/// <summary>
/// In case of a Boolean operation failure, provide a recommended direction to shift the geometry in for a second attempt.
/// </summary>
/// <param name="lcs">The local transform for this entity.</param>
/// <returns>An XYZ representing a unit direction vector, or null if no direction is suggested.</returns>
/// <remarks>If the 2nd attempt fails, a third attempt will be done with a shift in the opposite direction.</remarks>
public XYZ GetSuggestedShiftDirection(Transform lcs)
{
XYZ suggestedXYZ = (SecondOperand == null) ? null : SecondOperand.GetSuggestedShiftDirection(lcs);
if (suggestedXYZ == null)
{
suggestedXYZ = (FirstOperand == null) ? null : FirstOperand.GetSuggestedShiftDirection(lcs);
}
return(suggestedXYZ);
}
