For objects drawn on the top view of the model with two Z coordinates, ObjectVerticalLength returns the vertical length of the object within the grid or mesh. In most cases that will be the Higher Z formula minus the Lower Z formula. For other objects, it returns 0.
This function in combination with ObjectVerticalIntersectLength can be used to distribute a value among several layers. ObjectVerticalIntersectLength/ObjectVerticalLength is the fraction of the vertical extent of an object intersected by the current cell or element.
