Cônes and Cylinders: Tangents, Shadows, and Generators

This lecture covers the apparent contours of cones and cylinders, focusing on tangent planes, clean and drop shadows, and contact generators. It explores the concept of clean shadow separators and the proper shadows cast by different objects. The lecture also delves into the intersection of lines and planes in 3D space, discussing examples and applications. Additionally, it addresses the points at infinity of a plane section of a circular cone, analyzing cases where conics are ellipses, parabolas, or hyperbolas. The lecture concludes with practical examples involving the construction of shadow separators and the representation of conic sections.