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https://github.com/robertmuth/Microcosm
https://github.com/curv3d/curv/blob/master/ideas/v-rep/To_Me...
I've also written up a 2D study of Marching Cubes (Squares) vs Dual Contouring:
The author, Mikola Lysenko, is a remarkable engineer. He's wildly prolific, but I my favorite project of his is regl[1], which is an unparalleled WebGL library. I think it might be the best-in-class example of all OpenGL libraries, though I have admittedly fallen behind on the state-of-the-art of desktop OpenGL.
[1] https://github.com/regl-project/regl
As a generalist trying to develop a CAD system using SDF and functional representation, the details of isosurface extraction are interesting to me (if somewhat tedious at times). Researching the bigger picture, tying together the concepts of representation, rendering, analysis, manufacturing, etc. is my rabbit hole.
For those of you that don't know, mkeeter has developed Libfive--a well-regarded project which performs isosurface extraction of implicit functions to triangular meshes--so we can render them with OpenGL or print them on a 3D printer, for example. The implicit functions can be implemented at several language layers, including C, C++, and Scheme.
https://github.com/libfive/libfive