Trimmed and Blended NURBS Objects

Trims and blends are element of the classic Maya character-modeling paradigm. Maya uses curves projected on a NURBS surface to determine areas that are out of sight from view. These out of sight areas are called trims. You can connect these holes relatively effortlessly to additional objects with blends. Blends are pieces of geometry that are interactively generated between two curves or isoparms. As each curve moves,

the blend follows. Resembling lofts, these curves also maintain a certain amount of tangency with their generating surfaces. Because there are fewer surfaces generally, trimmed and blended surfaces are usually easier to texture map. Unluckily, when activated, they sluggish animation unacceptably and are impracticable for interactive performance.