3D Printing a Shadertoy SDF

Recently I acquired an Elegoo 3D printer from a friend. While I’ve never got interested in 3d printing enough that made me go ahead and buy one, there were certainly projects in the back of my head, just waiting for the right opportunity. One of them was printing some of the objects I modeled for my Shadertoy shaders. The whole challenge was understanding how to convert SDFs into actual meshes that could get sliced and printed. In this text I’m describing my process going through that. Night Sneaking is a shader I wrote in 2020, displaying a character sneaking out of a trash bin Coincidentally, just a few days after I got my hands on that printer, someone posted about this project Halfspace on Hacker News: Halfspace is an experimental IDE for solid modeling with distance fields. Halfspace is a showcase app for the Fidget kernel, which is used for rasterization and meshing. Within the GUI, images are rasterized in real(ish)-time; models can be exported as either images or triangle…

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