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:

Figure: Unions of spheres
Image /home/andreas/tex/Books/computer-graphics/img//obj-union.png

Andreas Kriegl 2003-07-23