Python value/reference/I don't even know
I've tried to implement the diamond-square algorithm in python, but I seem to be bogged down in the workings of the language... I have a 'quad' class that has 9 2D (custom) points inside it:

 - top left
 - top right
 - top middle
 - bottom left
 - bottom right
 - bottom middle
 - left middle
 - centre
 - right middle

These 9 are held in a dictionary.

There are also 4 'child' quads in a dictionary for every quad.

 - top left
 - top right
 - bottom left
 - bottom right

The problem I have is that when I create the child quads for a quad, they mess up the fields of the parent's 2D points, and I have no idea why.

Source code (Python 3.2): http://pastebin.com/5Ywz4anY
Python value/reference/I don't even know
===

I've tried to implement the diamond-square algorithm in python, but I seem to be bogged down in the workings of the language... I have a 'quad' class that has 9 2D (custom) points inside it:

 - top left
 - top right
 - top middle
 - bottom left
 - bottom right
 - bottom middle
 - left middle
 - centre
 - right middle

These 9 are held in a dictionary.

There are also 4 'child' quads in a dictionary for every quad.

 - top left
 - top right
 - bottom left
 - bottom right

The problem I have is that when I create the child quads for a quad, they mess up the fields of the parent's 2D points, and I have no idea why.

Source code (Python 3.2): http://pastebin.com/5Ywz4anY