There is also a set of vector drawing tools intended for inking, which, like the raster tools, can be configured to be pen pressure-sensitive. Work can be done on separate layers, which can be grouped and have opacity masks. In addition to this, layers can be masked by clipping them to a lower layer. This allows one to add shading and highlights to an area without creating new masks for the additional layers. There is also a pen movement and pressure smoothing feature which can be manually configured as to how much effect it has.