Point3D -- the class of a point in a 3D space

Methods that use an object of class Point3D :

• pictureZone(Point3D) -- find the zone that contains the point
• segment(Point3D,Point3D) -- a line segment from two points
• sphere(Point3D,RR) -- a sphere from a center and a radius
• sphere(Point3D,ZZ) -- a sphere from a center and a radius
• textTag(Point3D,String) -- a text tag at a position

For the programmer

The object Point3D is a type, with ancestor classes GraphicPrimitive < BasicList < Thing.