# How to compute extents for model space?

 1. [FAQ](/ja/faq)
2. »
3. [Examples](/faq/examples)

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).