int ON_Box::IsDegenerate( double tolerance ) const
{
int rc = 0;
// 0 box is not degenerate
// 1 box is a rectangle (degenerate in one direction)
// 2 box is a line (degenerate in two directions)
// 3 box is a point (degenerate in three directions)
// 4 box is not valid
if ( !dx.IsIncreasing() || !dy.IsIncreasing() || !dz.IsIncreasing() )
{
rc = 4;
}
else
{
const ON_3dVector diag(dx.Length(),dy.Length(),dz.Length());
if ( !ON_IsValid(tolerance) || tolerance < 0.0 )
{
// compute scale invarient tolerance
tolerance = diag.MaximumCoordinate()*ON_SQRT_EPSILON;
}
if ( diag.x <= tolerance )
rc++;
if ( diag.y <= tolerance )
rc++;
if ( diag.z <= tolerance )
rc++;
}
return rc;
}
