Preview was animation package that referenced OBJ files from disk, managed hierarchies and assigned animated channel data to attributes such as translation and rotation. It allowed association of primitive non-linear deformations such as bends and waves to geometry. It lacked a native undo feature. Like Model, included a command language that allowed for alias, or script development to automate tasks such as 'undo'. Other features included placement and preview of lights, manipulation of OBJ MTL files, and facilitation of scanline or wire frame rendering via an external render module. A unique feature to draw every Nth polygon of a model, was essential for visualizing animation of 'heavy' scenes during manipulation.