Upated readme

Added icons, fixed some ui bugs

Commented out scenekit shadows render

SceneKitRenderer runs but produces black texture.

Shadow pass via SCNRenderer drawing ARPlanes attempt but changing metal version to 2.4 in order to support function pointers in fragment shaders makes the conemarchFunction crash metal :(

Added some comments

Load PostFX w/ parameters from plist

optimized raymarch by setting max depth to the min of the world depth and the max raymarch depth.

readme

Updated readme

updated readme

Added license and moved readme to root

Added some distance fields and post fx

Lots of things

starting distance field abstraction

First commit ;)