Example 3D Primitives 2/3
•Curved surfaces with
implicit or parametric equations
(splines)
Implicit sphere:
x2 + y2 + z2 = r2
Spline curve:
x = at3 + bt2 + ct + d
y = et3 + ft2 + gt + h
z = it3 + jt2 + kt + l
Spline
curve
Spline patch with four
spline curves as boundaries