Visualization of Surfaces in Four-Dimensional Space

: The authors discuss some issues of displaying two-dimensional surfaces in four-dimensional (4D) space, including the behavior of surface normals under projection, the silhouette points due to the projection, and methods for object orientation and projection center specification. We have implemented an interactive 4D display system on z-buffer based graphics workstations. Preliminary experiments show that such a 4D display system can give valuable insights into high-dimensional geometry. We present some pictures from the examples using high-dimensional geometry, offset curve tracing and collision detection problems, and explain some of the insights they convey. (kr)