# !-- InstanceBeginEditable name="EditRegion_Title" --\> MATLIB [GstarCAD 2018](Help%20System/GSTARCAD/2018/Index.md) → [Commands](Help%20System/GSTARCAD/2018/Commands/(Commands).md) → [M](Help%20System/GSTARCAD/2018/Commands/M/(M).md) Cancel the modification to materials. Command Access: > **Command entry:** MATLIB Function Description: > When a model is rendered, specifying materials to objects provides a realistic effect in the rendered view. ## Other versions with matching text [GstarCAD 2019](../../../2019/Commands/M/InstanceBeginEditable%20name-EditRegion_Title-%20---%20MATLIB--a943f9b11d36.md)