                     The Particle-System
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 Dust creates Particle-objects using two objects:
  -a structure-object (particle-positions, -sizes)
  -a shape-object (particle-shape).
 The object-attributes are taken from the shape object, too.
 There are two modes to force the particles:
  -point-mode: every point of the structur-object gets a particle,
               the size is calculated comparing the volumina
  -face-mode : every face of the structure-object gets a particle
               (centered), the particle-size is calculated using
               the face-size
 If the parameter ALIGNP set to TRUE Dust will try to align the
 x-axis of the particles along the face-normals.

 A very nice feature is to create sphere-objects using only one
 object (structure).
 This sphere-objects are treated as normal particle-objects (saving,
 loading, exploding, etc.) but must be saved as TDDD-Group
 using the SAVESPHERES-command (You can't join real spheres).
 That means you can't load this objects into Dust again  - so don't 
 forget to save the objects as particle
