Parameters

tess
Specifies the tessellation object (created with gluNewTess).
which
Specifies the property whose value is to be fetched. Valid values are GLU_TESS_WINDING_RULE, GLU_TESS_BOUNDARY_ONLY, and GLU_TESS_TOLERANCE.
data
Specifies a pointer to the location into which the value of the named property is written.