IFClite TypeScript API
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    Interface ResolveSpatialPlacementOptions

    interface ResolveSpatialPlacementOptions {
        sourceFrameOffset?: SpatialFrameOffset;
        targetFrameOffset?: SpatialFrameOffset;
        unknownVertical?: "refuse" | "assume-compatible";
    }
    Index
    sourceFrameOffset?: SpatialFrameOffset
    targetFrameOffset?: SpatialFrameOffset
    unknownVertical?: "refuse" | "assume-compatible"

    The default is fail-closed. Existing formats that genuinely cannot carry a vertical CRS may opt in explicitly while retaining an assumed result at their adapter boundary; absence is never silently considered a match.