NAME

DoBackfaceCullable − Create a primitive attribute object defining backface cullability

SYNOPSIS

C:

DtObject DoBackfaceCullable(switchvalue)
DtSwitch switchvalue;

FORTRAN:

INTEGER∗4 DOBFC(SWVAL)
INTEGER∗4 SWVAL

DESCRIPTION

DoBackfaceCullable creates a backface cullability primitive attribute object.  Backface cullability is a surface property of a primitive object.  The switchvalue parameter specifies whether subsequent primitive objects will render more efficiently if their backward facing surfaces are ignored before shading and rendering takes place.  The actual backface culling cannot take place until the DoBackfaceCullSwitch <DOBFCS> is enabled. 

DEFAULTS

The default value for DoBackfaceCullable is DcOff <DCOFF>. 

SEE ALSO

DoBackfaceCullSwitch(3D), DoHiddenSurfSwitch(3D)

September 02, 1992