Unit

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 or hammer units, and are usually analogous to roughly an inch (but not exactly).
• 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

• Quake unit
• Dimensions (for a unit's size in various games)