Allowed user to choose from one of two heightmaps with/without geometric optimisation
Removed incorrect cylinder intersection and added AABB-AABB intersection test to AABB class
Tweaked with Octree code to get it looking nice on scene
Added two new heightmaps and continued tweaking with the scene
Tweaked interface more and added switches for ligths
Added cancel button
Removed unused skybox texture
Wrote README
Tweaked with README, removed TODOs and found better amount per node in Octree
Fixed segmentation fault in program when no rendering occurred
Made it so images are always saved as PNG files and updated README to include another situation