# System variable with 3D letter [GstarCAD 2017](Help%20System/GSTARCAD/2017/Index.md) → [System Variables](Help%20System/GSTARCAD/2017/System%20Variables/(System%20Variables).md) → [3D](Help%20System/GSTARCAD/2017/System%20Variables/3D/(3D).md) - [3DCONVERSIONMODE](3DCONVERSIONMODE%20System%20Variable--fcb11827c31a.md "3DCONVERSIONMODE") - [3DDWFPREC](3DDWFPREC%20System%20Variable--d085bafd8958.md "3DDWFPREC") - [3DOSMODE](Help%20System/GSTARCAD/2020/System%20Variables/3D/3DOSMODE%20System%20Variable--df1be9c3d45d.md "3DOSMODE") - [3DSELECTIONMODE](Help%20System/GSTARCAD/2020/System%20Variables/3D/3DSELECTIONMODE%20System%20Variable--f15f0848e88e.md "3DSELECTIONMODE") ---