I realized that the Z-Buffer stores the depth of
a rendered pixel. When rendering multi-resolutional
Locales (solar-system and satellite), the Z-Buffer
runs into precision problems.

Can anybody tell me:

- what floating point type is used for Z-Buffer or how 
  can it be modified? I think it depends a lot on the
  graphics card as well?!

- why should the front-to-back clip distance ratio be
  below 100 or at least less than 3000? How did they come
  up with these numbers?
  (Java 3D spec, page 223)

Thanks heaps,
 Thomas
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