Merging my code with jnphilipps code. Works.

(Task 1 .. 4 complete)
+ 2 Constants to create the outcome of the rendering
+ lots of comments (hope it will make things clear - use docs as reference)

note: in old branches the code was working but some computations like intersection or interpolation were not completely correct. with acceleration octree it works ... and it is fast :D
note2: don't think the octree works as a tree ... seems to be used as a list, tree only when building