IFClite TypeScript API
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    Interface AppearanceChange

    interface AppearanceChange {
        after: readonly MeshData[];
        afterInstanced?: true;
        before: readonly MeshData[];
        beforeInstanced?: true;
        companionOriginals?: readonly MeshData[];
        geometryItemRemaps?: readonly { from: number; to: number }[];
        owner: AppearanceOwner;
        partition?: AppearancePartition;
    }
    Index
    after: readonly MeshData[]
    afterInstanced?: true
    before: readonly MeshData[]
    beforeInstanced?: true
    companionOriginals?: readonly MeshData[]

    Exact original geometry for a companion presence-only transition.

    geometryItemRemaps?: readonly { from: number; to: number }[]

    Explicit occurrence-local representation changes, captured before preview.

    A face-masked owner: its parts are repartitioned corner-for-corner (#4404).