Show HN: Ray Tracing in One Weekend v4.0.0

The "Ray Tracing in One Weekend" series consists of free online books released under the CC0 license, making them nearly public domain. The series aims to teach ray tracing through practical coding exercises, allowing readers to create visually appealing images without relying on complex APIs. The first book, "Ray Tracing in One Weekend," guides readers in building a simple brute-force path tracer. The subsequent book, "Ray Tracing: The Next Week," expands on this by introducing textures, volumes, and a bounding volume hierarchy (BVH) for managing multiple objects. The final book, "Ray Tracing: The Rest Of Your Life," delves into the mathematical foundations necessary for developing a more advanced ray tracer. The series is designed to prepare readers for working with professional ray tracing software used in the film and product design industries. Source code for the books is available on GitHub, where users can also report issues or suggest improvements. Contributions to the project are welcome, but potential contributors are advised to follow specific guidelines to ensure their submissions are considered. The books can be read directly in browsers, printed, or saved as PDFs, making them accessible for a wide audience interested in graphics programming.