How to Draw a Parametric Octagonal Component in Revit
1. Begin by clicking on the Create tab. Under the Stretching commands, select External Polygon and draw an octagon centered on a circle.
2. Next, go to the Annotation tab and use the Align command to annotate the length of one octagon edge. Add a parameter named Octagonal Side Length. (Note: When annotating dimensions, be sure to select the endpoints for alignment, then select the centerline to evenly divide the edge length.)
3. Repeat this process to label the other three sides using the same method, as illustrated below. (Again, select the endpoints carefully for alignment.)
4. Then, measure and mark the distance between two opposite endpoints. Add dimensions and divide this length equally using the centerline. Name this dimension Octagonal Diameter.
5. Open the Family Types dialog box and edit the formula for Octagonal Diameter as follows:
Octagonal Diameter = cos(45°) × Octagonal Side Length × 2 + Octagonal Side Length
This formula is shown in the figure below.
Finally, label the remaining three sides in the same way, completing the parameter setup for the octagonal diameter.
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