Entry 125

Thrown things meet objects

2026-10-166mplay

Filescrates/rugrats/src/world/game/things.rsmod.rscrates/rugrats/src/actors/player.rscrates/rugrats/src/levels/box_toss.rscrates/rugrats/tests/play.rs

0x80061f88 builds the descriptor of a thing thrown or dropped. Its flags:

• 0x9070700 for most things: gravity 0x700; the world, objects (0x20000) and their touches (0x40000); ends on the floor. Level 9 also sets 0x40000.
• 0x190f0700 for an object with flag 0x800000: all collisions, damage, and the objects' own test (0x10000000).
• 0x9010700 for levels 20 and 21's held box or bottle (0x800c42a4): the world only.

The port's thrown things met only the COL world and things at rest. They passed through furniture and could not land on a table.

Now the game keeps this frame's object boxes in Game::solid: the static objects, breakables, movers, spinners, walkers and doors, without things and characters. A thrown thing:

• lands on an object's top as it does on a resting thing's (stacking, 0x8006c7a0);
• bounces off an object's side. That is when the step moves it into the box seen from above, at a height the box spans, and it was outside before. The bounce uses rebound off the side it came through (Box3::side_normal) with the template's bounce, as off a wall.

Thing::world_only marks levels 20 and 21's box or bottle, which skips both. Without it, level 20's lob landed on the furniture short of the baby and the level could not be won. That matches the original's world only flags.

Test: a_thrown_thing_lands_on_an_object drops a hub thing 1500 over a wide object whose top is more than 300 above the floor. It rests on the top. With world_only set, the same drop ends on the floor (727 + 297 against a top of -595), so the test tells the two apart.

Resolved from earlier entries:

• 61.3: the pause's Quit confirm already has the four items of 0x80036368. They are "Yes?" and "Save Game?" on the left, "No?" and "Load Game?" on the right, under "Quit Level?" or "Quit Game?".