                      Dust-File-Formats
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1. TDDD - this is the standard-format read and written by Dust

    Features:
     -all Attributes can be read, written, modified
     -Imagine3.0-Textures and -Brushes can be read, written, modified
     -every face has its own color (CLST)
     -hard/soft edges will be treated correctly
     -subgroups are supported
    Restrictions:
     -reflection-maps are skipped (BRS4 ?)
     -the reflection- and transluceny-parameters are taken from
      the global atttributes (means: no RLST- and TLST-handling)

2. LW (Lightwave)

    Features:
     -polygons are assumed to be convex and converted into triangles
     -surfaces are converted into Imagine-Subgroups
     -the DOUBLESIDED-flag can be set by the BACKFACES-parameter
     -the specular level will be converted
     -storing all textures/brushes/...
    Restrictions:
     -no lines (polygons with 2 points) and point-polygons

3. MC4D (MaxonCinema4D)

    Features:
     -triangles, conversation of quadrangles into triangles
     -converting of axis-attributes
     -chunks with the identifier 8 are read and written
    Restrictions:
     -materials aren't supported because of no documentation
     -chunks of type 5,6,7 are skipped because of no documentation

4. VS (Videoscape) - loading and saving is slow (ASCII-format)

    Features:
     -Videoscape-colors are calculated as good as possible
     -creation of backfaces if the BACKFACES-parameter is set

5. SPHERES - TDDD-Group-Objects made of real Spheres
    This is a special particle-object-format (only for Imagine-users)
    and can only be written.

6. PARTICLE - The fast DUST-Particle-Format
    This Format consists of the particle- and the object-information
    in TDDD-format. So all attributes are supported.

The LOAD-command automatically recognises the format, all object-saving
procedures (e.g. SAVE or MORPH) create objects in the format specified
by the SFORMAT-parameter.

NOTE:  Dust converts LW-Surfaces into Subgroups and Subgroups into
       LW-Surfaces - most of the object-converters (e.g. Vertex, Pixpro,
       Castillian) aren't able to do that.
