BIM TroublemakerRevit ComponentsRevitADAPTIVE SPIRAL STAIRSI was looking through Zach Kron's parametric patterns series, which is still available on his Buildz website, and well worth a look if you missed it. The INCREMENT SPIRAL caught my eye and I started wondering "how would I convert this into a fully parametric spiral stair" I took the family that Zach created: just a spiral line, with parameters for height, radius, rotation angle. (You can vary the top and bottom radius separately to make a cone, but I just wanted a cylinder.) The goal was to make a spiral surface, divide it, then populate it with curtain panel families that emulate stair treads. My first attempt at a surface turned out to be a DNA style double helix. Tried out a curtain pattern family with a cylinder on one edge. Curtain pattern families are designed to lie in the plane of a curved or twisted surface. So far so good and I was getting excited. Why not make the whole tread assembly as a nested component and simply align it with the vertical line ?
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