# 3D [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [System Variables](Help%20System/GSTARCAD/2021/System%20Variables/(System%20Variables).md) ## Topics - [3DCONVERSIONMODE System Variable](Help%20System/GSTARCAD/2021/System%20Variables/3D/3DCONVERSIONMODE%20System%20Variable.md) - [3DDWFPREC System Variable](Help%20System/GSTARCAD/2021/System%20Variables/3D/3DDWFPREC%20System%20Variable.md) - [3DOSMODE System Variable](Help%20System/GSTARCAD/2021/System%20Variables/3D/3DOSMODE%20System%20Variable.md) - [3DSELECTIONMODE System Variable](Help%20System/GSTARCAD/2021/System%20Variables/3D/3DSELECTIONMODE%20System%20Variable.md) - [System variable with 3D letter](Help%20System/GSTARCAD/2021/System%20Variables/3D/System%20variable%20with%203D%20letter.md)