Octagonal Dome

[dlkelecha]

I'm trying to create a domed roof for an octagonal building. I've tried creating a mass, but it wouldn't let me make the shape I wanted. What's the best way to go about creating this structure? 

[barthbradley]

Polar Array a Wedge.  

[Mike.FORM]

You can use the trajectory segmentation for sweeps to do this. This option is only available for curved sweep paths. Here is an example of a hexagonal dome. If you set the "max segment angle" to 45 you will get an octagonal dome.

 

[lucdoucet_msdl]

Simply, a sweep form with an octagonal path (item 1) and a sectional profile sketched in place (item 2).

Create a Sweep Form

-luc

[lucdoucet_msdl]

If your octagonal base is unequal, two different edge lengths as in art-deco domes, you can array a set of two wedges (items A and B) that are extrusions cut by a vertical extrusion void (item D for wedge A, void for B not shown). The profile for the small wedge B is created by picking the edge of wedge A while creating the extrusion as it has a different profile than that of the longer wedge A.

Group the wedge A and B then and polar array the repetitive quarter (item D) 4 times at 90° into the result.

Hope this helps,

-luc