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ARCHICAD 22 – Expression Defined Property Values – Overview


This video provides an overview of the new capability of using mathematical expressions when defining the values of Element Properties in ARCHICAD 22. ARCHICAD 22 offers the capability of specifying the values of Properties by defining a mathematical expression. The advantage of this new feature is two-fold. There is a Calculation Advantage, since new Properties can be defined for quantity estimations and calculations. You can also calculate quantities that otherwise would not be available as Schedule Fields, for example, calculate the number of bricks in Wall. There is also a Data Processing Advantage, because you can process Numeric, Text or Boolean element data and create Properties that contain the exact data desired and are in the exact format desired. You can, for example, create a new, custom Property for Doors that would contain their ID, Story Number and Orientation. Let us now activate the “Options… Property Manager” menu command to open the “Property Manager” Dialog. On the left pane of the Dialog, select any Property. In the “Value Definition” panel on the right… in the “Default Value” field, select the new radio button named “Expression”, which opens the “Expression Editor” Dialog. This is where you can specify the mathematical expression that defines the value of the Property. The Editor lets you use any Element Parameter or Property in your expressions. These are the same parameters and properties available as Schedule Fields. You can insert these using the “Parameter and Properties” button. In our example, we create a new Property, which will return the number of bricks in a Wall. For that we take the “Net Volume” of the Wall and divide it by the volume of a single brick, in this case using a brick size used in European countries. When using numbers in Expressions, we can use the “Units” button to insert length, area, volume and angle units of measurements after those numbers. We can also use the “Operators and Functions” button to insert any of the mathematical operators or functions available for Expressions. ARCHICAD offers dozens of these functions, which may be familiar to architects from spreadsheet applications. Our example Expression now divides the Net Volume of the Wall by the volume of a unit brick, and rounds up the result to the nearest integer value. After the Expression is created you can click the “OK” button to leave the Dialog, after which you can select any element and return to the “Property Manager” Dialog to evaluate the value returned by the Expression for the selected element by clicking the “Evaluate” button. Expression-defined Properties behave like any other Properties, and thus they can be used as criteria in the “Find and Select” Dialog… as Autotext in Labels as criteria when creating Graphic Override Rules as criteria during Collision Detection and as Schedule Fields. Please watch all other clips in the playlist as well to fully familiarize yourself with the capabilities of this new feature of ARCHICAD 22.

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