The sum of two points is undefined, and this is preserved in homogenous coordinates with the sum of two points having a w-coordinate of 2. This is invalid, as homogenous coordinates should only ever have a 0 or 1 in the w-coordinate.
The sum of two points is undefined, and this is preserved in homogenous coordinates with the sum of two points having a w-coordinate of 2. This is invalid, as homogenous coordinates should only ever have a 0 or 1 in the w-coordinate.