Forced movement is wired to the client and has no production caller #62

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opened 2026-07-30 21:02:58 +00:00 by sickday · 0 comments

sickday commented

2026-07-30 21:02:58 +00:00

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Forced movement is complete on the wire and has no production caller.

The chain is World.Player.force_move/5 -> pending_world.slide ->
World.Player.Advance.apply_slide/2 -> the 0x400 mask, and it is driven end
to end against a live tick by tier2_world_test.exs. What has no caller is
force_move/5 itself.

Two things it is worth knowing about it before writing one:

the deltas run backwards from the destination, not forwards from the
start, and writing them the other way round decodes perfectly and slides the
player the wrong way;
it needs a teleport applied with it — a slide whose teleport was refused is
logged and dropped rather than half-applied.

Agility shortcuts are the usual caller. Combat has a couple too (knockback,
some boss mechanics).

Filed as a seam rather than a defect: nothing is wrong, there is simply nothing
in the world that forces a movement yet.

Forced movement is complete on the wire and has no production caller. The chain is `World.Player.force_move/5` -> `pending_world.slide` -> `World.Player.Advance.apply_slide/2` -> the `0x400` mask, and it is driven end to end against a live tick by `tier2_world_test.exs`. What has no caller is `force_move/5` itself. Two things it is worth knowing about it before writing one: * the deltas run **backwards from the destination**, not forwards from the start, and writing them the other way round decodes perfectly and slides the player the wrong way; * it needs a teleport applied with it — a slide whose teleport was refused is logged and dropped rather than half-applied. Agility shortcuts are the usual caller. Combat has a couple too (knockback, some boss mechanics). Filed as a seam rather than a defect: nothing is wrong, there is simply nothing in the world that forces a movement yet.

sickday referenced this issue

2026-07-31 16:13:54 +00:00

Phase 2: the remaining fifteen skills #78

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Revenant/Server#62

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