Autodesk 00128-051462-9310 User Guide - Page 1764

Property Usable Perimeter Usable Perimeter Including Interferences Volume Above Ceiling Volume Below Floor Volume Overall Wall Area Width Description Perimeter of the usable boundary Perimeter of the usable boundary including the length created by interference conditions. For more information, see "Creating Interference Conditions for Spaces" on page 1646. Volume of the space above the ceiling boundary. All volumes are calculated from the base volume. Volume of the space below the floor boundary. Overall volume of the space including ceiling and floor boundaries, and the volume above the ceiling and below the floor. The area of the wall sides. Used for example in paint and plaster calculations. Width of the space Calculation Modifiers A calculation modifier is a formula that you can apply to a space to change the calculated results of its associated area or perimeter values. Calculation modifiers can also be applied to a zone to change the calculated results of all spaces attached to that zone. You might want to change calculated results for number of purposes; for example, to account for plaster deductions or the tiling in a bathroom. By default, a calculation modifier is applied only to the base area and base perimeter of the space. To apply the modifier to the net, usable, and gross boundaries of a space, you need to create and apply a property set definition that contains properties for the calculated area and perimeter values of the those boundaries. For more information, see "Property Set Definitions" on page 2069. Calculation modifiers work cumulatively. When you apply several different modifiers to a space or a zone, they are all applied. Therefore, it is important to define the order in which they are used. Example: You have a space area of 25 square meters. You want to apply 2 different calculation modifiers to it. Calculation modifier A deducts a value of 0.3 square meters for a column. Calculation modifier B divides the space by 2 (in some international calculation schemes, this is used for calculating balconies). ■ If you apply the plaster deduction first and the division second, you get the following result: Calculation Modifier A: 25 m2 - 0.3 m2 = 24.7 m2 Calculation Modifier B: 24.7 m2 / 2 = 12.35 m2 ■ If you apply the division first and the plaster deduction second, you get the following result: Calculation Modifier B: 25 m2 / 2 = 12.5 m2 Calculation Modifier A: 12.5 m2 - 0.3 m2 = 12.2 m2 You can set the order of calculation modifiers in the properties of the space. For information about ordering calculation modifiers, see "Adding and Removing Calculation Modifiers for Spaces" on page 1724. Adding and Removing Calculation Modifiers for Spaces Use this procedure to attach, detach, or sort calculation modifiers for spaces. Calculation modifiers are values and formulas that can be applied to the area and perimeter values of a space to modify them. By default, a calculation modifier is applied only to the base area and base perimeter of a space. To apply the modifier to the net, usable, and gross boundaries of a space, you need to create and apply a property set definition that includes properties for these boundaries. For more information, see "Property Set Definitions" on page 2069 1 Select the spaces you want to attach a calculation modifier to, and double-click one of them. NOTE This procedure can be applied to multiple spaces only when they all have the same modifiers attached in exactly the same order. 2 On the Properties palette, expand Basic, and expand General. 3 Click the setting for Calculation modifiers. 1724 | Chapter 36 Spaces