Brlcad/How to mged/region

Shape regions are created by performing boolean geometric /union/, /intersection/ and /subtraction/ operations.

Creating a region from a list of shapes
The r command is used to create a region from a list of shapes. Note that the shapes must have been created in the database for the operations to work:

r region1.r u sph1.s sph2.s
 * 1) Create a region named region1.r that consists of a union
 * 2) of the objects sph1.s and sph2.s