5.5.1 Union

The syntax of a union is:

UNION:
  union { UNION_OBJECT ... UNION_OBJECT [UNION_MODIFIERS] }

UNION_OBJECT:
  OBJECT | LIGHT

UNION_MODIFIERS:
  [split_union BOOL] & [OBJECT_MODIFIERS]

See also:

• [pov:6.5.6.2]Union
• [pov:3.3.2]CSG Union

Figure: Unions of spheres