02/19/2002
15-462 Graphics I
7
Parametric Form for Surfaces
•Use
parameters u and v
•x =
x(u,v), y = y(u,v), z = z(u,v)
•Describes
surface as both u and v vary
•Partial
derivatives describe tangent plane at each point p(u,v) = [x(u,v) y(u,v)
z(u,v)]T