Unit
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A unit is the generic measurement used by all 3D software to measure distances and define coordinates.
A unit's relationship to real-world measurements is not set in stone or precise; it is defined only by the scale of a game's content.
- Units in Id Software and
Valve engines are referred to as quake units (qu) or hammer units (hu), and are usually loosely analogous to roughly 1 inch, 0.75 inches, or 2-3 centimeters (see Dimensions). 
Blender refers to units equaling meters by default, but this can be changed.- The
glTF model standard (supported by 
Source 2's tools and most modern modeling software) requires units to equal meters, but not all software respects this.
See also
- Dimensions (for a unit's size in various games)