UNION — Union

Merges several solids into one.

• Command: UNION · Global name: _UNION · Alias: UNI
• Ribbon: Home › Modify

Merges several 3D solids into one (boolean union), like AutoCAD's UNION. Between polyhedra it is computed by an in-house BSP modeler (pure Rust), exact even with coplanar faces; the result is stored as an ACIS 3DSOLID.

Usage

1. Type UNION or click it in the ribbon.
2. Select two or more solids and press Enter.

Select the solids and press Enter:

The selected solids are replaced by the union solid. The result keeps the properties (layer, color, material…) of the first solid selected.

Notes

• Between polyhedra (planar-faced solids) the result is exact: AutoCAD audits it with no errors and MASSPROP reports the exact volume, also with coplanar faces (walls flush at the top and bottom, solids touching along a face).
• Solids with curved faces (cylinders, spheres…) are not yet supported in booleans; they come in a later phase.
• See also SUBTRACT, INTERSECT, EXTRUDE and REVOLVE.