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After Effects' Liquify shows Distortion ▸ Offset (x, y), and the renderer already applied distortionMeshOffset — sampling the mesh at layer coordinates minus the offset — but the parameter was declared hidden, so users could neither see nor edit it, and #1194 read as 'the effect does not work and the Offset option is missing'. It is now a visible 2D Point control (still defaulting to 0,0, still scriptable by its old path). Regression test: the spec exposes it as a Point, a [20,0] offset moves the displaced-region centroid right by the offset (the render differs, and the left of the shifted mesh is back to untouched pixels), docs/effects.md refreshed via UPDATE_DOCS.