I’m working on a ray tracing project in Python and want to include custom shapes, such as a human body, in my scenes. While basic shapes like spheres and cuboids are straightforward, I’m struggling to figure out how to implement more complex shapes.

I’ve explored various resources (e.g. this), but most examples focus on basic geometric primitives. I would appreciate guidance or code snippets that demonstrate the process of defining and rendering a custom, non-trivial shape.