3D model used by PowerFlip, a program used to view and rotate three-dimensional models; may include polygons, quad-meshes, NURBS, texture coordinates, and object properties; supports colors for objects, facets, and vertices.
YDL is short for YAODL, which is an acronym for "Yet Another Object Description Language." Silicon Graphics, the developer of the YAODL file format, no longer uses YAODL files.
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