# MATLIB [GstarCAD 2019](Help%20System/GSTARCAD/2019/Index.md) → [Commands](Help%20System/GSTARCAD/2019/Commands/(Commands).md) → [M](Help%20System/GSTARCAD/2019/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 2018](Help%20System/GSTARCAD/2018/Commands/M/MATLIB.md)