The aesthetic appeal of a product is dependent on many variables but the smoothness or continuity
between surfaces is a key factor. Light reflected from the part surfaces provides visual cues to the
change in curvature between adjacent surfaces. Sharp edges are easily identified, but even small
variations in curvature are discernible, especially on glossy or highly reflective surfaces. Control of
surface curvature is a key component in the creation of appealing designs. Of course not every design
has the same requirements for surface smoothness and continuity. With a good understanding of
curvature and continuity, you can choose the correct modeling tools and techniques to generate
designs with the appropriate level of surface quality.