Autodesk 12812-051462-9011 User Guide 3 - Page 2921

World Space (Biped) When you use freeform animation on page 7988 to animate a biped, you can place a biped limb into the space of another object, or into world space. For example, if the biped's feet are in world space, then when you move the center of mass, the feet stay planted in the same location. World-Space Modifiers (WSM) World space is the universal coordinate system that applies to the entire scene. A world-space modifier, as opposed to an object-space modifier on page 8066, affects an object but uses world coordinates. A world-space modifier always appears at the top of the modifier stack on page 1090. Its effect is independent of its order in the stack. See also: ■ World-Space Modifiers (WSMs) on page 1113 xref (AutoCAD External Reference) An AutoCAD external reference. An xref is a variation on a block. A block is a collection of geometry that is identified by a unique name, is stored in the AutoCAD symbol table, and essentially behaves as if it is a single object. Xrefs share block characteristics, and they are similarly defined in the symbol table. However, unlike blocks, the geometry associated with an xref definition is not stored in the current AutoCAD drawing; it is stored in another AutoCAD drawing file. Like a block, there can be many instances of an xref in a AutoCAD drawing, but only one definition. Typically, xrefs are used to display the geometry of a common base drawing in the current AutoCAD drawing without expanding its size. This allows changes to the reference drawing to be reflected in any host AutoCAD drawings that refer to it. See also: ■ XRef (3ds Max Externally Referenced File) on page 8177 8176 | Glossary