Name
twosided — Is a normal surface two-sided?
Description
A twosided element stores whether or not a normal surface is
two-sided.
Parents
The following elements contain twosided:
surface.
Children
Element twosided has no children.
Attributes
value
Either T or F, according to
whether the parent surface is two-sided or one-sided respectively.
Past versions of Regina (versions 4.92 and earlier) used
true or 1 instead of
T, used
false or -1 instead of
F, and also used
unknown or 0 to indicate
that this property was unknown.
