How to compute extents for model space?

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See AbstractViewPE.h. This protocol extension can be applied to OdDbViewport, OdDbViewportTableRecord, OdDbViewTableRecord.

You can find sample code in Kernel/Examples/Exports/RasterExport. AbstractViewPE in its zoomExtents() and viewExtents() takes into account only visible geometry honoring layers state (if layer is off or frozen).