---
id: t35
title: Diagonal screw tubes
status: Todo
created: 2026-10-25
updated: 2026-10-25T02:35:19Z
---



## Context

- Screw tubes only run straight: up, down, left or right. Add diagonal tubes, and let them be placed diagonally (dragging a line at 45° lays a diagonal run), so grains and bars can be carried up or down a slope without stair-stepping straight pieces.

## Subtasks

- [ ] Decide how a diagonal tube looks and fits the 4×4 block grid (a block per diagonal step, or a dedicated diagonal piece)
- [ ] Move grains and bars along diagonal tubes, including joining onto and off straight tubes and belts
- [ ] Placing: dragging at 45° lays a diagonal run; R picks the diagonal directions when placing a single piece
- [ ] Copy, cut, paste, undo and blueprints handle diagonal tubes
- [ ] Tests for carrying sand and bars up and down a diagonal run, and for the joins