A cousin to geometry
, stereometry is the area measurement
of irregular three-dimensional figures
, such as statues
This was used by the Levi corporation during a period when they were manufacturing jeans designed to the specific fit of the wearer.
This is also used for mapping faces for use in virtual reality simulations, and I recently found a group using a stereometer to map people's faces in preparation to carving out a block with their three-dimensional image.