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4.1 General program structure

It has the following schematical structure:

• Definition of the display context;
  • Definition of the terminal on which the image will be displayed;
  • Definition of windows and masks;

• Definition of transformations to be applied to the object;
  • Linear transformations: rotations, translations, ...;

• Description of the image;
  • Definition of segments, facets, text, ...;

• Display the image.

We note that the major difference between the plane case and the above concerns the definition of the transformations, which did not exists in the 2D case.

The structure of these subroutines will be described in more detail later on.