...in 180 lines of bare C++ project is a compact educational ray tracing engine implemented in approximately 180 lines of C++ code, designed to teach the fundamentals of computer graphics. It serves as a hands-on learning tool rather than a production-ready renderer, focusing on clarity and simplicity over realism. The project demonstrates how basic rendering techniques such as ray-object intersection, lighting, and shading can be implemented from scratch. It intentionally avoids external libraries to encourage a deeper understanding of underlying algorithms and data structures. The codebase is small enough to be fully understood in a short time, making it ideal for students and developers new to graphics programming. ...