Picking up from the previous Notre Dame post.

During the week I had assisted one of our architects with a tricky stair detail. The only way I could get the curved glass balustrade to reflect the design intent moderately well was to create multiple in-place swept blends. A bit of a hack, like the photoshop-compiled image shown here, but I quite enjoyed doing it. 

It brought back memories of the spiral stair family that I developed in 2012, and I decided to try using this for the spiral stone stairs that occur in several places at Notre Dame. I guess these are the equivalent of the modern service lift. 

The upgrade from 2012 to 2020 went smoothly enough, but it is a bit sluggish to respond to changes in parameters. Not all that surprising given that the treads are generic models nested into curtain panels on a divided spiral surface. 

At the sides of the Bell Towers, I think I have the levels of the landings more or less right now. Had to drop the upper vault down so…

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