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UCS icon
An icon that indicates the orientation of the UCS axes. (UCSICON)
underconstrained geometry
Objects with unsolved degrees of freedom are underconstrained.
underground
The XY plane of the user coordinate system when perspective projection is
turned on and when viewed from below ground. The underground plane
displays with a color gradient between the earth horizon (nearest to the
horizon) and the earth azimuth (opposite the horizon). See also ground plane
and sky.
up direction
A vector defining what direction is Up. By default this is the positive Z – axis
(0,0,+1).
The up direction and the north direction are always constrained such that
they are perpendicular to each other.
user coordinate system (UCS)
The active coordinate system that establishes the XY plane (work plane) and
Z-axis direction for drawing and modeling. You can set the UCS origin and
its X, Y, and Z axes to suit your needs. See also world coordinate system (WCS).
user parameter
Named user-defined variable (real number or an expression) that can be used
in expressions for dimensional constraints or other user parameters.
UVW
The material’s coordinate space. Used instead of XYZ because that is usually
reserved for the world coordinate system (WCS). Most material maps are a 2D
plane assigned to a 3D surface. The U, V, and W coordinates parallel the relative
directions of X, Y, and Z coordinates. If you look at a 2D map image, U is the
equivalent of X, and represents the horizontal direction of the map. V is the
equivalent of Y, and represents the vertical direction of the map. W is the
792 | Glossary
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