engine v4.5.2

Engine v4.5.2

May 27, 2026

A patch in the Surface Tension line.

what's new

Animated models always play something — falls back to an available animation instead of standing still.
Savi can now catch editing mistakes that made parts of your world disappear or stop moving.
Savi uses clearer, more specific commands when editing your world's atmosphere, terrain, camera, and other settings.

›technical notes

Fixed silent T-pose when a draw/mixer channel references a clip name that doesn't exist exactly on the loaded model. Renderer now substring-matches (e.g. walk → Walking) and falls back to the first usable clip; skips rest-pose placeholders (zero duration, empty tracks, or every-track-single-keyframe).
Reject misplaced api.spawn() fields transactionally and make invalid pathless api.patch() calls report the runtime mutation API directly to Savi.
BREAKING: Removed api.patch(path: string, value: Record<string, unknown>) from ObjectAPI.
Restored eight per-slice patch methods: patchAtmosphere, patchTerrain, patchPlayer, patchCamera, patchInputs, patchGodMode, patchUi, patchEngine.
Per-place targeting uses the second argument again: api.patchTerrain(p, "main") and api.patchAtmosphere(p, "main") replace the dot-path form.
Internal recorded mutation kind tags unchanged — persistence/replay/serialization stay stable.

engine v4.5.2

May 27, 2026

A patch in the Surface Tension line.

Animated models always play something — falls back to an available animation instead of standing still.
Savi can now catch editing mistakes that made parts of your world disappear or stop moving.
Savi uses clearer, more specific commands when editing your world's atmosphere, terrain, camera, and other settings.

›technical notes

Fixed silent T-pose when a draw/mixer channel references a clip name that doesn't exist exactly on the loaded model. Renderer now substring-matches (e.g. walk → Walking) and falls back to the first usable clip; skips rest-pose placeholders (zero duration, empty tracks, or every-track-single-keyframe).
Reject misplaced api.spawn() fields transactionally and make invalid pathless api.patch() calls report the runtime mutation API directly to Savi.
BREAKING: Removed api.patch(path: string, value: Record<string, unknown>) from ObjectAPI.
Restored eight per-slice patch methods: patchAtmosphere, patchTerrain, patchPlayer, patchCamera, patchInputs, patchGodMode, patchUi, patchEngine.
Per-place targeting uses the second argument again: api.patchTerrain(p, "main") and api.patchAtmosphere(p, "main") replace the dot-path form.
Internal recorded mutation kind tags unchanged — persistence/replay/serialization stay stable.