Entry 164

Slides, one bump, air control and the analog stick

2026-10-162h 3mplay

Filescrates/rugrats/src/actors/player.rscrates/rugrats/src/input.rscrates/rugrats/src/world/game/mod.rscrates/rugrats/tests/play.rs

Running into things now slides, bumps and stands as the original does, the stick pushes a jump along in the air, and the port reads a DualShock's analog stick.

Slides and the bump (0x8005d11c, 0x8005e1f4, 0x80065120). The stand, walk and run handlers share one rule for a step the probes find held up: +0x130 is the angle between the step turned back and the face's normal (0x800657d0 through 0x800761c8). Under 384 (220 as Spike, +0x15c 6) the thing is met head-on: the climb test, else the run's bump (state 9); from 384 to a right angle the step goes along the face instead, at its whole length (0x80065120 turns +0x178 by 0x800763d0's tangent, rcos 1024 being 0), if the probes then find that way open, or meet a face there at 512 or more (held, no bump); else the head-on path. A wall's hit has no thing (+0xf4 0): the bump without damage. The oracle, level 18, Tommy put at (28664, 12748) facing 1433, R1, Up held: along x 30866 from z 11166 (door 213's box at a slant), along x 31335 from z 6039 (a cell's side), then head-on into the corner's other wall at (31335, 5529): state 9 for 13 frames, then state 0 with Up still held, no bump again. The port matched none of it (it bumped on the door every 14 frames, for ever); it now follows within 8 throughout (a_run_slides_along_walls_and_bumps_once_as_ the_original). Standing, a held-up step leaves the body standing, and the stand handler's climb test runs from a standstill (a box pushed at from beside it is climbed).

Air control (0x80061330). The stick in the air, turned by the camera into the body's own frame with its sideways part halved, pushes against a drag of 32/4096 of the speed, both a unit of time, the step v dt + a dt^2 / 2. The port had a drag of 32/4096 a frame and no push. The oracle, level 6's shelf, put at (40334, -4341, -34944) facing 1024, R1, Up held, Cross: steps across 111, 122, 132, 142, 152, 160, 168, ... 226 a frame, where the port's fell 106 to 90; fitted, the push at full is 12.55 a unit with the drag as coded (rms 1.1 a frame). The port is now within 4 a step (the_stick_pushes_a_jump_on_as_the_original). Cross at the shelf's edge jumps from its height (the oracle); the port's crouch had dropped the body 3072 to the floor under it.

The analog stick. Pad::stick carries the left stick (DualShock in analog mode), each axis taken over the D-pad's where larger, as 0x8005be24 does. The walking tests steer with it: an exact heading, a light push to turn in place without a step.

The walking campaign (every level won by play) needed its own fixes for the slower, truer movement: straight runs through pickups, three probes in the plan with the middle one alone as a fallback, a frame-counted stall, a repeated fall off the way banned, the jump shape with the push. All 16 levels walk with no fallback; level 17's nickels take 3818 frames of the clock.