implementing parenting

[patrick]

Implementing a new coordinating system via parenting. The idea is, that every object, every point in the world has a relative and an absoulte coordinate.

• relative coordinate: is defined relative to a parent
• absolute coordinate: is defined in absolute openGL coordinate space

The relative coordinates make up a tree, from a base parent NullParent all the other parents are derived from.
The source code will be writen into the files p_node.h and p_node.cc, the classes will be called PNode
There will be some HelperParent that will be used to make parents that have no direct use in the world.

[bensch]

Not yet finished.

what we need is:

• Rotation: aroud the parent if the parent rotates
• Simplicity: everything has to work out of the Box. The derived classes of p_node do only have to be parented, the rest is done by p_node
• One Sided:
  • either setParent or setChild
  • children/parents must be private (or at least protected) or errors occure
• have to talk about this matter @patrick & @bensch