Write methods are polymorphic, overridden by subclasses. There is a single operator<< for Objects that calls the right Write() method for the object. Neat.
- Remove Shape, because it seems to be mostly extra. All renderable objects now
derive from Object, rather than Shape
- Light (which inherited from Object before) now defines its own origin, but
this is coming in a later commit...
- Use charles namespace
- Use a std::vector<double> instead of float** to pass back intersection points.
This is kind of a biggie because it made the render process 50% slower :( I'll
have to work out why and maybe fix it...