Built-in AO: seamless state changes (no default-animation flash, sit / transition guards, instant re-send on region change) #668

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opened 2026-10-11 05:32:54 +00:00 by sky_line · 1 comment

sky_line commented

2026-10-11 05:32:54 +00:00

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Scope changed (2026-10-18): the server-side mode via llSetAnimationOverride is dropped.

Why it was dropped:

llSetAnimationOverride only takes animations stored inside the scripted object, never a UUID.
A worn object can only receive full-permission items, so almost all commercial AO sets couldn't use it.
The server-side mode would be strictly weaker than our viewer-side AO, which plays any animation by UUID with no permission barrier.

The goal stays the same: AO state changes with no flicker and no lag.

Problem

SLAOEngine reacts after the fact. It watches the signalled avatar state, then stops the default animation and starts the override. For one network round trip the stock animation can show: the stand to walk, landing and turning blips. On region change it un-confirms its channels and retries instead of restoring the current animation at once.

Work

Synchronous intercept: for our own avatar, decide the override where the default motion would start or stop (LLVOAvatar::startMotion / stopMotion). Request the replacement animation and skip the stock motion locally, so the default never plays at all.
Guards:
- keep the current override when the AO is enabled or reloaded mid-state, instead of letting the resulting stop kill it;
- ignore region-echoed stops caused by our own transitions, such as entering or leaving water;
- clean up stray override animations left from other states;
- use a base sit pose under sits, and step aside for foreign seat animations.
- transient states (landing, standing up, pre-jump) keep the stock motion with the override layered on top where that looks right.
Region change: re-send the current state's override immediately on arrival.
Keep the existing deferral rules: scripted AOs (PAUSE_SERVER_AO, PAUSE_SCRIPTED_AO), Pose Studio, user pause and the /ao commands.

Done when

Stand / walk / run / fly / jump / land / sit transitions show no default-animation frames, for you and for observers.
A region crossing or teleport keeps the current override with no gap.
Scripted AOs, poseballs and Pose Studio still take precedence as today.

**Scope changed (2026-10-18):** the server-side mode via `llSetAnimationOverride` is dropped. Why it was dropped: - `llSetAnimationOverride` only takes animations stored inside the scripted object, never a UUID. - A worn object can only receive full-permission items, so almost all commercial AO sets couldn't use it. - The server-side mode would be strictly weaker than our viewer-side AO, which plays any animation by UUID with no permission barrier. The goal stays the same: AO state changes with no flicker and no lag. ## Problem `SLAOEngine` reacts after the fact. It watches the signalled avatar state, then stops the default animation and starts the override. For one network round trip the stock animation can show: the stand to walk, landing and turning blips. On region change it un-confirms its channels and retries instead of restoring the current animation at once. ## Work 1. **Synchronous intercept:** for our own avatar, decide the override where the default motion would start or stop (`LLVOAvatar::startMotion` / `stopMotion`). Request the replacement animation and skip the stock motion locally, so the default never plays at all. 2. **Guards:** - keep the current override when the AO is enabled or reloaded mid-state, instead of letting the resulting stop kill it; - ignore region-echoed stops caused by our own transitions, such as entering or leaving water; - clean up stray override animations left from other states; - use a base sit pose under sits, and step aside for foreign seat animations. - transient states (landing, standing up, pre-jump) keep the stock motion with the override layered on top where that looks right. 3. **Region change:** re-send the current state's override immediately on arrival. 4. Keep the existing deferral rules: scripted AOs (`PAUSE_SERVER_AO`, `PAUSE_SCRIPTED_AO`), Pose Studio, user pause and the `/ao` commands. ## Done when - [ ] Stand / walk / run / fly / jump / land / sit transitions show no default-animation frames, for you and for observers. - [ ] A region crossing or teleport keeps the current override with no gap. - [ ] Scripted AOs, poseballs and Pose Studio still take precedence as today.

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2026-10-11 05:32:54 +00:00

sky_line added this to the Slipstream project

2026-10-11 05:32:54 +00:00

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2026-10-18 22:32:43 +00:00

sky_line changed title from ~~Built-in AO: server-side overrides through the Slipstream LSL bridge (llSetAnimationOverride), viewer-side fallback~~ to Built-in AO: seamless state changes (no default-animation flash, sit / transition guards, instant re-send on region change)

2026-10-18 23:15:12 +00:00

sky_line referenced this issue from a commit

2026-10-19 01:29:02 +00:00

Client AO: seamless state changes (#668)

sky_line referenced this issue from a commit

2026-10-19 01:29:02 +00:00

Client AO: drop kept-off built-ins that left the avatar's lists (#668)

sky_line referenced this issue from a commit

2026-10-19 01:29:02 +00:00

Merge #668: client AO seamless state changes (synchronous intercept, transition guards, instant region re-send)

sky_line commented

2026-10-20 15:03:20 +00:00