Inter-object behaviour:
Proximity – distance between 2 class objects
Density – similar to cellular automata game of life transitions rules
Cluster – click to ‘pop’ connected object by type and proximity
Arbitrary interactions built between types – in this example the blue/white type gets ‘popped’ by high neighbouring density of red type

Key concepts:

Object:
Types – OOP Class variables

Made as a quick Unity3D demonstration in 2014
originally deployed for unity web player online
unity web player is no longer supported (see https://unity3d.com/webplayer)
http://www.pycheung.com/projects/wp-content/uploads/demoPicking

Made as a quick Unity3D demonstration for scripted and user interactions between objects