Entry 109

Movers and the elevator as the original thinks them

2026-10-157mplay

Filescrates/rugrats/src/world/game/movers.rs crates/rugrats/src/world/game/mod.rs crates/rugrats/src/levels/outer_space.rs crates/rugrats/tests/play.rs

The port's moving platforms were a simplification. They now follow 0x80048804 (setup) and 0x8004ee00 (the think) as written (docs/levels/level-05.md, "The elevator").

Setup.

• +0xbe starts 0: every axis "back" and so done. The enter callback 0x8004f228 arms the mover (schedules its think) and turns each done axis, which is what sends it out.
• Template flag 0x10000000 gives object 0x20000: back and forth.
• 0x40000000 gives +0xbe 64 and no enter callback: armed only by landing on it (0x800627a0 sees +0xf8).
• Template 855 gives +0xbe 256: it calls.
• +0xc0 is the base y.

The think, each frame while armed.

• Unridden, it holds while 0x8006baa8 finds the player in its boxes, and asks 0x8004ed00 whether to turn. A calling mover turns toward the end nearer the player's height. Level 5's 855 just answers 1.
• Per axis, step toward the range or back to 0 until done. There is no clamp, so 205 steps of 60 end 12 past the elevator's 12288.
• Level 5's elevator, unridden with that 1, does not move while below half its range.
• After the move:
  • back-and-forth movers turn their done axes, unless ride-only and neither ridden nor with the player over it (0x8004ec34);
  • others stop their think when every axis is done and 0x8004ed00 answers 0.

The port arms on the trigger's enter edge (not every frame within it), on landing for ride-only movers, and has Mover::call, arm and done. Game::mover_tests gives 0x8004ec34 (the player over the model's first box in x and z, in the mover's frame) and the blocking test.

Level 5's init sets template 855's step to 60 (0x80046ed8 writes the template), so the port now matches by template, not by id.

The test level_5_the_elevator_goes_down puts Tommy on the elevator. It goes down 12300 in 205 frames from the landing, as the oracle's 410 VSyncs from -4578 to about 7710, carrying him.