Geodesic Help Group dome discussion • When choosing a geodesic subdivision method for a dome, the ground truncation can be problematic • Two subdivision methods are compared, in this model: Class-I, 3v, Method-1 (tan), vs. (blue) Class-I, 3v, Method-Kruschke (David Kruschke, "Dome Cookbook of Geodesic Geometry", 1972) • Method-1 subdivision produces three chord factors, and dome truncations at the 4/9ths & 5/9ths levels produce a ground, or foundation, tier of struts that do not lie flat on the ground • Kruschke's Method produces four chord factors, and the ground tier of struts is level, lying flat on the ground, without any additional modifications to the geometry • This makes a Kruschke 3v dome easier to build, as the foundation is level • The four chord factors are more divergent than the typical Method-1 chords, but the differences are minor • The radii of the domes/spheres are unity (1.0), so chord factors can be measured directly from this model, as can face, dihedral and central angles #buckminster #bucky #dome #fuller #Geodesic #icosahedron #kruschke #polyhedra #polyhedron #tessellation
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