posted 9 years ago
Geodesic domes in general have proven to be susceptible to leaking, which is very bad for dwellings, maybe not so much for greenhouses.
A more pertinent factor might be that a dome cannot be oriented to take advantage of sunlight; its facets will all be at different angles and any sun control techniques or movable insulation would have to be individually tailored to every panel. A standard shape can have a single treatment applied to an entire side at once, which makes control simpler and possibly more effective. Also, glass cut into triangles would likely have a lot of waste, even more than plywood or other panel materials. If it didn't have a high waste factor, there would be even more joints in exposed surfaces.