![]() These distortions cause some subtle inconsistencies in the pattern of triangles by analyzing the inconsistencies, we can reverse-engineer the pattern. However, this is not the case if it were, Spaceship Earth would be flat! Each triangle is precisely distorted to make the structure spherical. photo: By Katie Rommel-Esham, CC BY-SA 3.0 us, Īt first glance, the surface of Spaceship Earth seems to consist of perfect, uniform triangles. The source code is available to download at the end. If you are interested in how the program works, keep reading. ![]() The STL model of Spaceship Earth is available to download right here feel free to 3D print it, even if you don't read the rest of this tutorial :). That being said, this isn’t a tutorial on programming to fully understand what’s going on, you’ll need at least some prior programming experience (any language is fine), as well as some familiarity with vectors. My hope is to explain things well enough for you to intuitively understand how the program works. This tutorial explains the design-and the important concepts that went into the design-of that program. I used no APIs or outside libraries (except for the C standard library, of course). I wrote a small C program that calculates and outputs an STL file of Spaceship Earth. Not Fusion 360, not FreeCAD, and not even OpenSCAD! The 3D-print in the title photo came from a computer-model made without the use of a solid-modeling CAD program. Wait a minute, did you say “without CAD software”? This tutorial will explain my process for 3D modeling Spaceship Earth, the 180 ft tall aluminum-clad geodesic sphere at EPCOT Center in Florida, without the use of CAD software. ![]()
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