# CONVTOSOLID [GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [What's new](Help%20System/GSTARCAD/2022/What's%20new/(What's%20new).md) → [Additional Pages](Help%20System/GSTARCAD/2022/What's%20new/Additional%20Pages/(Additional%20Pages).md) You can input the CONVTOSOLID command or click Ribbon – Mesh – Mesh Convert – Convert to Solid to convert eligible objects to 3D solids. You can select one or more objects to convert to solid, if any object in your selection set is in invalid for the command, you will be prompted again to select the objects. **Eligible objects include:** - 3D meshes that completely enclose a volume - Surfaces that completely enclose a volume - Closed polylines and circles with a non-zero thickness property; wide polylines must have a uniform width **The Command has following limitations:** - It’s not available to convert planar surfaces or regions with contiguous edges to 3D solid. - It’s not available to convert separate objects to 3D solid. **SMOOTHMESHCONVERT:** System Variable, only supports value 3\. Smoothness and optimization effect won’t be supported in the version.