Physical Elements

An object's physical elements are the physical properties that do not vary with the passage of time.

The physical elements are as follows.

• Name is the name, and has the symbol n. This is a text label used to identify the object and to distinguish it from other objects.

  The name may contain any characters and be of any length.

• Color is the color, and has the symbol c.

  The color may have any RGB components, although it is recommended that at least one of the RGB components should have a value of 255 (the maximum possible) if the luminosity is non-zero.

• Radius is the radius, and has the symbol r.

  The radius must be a number greater than zero.

• Luminosity is the luminosity, and has the symbol l.

  The luminosity must be a number greater than or equal to zero.

• Mass is the mass, and has the symbol m.

  The mass must be a number greater than or equal to zero.