A shell (Jeener surface 1) [Un coquillage (surface de Jeener 1)].

The parametric equations of the Jeener surface 1 are:

                    F (u,v) = e  (1+cos(v))cos(u)

ku F (u,v) = e (1+cos(v))sin(u) y
ku F (u,v) = e (2+sin(v)) z

                    k = --------

u E [-2.pi,+2.pi]
pi v E [- ----,+pi] 2

The attributes of each sphere are chosen as follows:

                    RADIUS = constant

dF (u,v) dF (u,v) x x RED = 1 - K (----------Du + ----------Dv) R du dv
dF (u,v) dF (u,v) y y GREEN = 1 - K (----------Du + ----------Dv) V du dv
dF (u,v) dF (u,v) z z BLUE = 1 - K (----------Du + ----------Dv) B du dv

                    Du = ------

3.pi Dv = ------ 200

The atomization process (displaying a continuous object with a finite number of colored spheres) reveals the intricate inner details of the surface without the ambiguities of transparencies, when the apparent variation of the size of spheres (due to the projection) gives a good depth cue.

See an artistic variation on a geometrical inversion of this shell.
See a special shell.

(CMAP28 WWW site: this page was created on 10/08/2002 and last updated on 06/18/2020 11:25:57 -CEST-)

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