Sable: Sure Footing

A tiny NeoForge 1.21.1 mod for Sable that keeps you moving with a contraption while you jump, so you land where you took off — including on rotating platforms.

What	Side	How
You (jumping, walking)	Client	Carry through jump arcs + frame-rotate velocity
Non-player entities (item drops, XP orbs, mobs, boats…)	Server	Same carry state machine, plus tracking is seeded when an entity spawns over a contraption (dropped items pop upward and would otherwise never catch a fast deck). Projectiles are excluded — Sable already gives them launch velocity, and frame-locking would bend their flight.
Particles (smoke, flames, block breaking…)	Client	Sable frame-locks particles but releases them after 0.5 blocks of drift with a one-shot linear velocity — rising smoke gets flung tangentially. We re-anchor tracked particles every tick while they stay near the contraption.

On a server without the mod, the player and particle fixes still work for clients that have it; the entity fix needs the mod on the server.

Config (config/surefooting-client.toml)

Option	Default	Meaning
enabled	true	Toggle the fix
rotate_jump_velocity	true	Rotate your airborne velocity with the sub-level's frame, so a jump aimed across a spinning platform lands where you aimed
rotate_ground_velocity	true	Rotate your walking momentum with the frame too, cancelling most of the sideways (Coriolis-like) pull when moving on a fast spinner
jump_rotation_strength	1.16	Multiplier on the airborne rotation; 1.0 aligns to the frame but trails it slightly while your velocity is applied, values above add lead so cross-jumps stay accurate at any constant spin rate (default tuned in-game)
ground_rotation_strength	2.25	Multiplier on the grounded rotation; higher values also compensate per-step lag on fast spinners (tuned in-game — 2.2–2.3 walks straight), lower toward 1.0 if you curl into the spin
carry_timeout_ticks	60	Max airborne ticks to stay in the contraption's frame
exit_distance_blocks	4.0	Stop carrying once this far outside the sub-level's bounds
anchor_particles	true	Keep particles anchored to the contraption they spawned on while they stay near it
debug_logging	false	Log carry transitions and per-jump landing offsets