Parameters
- point
- The point to add. The z-value of the point is used for the TIN.
- tagValue
- The tag value for the new node. A value of 0 will result in no tag assignment.
Return Value
The index of the newly added node. It will be one larger than the previous node count
if the point is successfully added. It will be equal to the value of the existing node if it is snapped to it.