Entry 161

The ground move meets objects by its probes; level 2's ride is Spike's

2026-10-161h 20mplay

Filescrates/rugrats/src/actors/player.rscrates/rugrats/src/world/game/doors.rscrates/rugrats/src/levels/grandpas_teeth.rscrates/rugrats/tests/play.rs

Worklog 159's open item, the port stepping Tommy onto level 3's spinning toy, led to how the original moves the player against objects at all.

The ground move's probes (0x80063d3c). A hook trace on the oracle (Tommy running east along level 3's z 4290): 0x80065210 is not called in play (only at load); the move calls the segment test 0x80067284 four times a frame from 0x80063d3c, called by 0x80064a34 three times: probes from the body's middle, (0, 0, d), (-w, 0, d) and (w, 0, d) turned by the facing, d = the body box's depth (header +8/+0x10, the larger) + speed +0x184 x D_800c3f1c (10, peeked), w its half-width. Each object of the nearby list (template flag 8 aside), each model box: the probe at the box's own middle height (its unturned (lo y + hi y) / 2 + the object's y), kept within the body's (pos + body lo y .. hi y), tested against the turned box (0x8006a714 -> 0x80069c40); a COL wall nearer cancels the hit (0x80063c3c). The level 3 toy's middle is y 504 (its box lies along x, turned), above the band its box spans (692..968): the probes pass over it, and the oracle's Tommy runs past at every phase.

The port's player step now tests these probes against objects on the ground (Player::probes, probe_height, Box3::segment_hit); a hit sends the body back across, as before. The oracle, the shut hub back door from z 22000: run, stopped at 23020 (250 + 170 short of the panel); walking, 23120; both exact in the port (hub_back_door_opens_to_the_yard). An object is floor on the ground only with its top not above the body's origin (the floor test runs down from it), so the toy is not stood on (tommy_runs_past_level_3s_tipped_toy_as_the_original). In the air the old test stands. A door is touched for a use by these probes along the facing too (a run's reach: the back door opens from 23020).

Level 2's ride is Spike's. The probes met level 2's hurdle (template 1187, a bar 950..1283 over the yard floor) for Tommy on Spike, his body box -1230..700 high: on the oracle he is thrown back from it too, and the player character is 6 after cine 3 (0x800c5680, 1 before). 0x80060f1c gives character 6 a running jump of 1400 up, 50 a unit of speed along (level 11's 1700, 20): the oracle's ride, run then Cross, peaks with the feet 2020 over the floor, clearing the bar; its run is 200 a frame (Spike's gait). chase now sets character 6, gait (20, 10) and that jump; the court gives Tommy his back.

The walk: the plan's steps keep the middle probe clear of things (Ground::probes_clear), and a jump is tried where it is not within 1024; a leap ends on landing (Cross held on, the body jumped again: level 18's bunny hops to the map's edge), takes off within 85 of its point (a shelf's edge), and goes on over a thing that holds the run up; a walk gets 80 plans and clears its bans once when every way is banned; a last stride counts within 512 (a thing holds the body its probes' reach off); level 10's babies are gone up to within 850 (the tag's 900), level 11's bones from about the run-up (near) with the turn within 64.