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Encoding Design Rules

 
Proportion has been an important consideration in the design of objects for centuries. Relating width, height, and depth to a design rule informed the design of architecture dating back to early Greek and Egyptian times. The dimensional size of one element often drives the size of other related elements. Think, for example, of a window with muntins; the number of muntins often grows in proportion to the size of the window (Figure 10.29). To this end, Revit provides ways to relate parameters to one another using formulas. By changing one dimension of a component, you can effectively change many other dimensions and thereby maintain design intent. Often, your family will have parameters that determine its dimensions, and it’s the relationship between these dimensions that you want to maintain.
Figure 10.29
Window with muntins added as function of width and height.