[JAVA3D] setting up Normals ?

[Tiza Asterinadewi]

Title: setting up Normals ?

Hi,

        I'm still a newbie at Java3D, and I'm building up shapes but
I'm so
confused on Normals. What are Normals for ? I mean as far as I know
they are for lightning, but I don't know how to set it up ? How to
count Normals coordinates ? And texture coordinates ? Can anybody help
me ?
Thanks in advanced.

Tiza