The source code is available on GitHub and it indeed does seem to use ray-marching https://github.com/HackerPoet/MarbleMarcher/blob/d436b6f80068cfee6b00b515cb4

The source code is available on GitHub and it indeed does seem to use ray-marching https://github.com/HackerPoet/MarbleMarcher/blob/d436b6f80068cfee6b00b515cb4c0b2704d49afe/assets/frag.glsl#L199 https://github.com/HackerPoet/MarbleMarcher/blob/d436b6f8006...