Corrected a bug in the light model: the result of the hyperbolic function has to be scaled.

tanh(x) => (1 - tanh (x) ) / 2
Corrected a IDE specific comment.
Corrected an IDE specific comment.

Added a method to return the absolute orientation.
Added a function to write a light intensity map.
Merge branch 'vibe-heat' of https://github.com/plsm/assisi-playground into vibe-heat

Hitler merge?!