Entry 56

Doors: hinged and sliding

2026-10-1526mplay

Filescrates/rugrats/src/game.rs crates/rugrats/src/level12.rs crates/rugrats/examples/play_script.rs

Class 3 and class 4 doors are now ported, from docs/engine/doors.md (traced and checked in the oracle). Before, they were fixed scenery boxes, so the hub's yard (Spike, the toys, a bar) could not be reached.

• Game::doors:
  • A Door is created for every class 3/4 placement with a model, except 843 (level 5's own doors) and 770 (golf's automatic door).
  • Doors are taken out of the scenery and the fixed boxes; their boxes and triangles are rebuilt each frame from Door::pose.
  • A hinged door turns: the placed matrix times a turn by +0xa8 about the origin.
  • A sliding door moves: its position is the start minus the placed matrix times the offset.
• Use:
  • The door is the one Tommy touches: its box covers him within RADIUS + 150, with height overlap. This replaces the original's touched-object pointer.
  • A use is refused while the door moves.
  • Hinged doors follow the facing rule: cos(h_p - h_d). One-way doors open only when Tommy faces against them; either-way doors (218, 1194) swing away from his facing. Closing needs him to face from the side the door swung to.
• Thinks:
  • Hinged: step trunc(speed x 136 / 4096). It stops on passing the target and snaps to it; closing to 0 stops on a sign change.
  • Sliding: 2 x step, stopping on the sum test with no snap.
  • The playpen gate's endless 1249/1250 comes out the same, as in the oracle: it stays open and refuses further uses.
• Blocking: if the next pose's box would cover Tommy or an NPC, the door does not move that frame. Level 16 shows message 24.
• Sounds: 14 open and 15 close (170 in level 16); 54 at the end of a hinged close (not 1216/672); 16/17 for sliding doors.
• Level 12: the refrigerator doors' use is turned off, so the cine stays the use.
• Checked:
  • Back door 337: Tommy is stopped at z 23020 while it is shut (oracle 23134). Triangle opens it, and he walks on into the yard (z 32030).
  • The gate opens only when faced against, then keeps moving (the quirk).
  • Yard door 218 opens in about 53 frames facing it. Facing away, it is blocked by Tommy.
  • No panics in any level. Doors found: DB5 2, DB10 4, DB12 8, DB13 7, DB15 8, DB16 4, hub 6.