pieces: half-block triangles in the four orientations, so a run of them makes a flat 45° face
- [ ] Dragging a wall line at 45° lays a diagonal run of sloped pieces; R picks the orientation for a single piece
- [ ] Grains, liquids and bars slide down the flat face without catching (check powder sliding and the STICK rule against a straight 45° line)
- [ ] Works with every wall material; refunds, copy, cut, paste, undo and blueprints handle the new pieces
- [ ] Tests: sand poured into a V funnel of sloped walls all comes out the bottom; the same funnel built from square steps for comparison