In the second round of Grasshopping, I was able to control four drivers for the Chair One design:
1. Thickness of each rib
2. Degree of filleting between the ribs
3. Chair height
4. Seat tilt (I wasn’t able to separate the tilt of the seat from the tilt of the back of the chair so the whole bucket seat unit tilts independent of the legs)
I’m a little behind on my blog posting … These are images from my first round of Grasshopping to drive the Chair One design in different directions.
I was able to vary the rib thickness and the degree of filleting between the ribs, but my Grasshopper file looked (and smelled) like a mess …
…Brep and surface unroll is coming soon – Case to the rescue again! Can’t wait to see what else they roll out… I wouldn’t be surprised to see some GH <> Revit wizardy. Here’s the teaser courtesy of The Proving Ground:
Here, I am experimenting with the extrusion and direction of the straps on the chair.
This is the proof that my strips end in a flat plane and al butt-up to eachother, there is a slider that adjusts the number of strips, which in turn also adjusts the individual thickness of each strip.
This image shows my first driver working correctly
My 3 drivers were:
1.) Having strips of wood that go across the surface so that the ends remain ‘solid’ with no gaps and the number of strips can beadjusted.
2.) Amount of ribs that make up the internal structure
3.)Width and Lenght of the ribs.
The second and third prooved to be quite simple, while the first took a lot of tinkering with to get correct
Parametrics 
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