Specifying the Variable Light Meter Aiming Point
When specifying a variable light meter, you have the opportunity to select the light meter aiming point in Model View with the mouse. You will be returned to the Add Calculation Points dialog once the aiming point is defined and its relative coordinates will be entered into the appropriate cells.
Locate the aiming point in Model View and click the left mouse button. You may change the Z coordinate of the aiming point (before left clicking) by moving the cursor into the Variable Location - Z coordinate form and entering a new value.